Merge pull request #2 from AlexanderJGoldstein/simulations
Rewrote the top level verilog for a 30x30 array; moved the original
diff --git a/verilog/dv/chaos_test2/chaos_test2.c b/verilog/dv/chaos_test2/chaos_test2.c
index add7e5c..b48f9aa 100644
--- a/verilog/dv/chaos_test2/chaos_test2.c
+++ b/verilog/dv/chaos_test2/chaos_test2.c
@@ -35,7 +35,6 @@
#define reg_user_data1 (*(volatile uint32_t*)0x3000001c)
#define reg_user_data2 (*(volatile uint32_t*)0x30000020)
#define reg_user_data3 (*(volatile uint32_t*)0x30000024)
-#define reg_user_data4 (*(volatile uint32_t*)0x30000028)
/* Configuration further refined to each LUT (16 bits per LUT) */
#define reg_user_config_N (*(volatile uint16_t*)0x30000000)
diff --git a/verilog/dv/chaos_test3/chaos_test3.c b/verilog/dv/chaos_test3/chaos_test3.c
index f4445c3..de9ffa0 100644
--- a/verilog/dv/chaos_test3/chaos_test3.c
+++ b/verilog/dv/chaos_test3/chaos_test3.c
@@ -37,7 +37,6 @@
#define reg_user_data1 (*(volatile uint32_t*)0x3000001c)
#define reg_user_data2 (*(volatile uint32_t*)0x30000020)
#define reg_user_data3 (*(volatile uint32_t*)0x30000024)
-#define reg_user_data4 (*(volatile uint32_t*)0x30000028)
/* Configuration further refined to each LUT (16 bits per LUT) */
#define reg_user_config_N (*(volatile uint16_t*)0x30000000)
@@ -123,7 +122,6 @@
reg_user_data1 = 0;
reg_user_data2 = 0;
reg_user_data3 = 0;
- reg_user_data4 = 0;
// Apply address 0 (meaning shift by 1 address position each time)
reg_user_address = 0;
@@ -137,7 +135,8 @@
reg_user_config_W = 0xff00;
reg_user_config_E = 0xff00;
- for (i = 0; i < 1500; i++)
+ // Note: 900 = 30 x 30, or the total number of cells.
+ for (i = 0; i < 900; i++)
{
// Cycle register to load position
reg_user_transfer = 1;
@@ -164,21 +163,18 @@
reg_mprj_datal = reg_user_data1;
reg_mprj_datal = reg_user_data2;
reg_mprj_datal = reg_user_data3;
- reg_mprj_datal = reg_user_data4;
// Apply one bits to all inputs (with logic analyzer)
reg_user_data0 = -1;
reg_user_data1 = -1;
reg_user_data2 = -1;
reg_user_data3 = -1;
- reg_user_data4 = -1;
// Read bits from all outputs (should be one)---apply to GPIO out
reg_mprj_datal = reg_user_data0;
reg_mprj_datal = reg_user_data1;
reg_mprj_datal = reg_user_data2;
reg_mprj_datal = reg_user_data3;
- reg_mprj_datal = reg_user_data4;
// Flag end of test
reg_mprj_datal = 0xAB510000;
diff --git a/verilog/rtl/user_project_wrapper.v b/verilog/rtl/user_project_wrapper.v
index 09691b6..3098be5 100644
--- a/verilog/rtl/user_project_wrapper.v
+++ b/verilog/rtl/user_project_wrapper.v
@@ -99,9 +99,15 @@
* the cell address, (2) Apply the shift cycle, (3) Read the configuration
* data, (4) Apply the finish cycle.
*
- *
* This version uses the chaos_subarray, which is intended to be
* prehardened as a macro and tiled in the top level.
+ *
+ * The user project wrapper is currently hard-coded to a specific
+ * array size due to the complexity of aligning the array inputs and
+ * outputs to the GPIO pins. The original version of this wrapper
+ * was hard-coded to a 30x50 array, and has been copied back to
+ * user_project_wrapper_30x50.v. The current version is hard-coded
+ * to a 30x30 array.
*-------------------------------------------------------------
*/
@@ -117,7 +123,7 @@
module user_project_wrapper #(
parameter XSIZE = 30, // Total number of cells left to right
- parameter YSIZE = 50, // Total number of cells top to bottom
+ parameter YSIZE = 30, // Total number of cells top to bottom
parameter XTOP = 3, // Number of sub-arrays left to right
parameter YTOP = 5, // Number of sub-arrays top to bottom
parameter ASIZE = 11, // Enough bits to count XSIZE * YSIZE
@@ -208,8 +214,8 @@
wire source_sel;
// NOTE: This should be parameterized.
- // For the 50x30 array, there are 50+50+30+30 = 160 periphery bits =
- // 5 words of 32 bits. This is hard-coded for convenience. If the
+ // For the 30x30 array, there are 30+30+30+30 = 120 periphery bits =
+ // 4 words of 32 bits. This is hard-coded for convenience. If the
// array size changes, this needs to be changed as well. Needs to be
// converted to a "generate" block.
wire [4:0] data_sel;
@@ -292,12 +298,11 @@
assign direct_sel = (wbs_adr_i[7:2] == `DIRECT);
assign source_sel = (wbs_adr_i[7:2] == `SOURCE);
- // Hard-coded to 5 words; see note above
+ // Hard-coded to 4 words; see note above
assign data_sel[0] = (wbs_adr_i[7:2] == (`DATATOP + 0));
assign data_sel[1] = (wbs_adr_i[7:2] == (`DATATOP + 1));
assign data_sel[2] = (wbs_adr_i[7:2] == (`DATATOP + 2));
assign data_sel[3] = (wbs_adr_i[7:2] == (`DATATOP + 3));
- assign data_sel[4] = (wbs_adr_i[7:2] == (`DATATOP + 4));
assign valid = wbs_cyc_i && wbs_stb_i;
assign wbs_ack_o = ready;
@@ -389,235 +394,230 @@
// Define I/O input slices
// NOTE: This is hard-coded. There are 38 GPIOs. Assigning 32 of them
// (GPIO 37 to 6) to array inputs and outputs. These are arranged as
- // 10 on the sides and 6 on the top and bottom. These are further sub-
- // divided into 5 inputs and 5 outputs on the sides, and 3 inputs and
- // 3 outputs on top and bottom. Depending on the selection, these
- // can be injected into various places around the array.
+ // 8 on the sides and 8 on the top and bottom. Depending on the selection,
+ // these can be injected into various places around the array.
// Another note: It probably makes more sense to define vectors for
// io_in_east, io_in_north, etc., and align them in the direction of
// the arrays (high to low index is top to bottom, or right to left).
- assign gpio_east = // I/O 15 to 6
- (gpio_input_slice == 0) ? 50'b0 : // No pad input
+ assign gpio_east = // I/O 13 to 6
+ (gpio_input_slice == 0) ? 22'b0 : // No pad input
(gpio_input_slice == 1) ? // Distributed
- {2'b0, io_in[15], 4'b0, io_in[14], 4'b0, io_in[13],
- 4'b0, io_in[12], 4'b0, io_in[11], 4'b0, io_in[10],
- 4'b0, io_in[9], 4'b0, io_in[8], 4'b0, io_in[7],
- 4'b0, io_in[6], 2'b0} :
- (gpio_input_slice == 2) ? {40'b0, io_in[15:6]} : // Bottom shifted
- (gpio_input_slice == 3) ? {20'b0, io_in[15:6], 20'b0} : // Centered
- {io_in[15:6], 40'b0}; // Top shifted
+ {io_in[13], 3'b0, io_in[12], 3'b0, io_in[11], 3'b0,
+ io_in[10], 3'b0, io_in[9], 3'b0, io_in[8], 3'b0,
+ io_in[7], 3'b0, io_in[6], 1'b0} :
+ (gpio_input_slice == 2) ? {22'b0, io_in[15:6]} : // Bottom shifted
+ (gpio_input_slice == 3) ? {11'b0, io_in[15:6], 11'b0} : // Centered
+ {io_in[15:6], 22'b0}; // Top shifted
- assign gpio_north = // I/O 21 to 16
- (gpio_input_slice == 0) ? 30'b0 : // No pad input
+ assign gpio_north = // I/O 21 to 14
+ (gpio_input_slice == 0) ? 22'b0 : // No pad input
(gpio_input_slice == 1) ? // Distributed
- {2'b0, io_in[16], 4'b0, io_in[17], 4'b0, io_in[18],
- 4'b0, io_in[19], 4'b0, io_in[20], 4'b0, io_in[21], 2'b0} :
- (gpio_input_slice == 2) ? // Right shifted
- {14'b0, io_in[16], io_in[17], io_in[18], io_in[19],
- io_in[20], io_in[21]} :
- (gpio_input_slice == 3) ? // Centered
- {7'b0, io_in[16], io_in[17], io_in[18], io_in[19],
- io_in[20], io_in[21], 7'b0} :
- {io_in[16], io_in[17], io_in[18], io_in[19], io_in[20],
- io_in[21], 4'b0}; // Left shifted
+ {io_in[14], 3'b0, io_in[15], 3'b0, io_in[16], 3'b0,
+ io_in[17], 3'b0, io_in[18], 3'b0, io_in[19], 3'b0,
+ io_in[20], 3'b0, io_in[21], 1'b0} :
+ (gpio_input_slice == 2) ? // Right shifted
+ {22'b0, io_in[14], io_in[15], io_in[16], io_in[17],
+ io_in[18], io_in[19], io_in[20], io_in[21]} :
+ (gpio_input_slice == 3) ? // Centered
+ {11'b0, io_in[14], io_in[15], io_in[16], io_in[17],
+ io_in[18], io_in[19], io_in[20], io_in[21], 11'b0} :
+ {io_in[14], io_in[15], io_in[16], io_in[17], io_in[18],
+ io_in[19], io_in[20], io_in[21], 22'b0}; // Left shifted
- assign gpio_west = // I/O 22 to 31
- (gpio_input_slice == 0) ? 50'b0 : // No pad input
+ assign gpio_west = // I/O 22 to 29
+ (gpio_input_slice == 0) ? 22'b0 : // No pad input
(gpio_input_slice == 1) ? // Distributed
- {2'b0, io_in[22], 4'b0, io_in[23], 4'b0, io_in[24],
- 4'b0, io_in[25], 4'b0, io_in[26], 4'b0, io_in[27],
- 4'b0, io_in[28], 4'b0, io_in[29], 4'b0, io_in[30],
- 4'b0, io_in[31], 2'b0} :
- (gpio_input_slice == 2) ? // Bottom shifted
- {40'b0, io_in[22], io_in[23], io_in[24], io_in[25],
- io_in[26], io_in[27], io_in[28], io_in[29], io_in[31],
- io_in[31]} :
- (gpio_input_slice == 3) ? // Centered
- {20'b0, io_in[22], io_in[23], io_in[24], io_in[25],
- io_in[26], io_in[27], io_in[28], io_in[29], io_in[31],
- io_in[31], 20'b0} :
+ {io_in[22], 3'b0, io_in[23], 3'b0, io_in[24], 3'b0,
+ io_in[25], 3'b0, io_in[26], 3'b0, io_in[27], 3'b0,
+ io_in[28], 3'b0, io_in[29], 1'b0} :
+ (gpio_input_slice == 2) ? // Bottom shifted
+ {22'b0, io_in[22], io_in[23], io_in[24], io_in[25],
+ io_in[26], io_in[27], io_in[28], io_in[29]} :
+ (gpio_input_slice == 3) ? // Centered
+ {11'b0, io_in[22], io_in[23], io_in[24], io_in[25],
+ io_in[26], io_in[27], io_in[28], io_in[29], 11'b0} :
{io_in[22], io_in[23], io_in[24], io_in[25], io_in[26],
- io_in[27], io_in[28], io_in[29], io_in[31], io_in[31],
- 40'b0}; // Top shifted
+ io_in[27], io_in[28], io_in[29], 22'b0}; // Top shifted
- assign gpio_south = // I/O 32 to 37
- (gpio_input_slice == 0) ? 30'b0 : // No pad input
+ assign gpio_south = // I/O 30 to 37
+ (gpio_input_slice == 0) ? 22'b0 : // No pad input
(gpio_input_slice == 1) ? // Distributed
- {2'b0, io_in[37], 4'b0, io_in[36], 4'b0, io_in[35],
- 4'b0, io_in[34], 4'b0, io_in[33], 4'b0, io_in[32], 2'b0} :
- (gpio_input_slice == 2) ? {14'b0, io_in[37:32]} : // Right shifted
- (gpio_input_slice == 3) ? {7'b0, io_in[37:32], 7'b0} : // Centered
- {io_in[37:32], 14'b0}; // Left shifted
+ {io_in[37], 3'b0, io_in[36], 3'b0, io_in[35], 3'b0,
+ io_in[34], 3'b0, io_in[33], 3'b0, io_in[32], 3'b0,
+ io_in[31], 3'b0, io_in[30], 1'b0} :
+ (gpio_input_slice == 2) ? {22'b0, io_in[37:30]} : // Right shifted
+ (gpio_input_slice == 3) ? {11'b0, io_in[37:30], 11'b0} : // Centered
+ {io_in[37:30], 22'b0}; // Left shifted
// East side
assign io_out[6] =
- (gpio_output_slice == 0) ? data_out_east[2] : // Distributed
- (gpio_output_slice == 1) ? data_out_east[20] : // Center
- (gpio_output_slice == 2) ? data_out_east[40] : // Top
+ (gpio_output_slice == 0) ? data_out_east[0] : // Distributed
+ (gpio_output_slice == 1) ? data_out_east[11] : // Center
+ (gpio_output_slice == 2) ? data_out_east[22] : // Top
data_out_east[0]; // Bottom
assign io_out[7] =
- (gpio_output_slice == 0) ? data_out_east[7] : // Distributed
- (gpio_output_slice == 1) ? data_out_east[21] : // Center
- (gpio_output_slice == 2) ? data_out_east[41] : // Top
+ (gpio_output_slice == 0) ? data_out_east[4] : // Distributed
+ (gpio_output_slice == 1) ? data_out_east[12] : // Center
+ (gpio_output_slice == 2) ? data_out_east[23] : // Top
data_out_east[1]; // Bottom
assign io_out[8] =
- (gpio_output_slice == 0) ? data_out_east[12] : // Distributed
- (gpio_output_slice == 1) ? data_out_east[22] : // Center
- (gpio_output_slice == 2) ? data_out_east[42] : // Top
+ (gpio_output_slice == 0) ? data_out_east[8] : // Distributed
+ (gpio_output_slice == 1) ? data_out_east[13] : // Center
+ (gpio_output_slice == 2) ? data_out_east[24] : // Top
data_out_east[2]; // Bottom
assign io_out[9] =
- (gpio_output_slice == 0) ? data_out_east[17] : // Distributed
- (gpio_output_slice == 1) ? data_out_east[23] : // Center
- (gpio_output_slice == 2) ? data_out_east[43] : // Top
+ (gpio_output_slice == 0) ? data_out_east[12] : // Distributed
+ (gpio_output_slice == 1) ? data_out_east[14] : // Center
+ (gpio_output_slice == 2) ? data_out_east[25] : // Top
data_out_east[3]; // Bottom
assign io_out[10] =
- (gpio_output_slice == 0) ? data_out_east[22] : // Distributed
- (gpio_output_slice == 1) ? data_out_east[24] : // Center
- (gpio_output_slice == 2) ? data_out_east[44] : // Top
+ (gpio_output_slice == 0) ? data_out_east[16] : // Distributed
+ (gpio_output_slice == 1) ? data_out_east[15] : // Center
+ (gpio_output_slice == 2) ? data_out_east[26] : // Top
data_out_east[4]; // Bottom
assign io_out[11] =
- (gpio_output_slice == 0) ? data_out_east[27] : // Distributed
- (gpio_output_slice == 1) ? data_out_east[25] : // Center
- (gpio_output_slice == 2) ? data_out_east[45] : // Top
+ (gpio_output_slice == 0) ? data_out_east[20] : // Distributed
+ (gpio_output_slice == 1) ? data_out_east[16] : // Center
+ (gpio_output_slice == 2) ? data_out_east[27] : // Top
data_out_east[5]; // Bottom
assign io_out[12] =
- (gpio_output_slice == 0) ? data_out_east[32] : // Distributed
- (gpio_output_slice == 1) ? data_out_east[26] : // Center
- (gpio_output_slice == 2) ? data_out_east[46] : // Top
+ (gpio_output_slice == 0) ? data_out_east[24] : // Distributed
+ (gpio_output_slice == 1) ? data_out_east[17] : // Center
+ (gpio_output_slice == 2) ? data_out_east[28] : // Top
data_out_east[6]; // Bottom
assign io_out[13] =
- (gpio_output_slice == 0) ? data_out_east[37] : // Distributed
- (gpio_output_slice == 1) ? data_out_east[27] : // Center
- (gpio_output_slice == 2) ? data_out_east[47] : // Top
+ (gpio_output_slice == 0) ? data_out_east[28] : // Distributed
+ (gpio_output_slice == 1) ? data_out_east[18] : // Center
+ (gpio_output_slice == 2) ? data_out_east[29] : // Top
data_out_east[7]; // Bottom
- assign io_out[14] =
- (gpio_output_slice == 0) ? data_out_east[42] : // Distributed
- (gpio_output_slice == 1) ? data_out_east[28] : // Center
- (gpio_output_slice == 2) ? data_out_east[48] : // Top
- data_out_east[8]; // Bottom
- assign io_out[15] =
- (gpio_output_slice == 0) ? data_out_east[47] : // Distributed
- (gpio_output_slice == 1) ? data_out_east[29] : // Center
- (gpio_output_slice == 2) ? data_out_east[49] : // Top
- data_out_east[9]; // Bottom
// North side
+ assign io_out[14] =
+ (gpio_output_slice == 0) ? data_out_north[28] : // Distributed
+ (gpio_output_slice == 1) ? data_out_north[18] : // Center
+ (gpio_output_slice == 2) ? data_out_north[29] : // Top
+ data_out_north[7]; // Bottom
+ assign io_out[15] =
+ (gpio_output_slice == 0) ? data_out_north[24] : // Distributed
+ (gpio_output_slice == 1) ? data_out_north[17] : // Center
+ (gpio_output_slice == 2) ? data_out_north[28] : // Top
+ data_out_north[6]; // Bottom
assign io_out[16] =
- (gpio_output_slice == 0) ? data_out_north[27] : // Distributed
+ (gpio_output_slice == 0) ? data_out_north[20] : // Distributed
(gpio_output_slice == 1) ? data_out_north[16] : // Center
- (gpio_output_slice == 2) ? data_out_north[29] : // Right
+ (gpio_output_slice == 2) ? data_out_north[27] : // Right
data_out_north[5]; // Left
assign io_out[17] =
- (gpio_output_slice == 0) ? data_out_north[22] : // Distributed
+ (gpio_output_slice == 0) ? data_out_north[16] : // Distributed
(gpio_output_slice == 1) ? data_out_north[15] : // Center
- (gpio_output_slice == 2) ? data_out_north[28] : // Right
+ (gpio_output_slice == 2) ? data_out_north[26] : // Right
data_out_north[4]; // Left
assign io_out[18] =
- (gpio_output_slice == 0) ? data_out_north[17] : // Distributed
+ (gpio_output_slice == 0) ? data_out_north[12] : // Distributed
(gpio_output_slice == 1) ? data_out_north[14] : // Center
- (gpio_output_slice == 2) ? data_out_north[27] : // Right
+ (gpio_output_slice == 2) ? data_out_north[25] : // Right
data_out_north[3]; // Left
assign io_out[19] =
- (gpio_output_slice == 0) ? data_out_north[12] : // Distributed
+ (gpio_output_slice == 0) ? data_out_north[8] : // Distributed
(gpio_output_slice == 1) ? data_out_north[13] : // Center
- (gpio_output_slice == 2) ? data_out_north[26] : // Right
+ (gpio_output_slice == 2) ? data_out_north[24] : // Right
data_out_north[2]; // Left
assign io_out[20] =
- (gpio_output_slice == 0) ? data_out_north[7] : // Distributed
+ (gpio_output_slice == 0) ? data_out_north[4] : // Distributed
(gpio_output_slice == 1) ? data_out_north[12] : // Center
- (gpio_output_slice == 2) ? data_out_north[25] : // Right
+ (gpio_output_slice == 2) ? data_out_north[23] : // Right
data_out_north[1]; // Left
assign io_out[21] =
- (gpio_output_slice == 0) ? data_out_north[2] : // Distributed
+ (gpio_output_slice == 0) ? data_out_north[0] : // Distributed
(gpio_output_slice == 1) ? data_out_north[11] : // Center
- (gpio_output_slice == 2) ? data_out_north[24] : // Right
+ (gpio_output_slice == 2) ? data_out_north[22] : // Right
data_out_north[0]; // Left
// West side
assign io_out[22] =
- (gpio_output_slice == 0) ? data_out_west[47] : // Distributed
- (gpio_output_slice == 1) ? data_out_west[29] : // Center
- (gpio_output_slice == 2) ? data_out_west[49] : // Top
- data_out_east[9]; // Bottom
+ (gpio_output_slice == 0) ? data_out_west[28] : // Distributed
+ (gpio_output_slice == 1) ? data_out_west[18] : // Center
+ (gpio_output_slice == 2) ? data_out_west[29] : // Top
+ data_out_west[7]; // Bottom
assign io_out[23] =
- (gpio_output_slice == 0) ? data_out_west[42] : // Distributed
- (gpio_output_slice == 1) ? data_out_west[28] : // Center
- (gpio_output_slice == 2) ? data_out_west[48] : // Top
- data_out_east[8]; // Bottom
+ (gpio_output_slice == 0) ? data_out_west[24] : // Distributed
+ (gpio_output_slice == 1) ? data_out_west[17] : // Center
+ (gpio_output_slice == 2) ? data_out_west[28] : // Top
+ data_out_west[6]; // Bottom
assign io_out[24] =
- (gpio_output_slice == 0) ? data_out_west[37] : // Distributed
- (gpio_output_slice == 1) ? data_out_west[27] : // Center
- (gpio_output_slice == 2) ? data_out_west[47] : // Top
- data_out_east[7]; // Bottom
+ (gpio_output_slice == 0) ? data_out_west[20] : // Distributed
+ (gpio_output_slice == 1) ? data_out_west[16] : // Center
+ (gpio_output_slice == 2) ? data_out_west[27] : // Top
+ data_out_west[5]; // Bottom
assign io_out[25] =
- (gpio_output_slice == 0) ? data_out_west[32] : // Distributed
- (gpio_output_slice == 1) ? data_out_west[26] : // Center
- (gpio_output_slice == 2) ? data_out_west[46] : // Top
- data_out_east[6]; // Bottom
+ (gpio_output_slice == 0) ? data_out_west[16] : // Distributed
+ (gpio_output_slice == 1) ? data_out_west[15] : // Center
+ (gpio_output_slice == 2) ? data_out_west[26] : // Top
+ data_out_west[4]; // Bottom
assign io_out[26] =
- (gpio_output_slice == 0) ? data_out_west[27] : // Distributed
- (gpio_output_slice == 1) ? data_out_west[25] : // Center
- (gpio_output_slice == 2) ? data_out_west[45] : // Top
- data_out_east[5]; // Bottom
- assign io_out[27] =
- (gpio_output_slice == 0) ? data_out_west[22] : // Distributed
- (gpio_output_slice == 1) ? data_out_west[24] : // Center
- (gpio_output_slice == 2) ? data_out_west[44] : // Top
- data_out_east[4]; // Bottom
- assign io_out[28] =
- (gpio_output_slice == 0) ? data_out_west[17] : // Distributed
- (gpio_output_slice == 1) ? data_out_west[23] : // Center
- (gpio_output_slice == 2) ? data_out_west[43] : // Top
- data_out_east[3]; // Bottom
- assign io_out[29] =
(gpio_output_slice == 0) ? data_out_west[12] : // Distributed
- (gpio_output_slice == 1) ? data_out_west[22] : // Center
- (gpio_output_slice == 2) ? data_out_west[42] : // Top
- data_out_east[2]; // Bottom
- assign io_out[30] =
- (gpio_output_slice == 0) ? data_out_west[7] : // Distributed
- (gpio_output_slice == 1) ? data_out_west[21] : // Center
- (gpio_output_slice == 2) ? data_out_west[41] : // Top
- data_out_east[1]; // Bottom
- assign io_out[31] =
- (gpio_output_slice == 0) ? data_out_west[2] : // Distributed
- (gpio_output_slice == 1) ? data_out_west[20] : // Center
- (gpio_output_slice == 2) ? data_out_west[40] : // Top
- data_out_east[0]; // Bottom
+ (gpio_output_slice == 1) ? data_out_west[14] : // Center
+ (gpio_output_slice == 2) ? data_out_west[25] : // Top
+ data_out_west[3]; // Bottom
+ assign io_out[27] =
+ (gpio_output_slice == 0) ? data_out_west[8] : // Distributed
+ (gpio_output_slice == 1) ? data_out_west[13] : // Center
+ (gpio_output_slice == 2) ? data_out_west[24] : // Top
+ data_out_west[2]; // Bottom
+ assign io_out[28] =
+ (gpio_output_slice == 0) ? data_out_west[4] : // Distributed
+ (gpio_output_slice == 1) ? data_out_west[12] : // Center
+ (gpio_output_slice == 2) ? data_out_west[23] : // Top
+ data_out_west[1]; // Bottom
+ assign io_out[29] =
+ (gpio_output_slice == 0) ? data_out_west[0] : // Distributed
+ (gpio_output_slice == 1) ? data_out_west[11] : // Center
+ (gpio_output_slice == 2) ? data_out_west[22] : // Top
+ data_out_west[0]; // Bottom
// South side
- assign io_out[32] =
- (gpio_output_slice == 0) ? data_out_south[2] : // Distributed
+ assign io_out[30] =
+ (gpio_output_slice == 0) ? data_out_south[0] : // Distributed
(gpio_output_slice == 1) ? data_out_south[11] : // Center
- (gpio_output_slice == 2) ? data_out_south[24] : // Right
- data_out_north[0]; // Left
- assign io_out[33] =
- (gpio_output_slice == 0) ? data_out_south[7] : // Distributed
+ (gpio_output_slice == 2) ? data_out_south[22] : // Top
+ data_out_south[0]; // Bottom
+ assign io_out[31] =
+ (gpio_output_slice == 0) ? data_out_south[4] : // Distributed
(gpio_output_slice == 1) ? data_out_south[12] : // Center
- (gpio_output_slice == 2) ? data_out_south[25] : // Right
- data_out_north[1]; // Left
- assign io_out[34] =
- (gpio_output_slice == 0) ? data_out_south[12] : // Distributed
+ (gpio_output_slice == 2) ? data_out_south[23] : // Top
+ data_out_south[1]; // Bottom
+ assign io_out[32] =
+ (gpio_output_slice == 0) ? data_out_south[8] : // Distributed
(gpio_output_slice == 1) ? data_out_south[13] : // Center
- (gpio_output_slice == 2) ? data_out_south[26] : // Right
- data_out_north[2]; // Left
- assign io_out[35] =
- (gpio_output_slice == 0) ? data_out_south[17] : // Distributed
+ (gpio_output_slice == 2) ? data_out_south[24] : // Right
+ data_out_south[2]; // Left
+ assign io_out[33] =
+ (gpio_output_slice == 0) ? data_out_south[12] : // Distributed
(gpio_output_slice == 1) ? data_out_south[14] : // Center
- (gpio_output_slice == 2) ? data_out_south[27] : // Right
- data_out_north[3]; // Left
- assign io_out[36] =
- (gpio_output_slice == 0) ? data_out_south[22] : // Distributed
+ (gpio_output_slice == 2) ? data_out_south[25] : // Right
+ data_out_south[3]; // Left
+ assign io_out[34] =
+ (gpio_output_slice == 0) ? data_out_south[16] : // Distributed
(gpio_output_slice == 1) ? data_out_south[15] : // Center
- (gpio_output_slice == 2) ? data_out_south[28] : // Right
- data_out_north[4]; // Left
- assign io_out[37] =
- (gpio_output_slice == 0) ? data_out_south[27] : // Distributed
+ (gpio_output_slice == 2) ? data_out_south[26] : // Right
+ data_out_south[4]; // Left
+ assign io_out[35] =
+ (gpio_output_slice == 0) ? data_out_south[20] : // Distributed
(gpio_output_slice == 1) ? data_out_south[16] : // Center
+ (gpio_output_slice == 2) ? data_out_south[27] : // Right
+ data_out_south[5]; // Left
+ assign io_out[36] =
+ (gpio_output_slice == 0) ? data_out_south[24] : // Distributed
+ (gpio_output_slice == 1) ? data_out_south[17] : // Center
+ (gpio_output_slice == 2) ? data_out_south[28] : // Right
+ data_out_south[6]; // Left
+ assign io_out[37] =
+ (gpio_output_slice == 0) ? data_out_south[28] : // Distributed
+ (gpio_output_slice == 1) ? data_out_south[18] : // Center
(gpio_output_slice == 2) ? data_out_south[29] : // Right
- data_out_north[5]; // Left
+ data_out_south[7]; // Left
// Map the output data from the sides to a single array that can be
// broken up into 32 bit segments for data transfer.
@@ -651,9 +651,7 @@
end else if (data_sel[2]) begin
rdata_pre = data_out[95:64];
end else if (data_sel[3]) begin
- rdata_pre = data_out[127:96];
- end else if (data_sel[4]) begin
- rdata_pre = data_out[159:128];
+ rdata_pre = {8'b0, data_out[119:96]};
end
end
@@ -756,12 +754,6 @@
if (iomem_we[0]) latched_in[103:96] <= wbs_dat_i[7:0];
if (iomem_we[1]) latched_in[111:104] <= wbs_dat_i[15:8];
if (iomem_we[2]) latched_in[119:112] <= wbs_dat_i[23:16];
- if (iomem_we[3]) latched_in[127:120] <= wbs_dat_i[31:24];
- end else if (data_sel[4]) begin
- if (iomem_we[0]) latched_in[135:128] <= wbs_dat_i[7:0];
- if (iomem_we[1]) latched_in[143:136] <= wbs_dat_i[15:8];
- if (iomem_we[2]) latched_in[151:144] <= wbs_dat_i[23:16];
- if (iomem_we[3]) latched_in[159:152] <= wbs_dat_i[31:24];
end
end else begin
xfer_ctrl <= 0; // Immediately self-resetting
diff --git a/verilog/rtl/user_project_wrapper_30x50.v b/verilog/rtl/user_project_wrapper_30x50.v
new file mode 100644
index 0000000..2b40284
--- /dev/null
+++ b/verilog/rtl/user_project_wrapper_30x50.v
@@ -0,0 +1,1009 @@
+// SPDX-FileCopyrightText: 2020 Efabless Corporation
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+// SPDX-License-Identifier: Apache-2.0
+
+`default_nettype none
+/*
+ *-------------------------------------------------------------
+ *
+ * chaos_automaton
+ *
+ * This chip is a pure asynchronous cellular automaton. Each cell has
+ * four inputs from N, S, E, W and generates four outputs to N, S, E, W.
+ * Each output can be configured for any boolean function of the four
+ * inputs (16 bits each).
+ *
+ * Outputs on the periphery (or some selection thereof) are passed to the
+ * chip GPIO. Inputs may also come from the chip periphery; choice of
+ * input or output is programmable like the cell boolean function.
+ *
+ * All periphery inputs and outputs may be channeled through the logic
+ * analyzer to apply input to or monitor output from the array.
+ *
+ * The wishbone bus may be used to program the cell functions.
+ *
+ * This can be used in a loop with an evolutionary algorithm to tune the
+ * chip functions to achieve a specific behavior.
+ *
+ * Most of the core circuitry is straightforward. The total number of
+ * cells is parameterized, so that the largest number of cells that will
+ * fit in the caravel user project space can be determined.
+ *
+ * Version v1: To avoid massive amounts of wiring (e.g., 16 or 32
+ * data wires + 10 address wires to every single cell), all of the
+ * LUT configuration memory is stored in a (very long) serial chain
+ * in a full loop. The scan chain is 64 bits longer than the number
+ * of cells and allows 64 bits to be transferred to and from the
+ * wishbone bus independently of the cells. Every cell has 64 latches
+ * in addition to the 64 flops so that the scan chain can be cycled
+ * without affecting ongoing operation of the automaton.
+ *
+ * Version v2: The logic analyzer is replaced by a local version that
+ * has the same number of bits as periphery I/O. There are two registers
+ * per signal, one for output, and one for input. All registers update
+ * simultaneously. Every periphery input is connected to three sources,
+ * XOR'd together: A periphery output, a GPIO input, and a register.
+ * Every periphery output is connected to three sinks: A periphery
+ * input, a GPIO output, and a register. The periphery output-to-input
+ * connections can be a loop-back or neighbor loop-back.
+ *
+ * Memory mapped address space:
+ *
+ * BASE_ADR + 7 to BASE_ADR + 0: Configuration data to read or write
+ * BASE_ADR + 11 to BASE_ADR + 8: Core cell address for read/write
+ * BASE_ADR + 12: Triggers
+ * BASE_ADR + 17 to BASE_ADR + 16: Per-side input configuration
+ * BASE_ADR + 18: GPIO input and output slice selection
+ * BASE_ADR + 19: GPIO direction
+ * BASE_ADR + ?? to BASE_ADR + 20: Operational data
+ * (BASE_ADR + 39 for 50x30 array)
+ *
+ * Trigger bits:
+ * bit 0: Shift by (address) cells (64 bits).
+ * bit 1: Finish cycle. Return shift register to run state, toggle "hold"
+ *
+ * (to be done:)
+ * bit 2: Capture data
+ * bit 3: Apply data
+ *
+ * All trigger bits are self-resetting. The trigger bit (as read) remains
+ * high until the transfer has completed. The trigger bit can be polled to
+ * determine when the cycle has completed.
+ *
+ * The shift cycle bit can be used to load the configuration of the array
+ * cell by cell. The typical case is to set address = 1 and apply or read
+ * each cell's configuration in turn. However, it can also be used piecemeal,
+ * for example, to read out a block of configurations, without having
+ * to loop a full cycle for each one. The counter tracks what the
+ * current offset is, and can return to the run-state position on
+ * application of bit 1, "Finish cycle". At the end of "Finish cycle"
+ * the hold bit is toggled to latch and apply any new configuration
+ * data.
+ *
+ * Reading and writing a single cell's configuration can be accomplished
+ * by a sequence of shift cycles and reads/writes. To change the
+ * configuration of a single cell: (1) Write the cell address, (2) Apply
+ * the shift cycle, (3) Write the configuration data, (4) Apply the
+ * finish cycle. To read the configuration of a single cell: (1) Write
+ * the cell address, (2) Apply the shift cycle, (3) Read the configuration
+ * data, (4) Apply the finish cycle.
+ *
+ *
+ * This version uses the chaos_subarray, which is intended to be
+ * prehardened as a macro and tiled in the top level.
+ *-------------------------------------------------------------
+ */
+
+// NOTE: Uncomment the following lines for syntax checking
+// `define MPRJ_IO_PADS 38
+// `include "chaos_subarray.v"
+
+/*
+ *-----------------------------------------------------------------
+ * User project top level
+ *-----------------------------------------------------------------
+ */
+
+module user_project_wrapper #(
+ parameter XSIZE = 30, // Total number of cells left to right
+ parameter YSIZE = 50, // Total number of cells top to bottom
+ parameter XTOP = 3, // Number of sub-arrays left to right
+ parameter YTOP = 5, // Number of sub-arrays top to bottom
+ parameter ASIZE = 11, // Enough bits to count XSIZE * YSIZE
+ parameter BASE_ADR = 32'h 3000_0000 // Wishbone base address
+)(
+`ifdef USE_POWER_PINS
+ inout vdda1, // User area 1 3.3V supply
+ inout vdda2, // User area 2 3.3V supply
+ inout vssa1, // User area 1 analog ground
+ inout vssa2, // User area 2 analog ground
+ inout vccd1, // User area 1 1.8V supply
+ inout vccd2, // User area 2 1.8v supply
+ inout vssd1, // User area 1 digital ground
+ inout vssd2, // User area 2 digital ground
+`endif
+
+ // Wishbone Slave ports (WB MI A)
+ input wb_clk_i,
+ input wb_rst_i,
+ input wbs_stb_i,
+ input wbs_cyc_i,
+ input wbs_we_i,
+ input [3:0] wbs_sel_i,
+ input [31:0] wbs_dat_i,
+ input [31:0] wbs_adr_i,
+ output wbs_ack_o,
+ output [31:0] wbs_dat_o,
+
+ // Logic Analyzer Signals (unused)
+ input [127:0] la_data_in,
+ output [127:0] la_data_out,
+ input [127:0] la_oenb,
+
+ // IOs
+ input [`MPRJ_IO_PADS-1:0] io_in,
+ output [`MPRJ_IO_PADS-1:0] io_out,
+ output [`MPRJ_IO_PADS-1:0] io_oeb,
+
+ // Analog (direct connection to GPIO pad---use with caution)
+ // Note that analog I/O is not available on the 7 lowest-numbered
+ // GPIO pads, and so the analog_io indexing is offset from the
+ // GPIO indexing by 7 (also upper 2 GPIOs do not have analog_io).
+ inout [`MPRJ_IO_PADS-10:0] analog_io,
+
+ // Independent clock
+ input user_clock2,
+
+ // IRQ
+ output [2:0] user_irq
+);
+
+`define IDLE 3'b000
+`define START 3'b001
+`define FINISH 3'b010
+`define XDATAS 3'b011
+`define XDATAF 3'b100
+`define LOAD 3'b101
+
+`define CONFIGL 8'h00 /* Address offset of configuration data low word */
+`define CONFIGH 8'h01 /* Address offset of configuration data high word */
+`define ADDRESS 8'h02 /* Address offset of cell address value */
+`define XFER 8'h03 /* Address offset of transfer bits */
+`define DIRECT 8'h04 /* Address offset of GPIO directions */
+`define SOURCE 8'h05 /* Address offset of GPIO source selection */
+`define DATATOP 8'h06 /* Address offset of start of data section */
+
+`define MAXADDR (XSIZE * YSIZE) /* Highest cell address plus one */
+
+ reg clk; /* serial clock to transfer data */
+ reg hold; /* trigger to hold transferred data */
+ reg [2:0] xfer_state; /* state of the data transfer */
+ reg [1:0] xfer_ctrl; /* Configuration transfer trigger bits */
+ reg [63:0] config_data; /* 64 bits to read or write configuration */
+ reg local_reset; /* Reset applied from a register */
+
+ reg [ASIZE - 1:0] cell_addr; /* Core cell to address */
+ reg [ASIZE - 1:0] cell_offset; /* Current offset of shift register */
+ reg [ASIZE + 6:0] bit_count; /* Full count (cell address + bits) */
+
+ wire [`MPRJ_IO_PADS-1:0] io_in;
+ wire [`MPRJ_IO_PADS-1:0] io_out;
+ wire [`MPRJ_IO_PADS-1:0] io_oeb;
+
+ wire [1:0] config_sel;
+ wire address_sel;
+ wire xfer_sel;
+ wire direct_sel;
+ wire source_sel;
+
+ // NOTE: This should be parameterized.
+ // For the 50x30 array, there are 50+50+30+30 = 160 periphery bits =
+ // 5 words of 32 bits. This is hard-coded for convenience. If the
+ // array size changes, this needs to be changed as well. Needs to be
+ // converted to a "generate" block.
+ wire [4:0] data_sel;
+
+ wire valid;
+ reg ready;
+ wire [3:0] iomem_we;
+ wire selected;
+ wire [1:0] busy;
+ reg [31:0] rdata_pre;
+ wire [63:0] rdata;
+ reg [31:0] wbs_dat_o;
+ reg [63:0] wdata;
+ reg write;
+ wire all_cell_reset;
+
+ // Direction for each GPIO (32 used)
+ reg [31:0] gpio_oeb;
+
+ // Data to and from array periphery I/O
+ wire [YSIZE-1: 0] data_in_east;
+ wire [YSIZE-1: 0] data_in_west;
+ wire [XSIZE-1: 0] data_in_north;
+ wire [XSIZE-1: 0] data_in_south;
+
+ wire [YSIZE-1: 0] data_out_east;
+ wire [YSIZE-1: 0] data_out_west;
+ wire [XSIZE-1: 0] data_out_north;
+ wire [XSIZE-1: 0] data_out_south;
+
+ // Latched output for wishbone read-back (to be done)
+ // TBD
+
+ // Latched input from wishbone (to do: Make shadow register)
+ wire [YSIZE-1: 0] latched_in_east;
+ wire [YSIZE-1: 0] latched_in_west;
+ wire [XSIZE-1: 0] latched_in_north;
+ wire [XSIZE-1: 0] latched_in_south;
+
+ // Shadow registers for wishbone input (to be done)
+ // TBD
+
+ // Register array mapping latched data to 32-bit sections for data
+ // transfer through the wishbone
+ reg [XSIZE*2 + YSIZE*2 - 1:0] latched_in;
+
+ // Wire array mapping output data to 32-bit sections for data
+ // transfer through the wishbone
+ wire [XSIZE*2 + YSIZE*2 - 1:0] data_out;
+
+ // Periphery output-to-input loop-back selection
+ reg [2:0] north_loopback;
+ reg [2:0] east_loopback;
+ reg [2:0] south_loopback;
+ reg [2:0] west_loopback;
+
+// Loopback value definitions
+
+`define INPUT_LOW 3'b000
+`define INPUT_HIGH 3'b001
+`define LOOPBACK 3'b010
+`define NEIGHBOR_LEFT 3'b011
+`define NEIGHBOR_RIGHT 3'b100
+
+ // GPIO slicing (because there are many fewer GPIO than array outputs)
+ // GPIOs can be clustered on either end or in the center of the array
+ // side, or distributed along the side (1 GPIO per 5 array cells)
+ reg [1:0] gpio_output_slice;
+ reg [2:0] gpio_input_slice;
+
+ // Registered GPIO directions go directly to io_oeb[37:6]. Leave the
+ // lower 6 GPIO to the management processor.
+ assign io_oeb = {gpio_oeb, 6'b1};
+
+ // Wishbone address select indicators
+ assign config_sel[0] = (wbs_adr_i[7:2] == `CONFIGL);
+ assign config_sel[1] = (wbs_adr_i[7:2] == `CONFIGH);
+ assign address_sel = (wbs_adr_i[7:2] == `ADDRESS);
+ assign xfer_sel = (wbs_adr_i[7:2] == `XFER);
+ assign direct_sel = (wbs_adr_i[7:2] == `DIRECT);
+ assign source_sel = (wbs_adr_i[7:2] == `SOURCE);
+
+ // Hard-coded to 5 words; see note above
+ assign data_sel[0] = (wbs_adr_i[7:2] == (`DATATOP + 0));
+ assign data_sel[1] = (wbs_adr_i[7:2] == (`DATATOP + 1));
+ assign data_sel[2] = (wbs_adr_i[7:2] == (`DATATOP + 2));
+ assign data_sel[3] = (wbs_adr_i[7:2] == (`DATATOP + 3));
+ assign data_sel[4] = (wbs_adr_i[7:2] == (`DATATOP + 4));
+
+ assign valid = wbs_cyc_i && wbs_stb_i;
+ assign wbs_ack_o = ready;
+ assign iomem_we = wbs_sel_i & {4{wbs_we_i}};
+
+ assign all_cell_reset = wb_rst_i | local_reset;
+
+ // IRQ
+ assign user_irq = 3'b000; // Unused
+
+ // Instantiate the chaos cell array
+
+ chaos_array #(
+ .XSIZE(XSIZE),
+ .YSIZE(YSIZE),
+ .XTOP(XTOP),
+ .YTOP(YTOP),
+ .BASE_ADR(BASE_ADR)
+ ) chaos_array_inst (
+ `ifdef USE_POWER_PINS
+ .vccd1(vccd1),
+ .vssd1(vssd1),
+ `endif
+ .clk(clk),
+ .reset(all_cell_reset),
+ .hold(hold),
+ .rdata(rdata),
+ .wdata(wdata),
+ .write(write),
+ .data_in_east(data_in_east),
+ .data_in_west(data_in_west),
+ .data_in_north(data_in_north),
+ .data_in_south(data_in_south),
+ .data_out_east(data_out_east),
+ .data_out_west(data_out_west),
+ .data_out_north(data_out_north),
+ .data_out_south(data_out_south)
+ );
+
+ // Wire definitions mapping the GPIO to the array periphery
+ wire [YSIZE-1:0] gpio_east, gpio_west;
+ wire [XSIZE-1:0] gpio_north, gpio_south;
+
+ // Wire definitions mapping the array periphery loop-back connections
+ wire [YSIZE-1:0] data_muxed_east, data_muxed_west;
+ wire [XSIZE-1:0] data_muxed_north, data_muxed_south;
+
+ // Hook up array inputs (data_in_*) to an XOR'd combination of
+ // (1) array outputs (data_out_*, muxed into data_muxed_*),
+ // (2) the GPIO pads (muxed into gpio_*), and
+ // (3) data from the wishbone bus (latched_in_*).
+
+ assign data_in_west = latched_in_west ^ gpio_west ^ data_muxed_west;
+ assign data_in_east = latched_in_east ^ gpio_east ^ data_muxed_east;
+ assign data_in_south = latched_in_south ^ gpio_south ^ data_muxed_south;
+ assign data_in_north = latched_in_north ^ gpio_north ^ data_muxed_north;
+
+`define INPUT_LOW 3'b000
+`define INPUT_HIGH 3'b001
+`define LOOPBACK 3'b010
+`define NEIGHBOR_LEFT 3'b011
+`define NEIGHBOR_RIGHT 3'b100
+
+ // Define loop-back inputs
+ assign data_muxed_west =
+ (west_loopback == `NEIGHBOR_LEFT) ? {data_out_west[YSIZE-2:0], 1'b0} :
+ (west_loopback == `NEIGHBOR_RIGHT) ? {1'b0, data_out_west[YSIZE-1:1]} :
+ (west_loopback == `LOOPBACK) ? data_out_west :
+ (west_loopback == `INPUT_HIGH) ? 'b1 : 'b0;
+
+ assign data_muxed_east =
+ (east_loopback == `NEIGHBOR_LEFT) ? {data_out_east[YSIZE-2:0], 1'b0} :
+ (east_loopback == `NEIGHBOR_RIGHT) ? {1'b0, data_out_east[YSIZE-1:1]} :
+ (east_loopback == `LOOPBACK) ? data_out_east :
+ (east_loopback == `INPUT_HIGH) ? 'b1 : 'b0;
+
+ assign data_muxed_south =
+ (south_loopback == `NEIGHBOR_LEFT) ? {data_out_south[XSIZE-2:0], 1'b0} :
+ (south_loopback == `NEIGHBOR_RIGHT) ? {1'b0, data_out_south[XSIZE-1:1]} :
+ (south_loopback == `LOOPBACK) ? data_out_south :
+ (south_loopback == `INPUT_HIGH) ? 'b1 : 'b0;
+
+ assign data_muxed_north =
+ (north_loopback == `NEIGHBOR_LEFT) ? {data_out_north[XSIZE-2:0], 1'b0} :
+ (north_loopback == `NEIGHBOR_RIGHT) ? {1'b0, data_out_north[XSIZE-1:1]} :
+ (north_loopback == `LOOPBACK) ? data_out_north :
+ (south_loopback == `INPUT_HIGH) ? 'b1 : 'b0;
+
+ // Define I/O input slices
+ // NOTE: This is hard-coded. There are 38 GPIOs. Assigning 32 of them
+ // (GPIO 37 to 6) to array inputs and outputs. These are arranged as
+ // 10 on the sides and 6 on the top and bottom. These are further sub-
+ // divided into 5 inputs and 5 outputs on the sides, and 3 inputs and
+ // 3 outputs on top and bottom. Depending on the selection, these
+ // can be injected into various places around the array.
+
+ // Another note: It probably makes more sense to define vectors for
+ // io_in_east, io_in_north, etc., and align them in the direction of
+ // the arrays (high to low index is top to bottom, or right to left).
+
+ assign gpio_east = // I/O 15 to 6
+ (gpio_input_slice == 0) ? 50'b0 : // No pad input
+ (gpio_input_slice == 1) ? // Distributed
+ {2'b0, io_in[15], 4'b0, io_in[14], 4'b0, io_in[13],
+ 4'b0, io_in[12], 4'b0, io_in[11], 4'b0, io_in[10],
+ 4'b0, io_in[9], 4'b0, io_in[8], 4'b0, io_in[7],
+ 4'b0, io_in[6], 2'b0} :
+ (gpio_input_slice == 2) ? {40'b0, io_in[15:6]} : // Bottom shifted
+ (gpio_input_slice == 3) ? {20'b0, io_in[15:6], 20'b0} : // Centered
+ {io_in[15:6], 40'b0}; // Top shifted
+
+ assign gpio_north = // I/O 21 to 16
+ (gpio_input_slice == 0) ? 30'b0 : // No pad input
+ (gpio_input_slice == 1) ? // Distributed
+ {2'b0, io_in[16], 4'b0, io_in[17], 4'b0, io_in[18],
+ 4'b0, io_in[19], 4'b0, io_in[20], 4'b0, io_in[21], 2'b0} :
+ (gpio_input_slice == 2) ? // Right shifted
+ {14'b0, io_in[16], io_in[17], io_in[18], io_in[19],
+ io_in[20], io_in[21]} :
+ (gpio_input_slice == 3) ? // Centered
+ {7'b0, io_in[16], io_in[17], io_in[18], io_in[19],
+ io_in[20], io_in[21], 7'b0} :
+ {io_in[16], io_in[17], io_in[18], io_in[19], io_in[20],
+ io_in[21], 4'b0}; // Left shifted
+
+ assign gpio_west = // I/O 22 to 31
+ (gpio_input_slice == 0) ? 50'b0 : // No pad input
+ (gpio_input_slice == 1) ? // Distributed
+ {2'b0, io_in[22], 4'b0, io_in[23], 4'b0, io_in[24],
+ 4'b0, io_in[25], 4'b0, io_in[26], 4'b0, io_in[27],
+ 4'b0, io_in[28], 4'b0, io_in[29], 4'b0, io_in[30],
+ 4'b0, io_in[31], 2'b0} :
+ (gpio_input_slice == 2) ? // Bottom shifted
+ {40'b0, io_in[22], io_in[23], io_in[24], io_in[25],
+ io_in[26], io_in[27], io_in[28], io_in[29], io_in[31],
+ io_in[31]} :
+ (gpio_input_slice == 3) ? // Centered
+ {20'b0, io_in[22], io_in[23], io_in[24], io_in[25],
+ io_in[26], io_in[27], io_in[28], io_in[29], io_in[31],
+ io_in[31], 20'b0} :
+ {io_in[22], io_in[23], io_in[24], io_in[25], io_in[26],
+ io_in[27], io_in[28], io_in[29], io_in[31], io_in[31],
+ 40'b0}; // Top shifted
+
+ assign gpio_south = // I/O 32 to 37
+ (gpio_input_slice == 0) ? 30'b0 : // No pad input
+ (gpio_input_slice == 1) ? // Distributed
+ {2'b0, io_in[37], 4'b0, io_in[36], 4'b0, io_in[35],
+ 4'b0, io_in[34], 4'b0, io_in[33], 4'b0, io_in[32], 2'b0} :
+ (gpio_input_slice == 2) ? {14'b0, io_in[37:32]} : // Right shifted
+ (gpio_input_slice == 3) ? {7'b0, io_in[37:32], 7'b0} : // Centered
+ {io_in[37:32], 14'b0}; // Left shifted
+
+ // East side
+ assign io_out[6] =
+ (gpio_output_slice == 0) ? data_out_east[2] : // Distributed
+ (gpio_output_slice == 1) ? data_out_east[20] : // Center
+ (gpio_output_slice == 2) ? data_out_east[40] : // Top
+ data_out_east[0]; // Bottom
+ assign io_out[7] =
+ (gpio_output_slice == 0) ? data_out_east[7] : // Distributed
+ (gpio_output_slice == 1) ? data_out_east[21] : // Center
+ (gpio_output_slice == 2) ? data_out_east[41] : // Top
+ data_out_east[1]; // Bottom
+ assign io_out[8] =
+ (gpio_output_slice == 0) ? data_out_east[12] : // Distributed
+ (gpio_output_slice == 1) ? data_out_east[22] : // Center
+ (gpio_output_slice == 2) ? data_out_east[42] : // Top
+ data_out_east[2]; // Bottom
+ assign io_out[9] =
+ (gpio_output_slice == 0) ? data_out_east[17] : // Distributed
+ (gpio_output_slice == 1) ? data_out_east[23] : // Center
+ (gpio_output_slice == 2) ? data_out_east[43] : // Top
+ data_out_east[3]; // Bottom
+ assign io_out[10] =
+ (gpio_output_slice == 0) ? data_out_east[22] : // Distributed
+ (gpio_output_slice == 1) ? data_out_east[24] : // Center
+ (gpio_output_slice == 2) ? data_out_east[44] : // Top
+ data_out_east[4]; // Bottom
+ assign io_out[11] =
+ (gpio_output_slice == 0) ? data_out_east[27] : // Distributed
+ (gpio_output_slice == 1) ? data_out_east[25] : // Center
+ (gpio_output_slice == 2) ? data_out_east[45] : // Top
+ data_out_east[5]; // Bottom
+ assign io_out[12] =
+ (gpio_output_slice == 0) ? data_out_east[32] : // Distributed
+ (gpio_output_slice == 1) ? data_out_east[26] : // Center
+ (gpio_output_slice == 2) ? data_out_east[46] : // Top
+ data_out_east[6]; // Bottom
+ assign io_out[13] =
+ (gpio_output_slice == 0) ? data_out_east[37] : // Distributed
+ (gpio_output_slice == 1) ? data_out_east[27] : // Center
+ (gpio_output_slice == 2) ? data_out_east[47] : // Top
+ data_out_east[7]; // Bottom
+ assign io_out[14] =
+ (gpio_output_slice == 0) ? data_out_east[42] : // Distributed
+ (gpio_output_slice == 1) ? data_out_east[28] : // Center
+ (gpio_output_slice == 2) ? data_out_east[48] : // Top
+ data_out_east[8]; // Bottom
+ assign io_out[15] =
+ (gpio_output_slice == 0) ? data_out_east[47] : // Distributed
+ (gpio_output_slice == 1) ? data_out_east[29] : // Center
+ (gpio_output_slice == 2) ? data_out_east[49] : // Top
+ data_out_east[9]; // Bottom
+
+ // North side
+ assign io_out[16] =
+ (gpio_output_slice == 0) ? data_out_north[27] : // Distributed
+ (gpio_output_slice == 1) ? data_out_north[16] : // Center
+ (gpio_output_slice == 2) ? data_out_north[29] : // Right
+ data_out_north[5]; // Left
+ assign io_out[17] =
+ (gpio_output_slice == 0) ? data_out_north[22] : // Distributed
+ (gpio_output_slice == 1) ? data_out_north[15] : // Center
+ (gpio_output_slice == 2) ? data_out_north[28] : // Right
+ data_out_north[4]; // Left
+ assign io_out[18] =
+ (gpio_output_slice == 0) ? data_out_north[17] : // Distributed
+ (gpio_output_slice == 1) ? data_out_north[14] : // Center
+ (gpio_output_slice == 2) ? data_out_north[27] : // Right
+ data_out_north[3]; // Left
+ assign io_out[19] =
+ (gpio_output_slice == 0) ? data_out_north[12] : // Distributed
+ (gpio_output_slice == 1) ? data_out_north[13] : // Center
+ (gpio_output_slice == 2) ? data_out_north[26] : // Right
+ data_out_north[2]; // Left
+ assign io_out[20] =
+ (gpio_output_slice == 0) ? data_out_north[7] : // Distributed
+ (gpio_output_slice == 1) ? data_out_north[12] : // Center
+ (gpio_output_slice == 2) ? data_out_north[25] : // Right
+ data_out_north[1]; // Left
+ assign io_out[21] =
+ (gpio_output_slice == 0) ? data_out_north[2] : // Distributed
+ (gpio_output_slice == 1) ? data_out_north[11] : // Center
+ (gpio_output_slice == 2) ? data_out_north[24] : // Right
+ data_out_north[0]; // Left
+
+ // West side
+ assign io_out[22] =
+ (gpio_output_slice == 0) ? data_out_west[47] : // Distributed
+ (gpio_output_slice == 1) ? data_out_west[29] : // Center
+ (gpio_output_slice == 2) ? data_out_west[49] : // Top
+ data_out_west[9]; // Bottom
+ assign io_out[23] =
+ (gpio_output_slice == 0) ? data_out_west[42] : // Distributed
+ (gpio_output_slice == 1) ? data_out_west[28] : // Center
+ (gpio_output_slice == 2) ? data_out_west[48] : // Top
+ data_out_west[8]; // Bottom
+ assign io_out[24] =
+ (gpio_output_slice == 0) ? data_out_west[37] : // Distributed
+ (gpio_output_slice == 1) ? data_out_west[27] : // Center
+ (gpio_output_slice == 2) ? data_out_west[47] : // Top
+ data_out_west[7]; // Bottom
+ assign io_out[25] =
+ (gpio_output_slice == 0) ? data_out_west[32] : // Distributed
+ (gpio_output_slice == 1) ? data_out_west[26] : // Center
+ (gpio_output_slice == 2) ? data_out_west[46] : // Top
+ data_out_west[6]; // Bottom
+ assign io_out[26] =
+ (gpio_output_slice == 0) ? data_out_west[27] : // Distributed
+ (gpio_output_slice == 1) ? data_out_west[25] : // Center
+ (gpio_output_slice == 2) ? data_out_west[45] : // Top
+ data_out_west[5]; // Bottom
+ assign io_out[27] =
+ (gpio_output_slice == 0) ? data_out_west[22] : // Distributed
+ (gpio_output_slice == 1) ? data_out_west[24] : // Center
+ (gpio_output_slice == 2) ? data_out_west[44] : // Top
+ data_out_west[4]; // Bottom
+ assign io_out[28] =
+ (gpio_output_slice == 0) ? data_out_west[17] : // Distributed
+ (gpio_output_slice == 1) ? data_out_west[23] : // Center
+ (gpio_output_slice == 2) ? data_out_west[43] : // Top
+ data_out_west[3]; // Bottom
+ assign io_out[29] =
+ (gpio_output_slice == 0) ? data_out_west[12] : // Distributed
+ (gpio_output_slice == 1) ? data_out_west[22] : // Center
+ (gpio_output_slice == 2) ? data_out_west[42] : // Top
+ data_out_west[2]; // Bottom
+ assign io_out[30] =
+ (gpio_output_slice == 0) ? data_out_west[7] : // Distributed
+ (gpio_output_slice == 1) ? data_out_west[21] : // Center
+ (gpio_output_slice == 2) ? data_out_west[41] : // Top
+ data_out_west[1]; // Bottom
+ assign io_out[31] =
+ (gpio_output_slice == 0) ? data_out_west[2] : // Distributed
+ (gpio_output_slice == 1) ? data_out_west[20] : // Center
+ (gpio_output_slice == 2) ? data_out_west[40] : // Top
+ data_out_west[0]; // Bottom
+
+ // South side
+ assign io_out[32] =
+ (gpio_output_slice == 0) ? data_out_south[2] : // Distributed
+ (gpio_output_slice == 1) ? data_out_south[11] : // Center
+ (gpio_output_slice == 2) ? data_out_south[24] : // Right
+ data_out_south[0]; // Left
+ assign io_out[33] =
+ (gpio_output_slice == 0) ? data_out_south[7] : // Distributed
+ (gpio_output_slice == 1) ? data_out_south[12] : // Center
+ (gpio_output_slice == 2) ? data_out_south[25] : // Right
+ data_out_south[1]; // Left
+ assign io_out[34] =
+ (gpio_output_slice == 0) ? data_out_south[12] : // Distributed
+ (gpio_output_slice == 1) ? data_out_south[13] : // Center
+ (gpio_output_slice == 2) ? data_out_south[26] : // Right
+ data_out_south[2]; // Left
+ assign io_out[35] =
+ (gpio_output_slice == 0) ? data_out_south[17] : // Distributed
+ (gpio_output_slice == 1) ? data_out_south[14] : // Center
+ (gpio_output_slice == 2) ? data_out_south[27] : // Right
+ data_out_south[3]; // Left
+ assign io_out[36] =
+ (gpio_output_slice == 0) ? data_out_south[22] : // Distributed
+ (gpio_output_slice == 1) ? data_out_south[15] : // Center
+ (gpio_output_slice == 2) ? data_out_south[28] : // Right
+ data_out_south[4]; // Left
+ assign io_out[37] =
+ (gpio_output_slice == 0) ? data_out_south[27] : // Distributed
+ (gpio_output_slice == 1) ? data_out_south[16] : // Center
+ (gpio_output_slice == 2) ? data_out_south[29] : // Right
+ data_out_south[5]; // Left
+
+ // Map the output data from the sides to a single array that can be
+ // broken up into 32 bit segments for data transfer.
+
+ assign data_out = {data_out_north, data_out_east, data_out_south, data_out_west};
+
+ /* Read data (only rdata is something that was not written by the processor) */
+
+ always @* begin
+ rdata_pre = 'b0;
+ if (xfer_sel) begin
+ rdata_pre = {30'b0, busy};
+ end else if (config_sel[0]) begin
+ rdata_pre = rdata[31:0];
+ end else if (config_sel[1]) begin
+ rdata_pre = rdata[63:32];
+ end else if (address_sel) begin
+ /* When ADDRESS is selected, pass back the existing cell */
+ /* count rather than what was written into cell_addr. */
+ rdata_pre = bit_count[ASIZE + 6: 7];
+ end else if (direct_sel) begin
+ rdata_pre = gpio_oeb;
+ end else if (source_sel) begin
+ rdata_pre = {9'b0, gpio_output_slice, 1'b0, gpio_input_slice,
+ 1'b0, north_loopback, 1'b0, east_loopback,
+ 1'b0, south_loopback, 1'b0, west_loopback};
+ end else if (data_sel[0]) begin
+ rdata_pre = data_out[31:0];
+ end else if (data_sel[1]) begin
+ rdata_pre = data_out[63:32];
+ end else if (data_sel[2]) begin
+ rdata_pre = data_out[95:64];
+ end else if (data_sel[3]) begin
+ rdata_pre = data_out[127:96];
+ end else if (data_sel[4]) begin
+ rdata_pre = data_out[159:128];
+ end
+ end
+
+ /* Read data */
+
+ always @(posedge wb_clk_i or posedge wb_rst_i) begin
+ if (wb_rst_i) begin
+ wbs_dat_o <= 0;
+ ready <= 0;
+ end else begin
+ ready <= 0;
+ if (valid && !ready && (wbs_adr_i[31:8] == BASE_ADR[31:8])) begin
+ ready <= 1'b1;
+ wbs_dat_o <= rdata_pre;
+ end
+ end
+ end
+
+ // Map the latched data from the sides to a single array that can be
+ // broken up into 32 bit segments for data transfer.
+
+ assign latched_in_north = latched_in[2*XSIZE+2*YSIZE-1:2*XSIZE+YSIZE];
+ assign latched_in_east = latched_in[2*YSIZE+XSIZE-1:YSIZE+XSIZE];
+ assign latched_in_south = latched_in[YSIZE+XSIZE-1:YSIZE];
+ assign latched_in_west = latched_in[YSIZE-1:0];
+
+ always @(posedge wb_clk_i or posedge wb_rst_i) begin
+ if (wb_rst_i) begin
+ cell_addr <= 0;
+ gpio_oeb <= 0;
+ xfer_ctrl <= 0;
+ local_reset <= 0;
+ west_loopback <= 0;
+ east_loopback <= 0;
+ north_loopback <= 0;
+ south_loopback <= 0;
+ gpio_input_slice <= 0;
+ gpio_output_slice <= 0;
+ latched_in <= 0;
+ wdata <= 0;
+ write <= 1'b0;
+ end else begin
+ write <= 1'b0;
+ if (valid && !ready && wbs_adr_i[31:8] == BASE_ADR[31:8]) begin
+ if (xfer_sel) begin
+ if (iomem_we[0]) begin
+ xfer_ctrl <= wbs_dat_i[1:0];
+ local_reset <= wbs_dat_i[2];
+ end
+ end else if (config_sel[0]) begin
+ if (iomem_we[0]) wdata[7:0] <= wbs_dat_i[7:0];
+ if (iomem_we[1]) wdata[15:8] <= wbs_dat_i[15:8];
+ if (iomem_we[2]) wdata[23:16] <= wbs_dat_i[23:16];
+ if (iomem_we[3]) wdata[31:24] <= wbs_dat_i[31:24];
+ if (|iomem_we) write <= 1'b1;
+ end else if (config_sel[1]) begin
+ if (iomem_we[0]) wdata[39:32] <= wbs_dat_i[7:0];
+ if (iomem_we[1]) wdata[47:40] <= wbs_dat_i[15:8];
+ if (iomem_we[2]) wdata[55:48] <= wbs_dat_i[23:16];
+ if (iomem_we[3]) wdata[63:56] <= wbs_dat_i[31:24];
+ if (|iomem_we) write <= 1'b1;
+ end else if (address_sel) begin
+ // NOTE: Assumes MAXADDR > 256 && MAXADDR < 65536
+ if (iomem_we[0]) cell_addr[7:0] <= wbs_dat_i[7:0];
+ if (iomem_we[1]) cell_addr[ASIZE-1:8] <= wbs_dat_i[ASIZE-1:8];
+ end else if (direct_sel) begin
+ if (iomem_we[0]) gpio_oeb[7:0] <= wbs_dat_i[7:0];
+ if (iomem_we[1]) gpio_oeb[15:8] <= wbs_dat_i[15:8];
+ if (iomem_we[2]) gpio_oeb[23:16] <= wbs_dat_i[23:16];
+ if (iomem_we[3]) gpio_oeb[31:24] <= wbs_dat_i[31:24];
+ end else if (source_sel) begin
+ if (iomem_we[0]) begin
+ west_loopback <= wbs_dat_i[2:0];
+ south_loopback <= wbs_dat_i[6:4];
+ end
+ if (iomem_we[1]) begin
+ east_loopback <= wbs_dat_i[2:0];
+ north_loopback <= wbs_dat_i[6:4];
+ end
+ if (iomem_we[2]) begin
+ gpio_input_slice <= wbs_dat_i[2:0];
+ gpio_output_slice <= wbs_dat_i[6:4];
+ end
+ end else if (data_sel[0]) begin
+ if (iomem_we[0]) latched_in[7:0] <= wbs_dat_i[7:0];
+ if (iomem_we[1]) latched_in[15:8] <= wbs_dat_i[15:8];
+ if (iomem_we[2]) latched_in[23:16] <= wbs_dat_i[23:16];
+ if (iomem_we[3]) latched_in[31:24] <= wbs_dat_i[31:24];
+ end else if (data_sel[1]) begin
+ if (iomem_we[0]) latched_in[39:32] <= wbs_dat_i[7:0];
+ if (iomem_we[1]) latched_in[47:40] <= wbs_dat_i[15:8];
+ if (iomem_we[2]) latched_in[55:48] <= wbs_dat_i[23:16];
+ if (iomem_we[3]) latched_in[63:56] <= wbs_dat_i[31:24];
+ end else if (data_sel[2]) begin
+ if (iomem_we[0]) latched_in[71:64] <= wbs_dat_i[7:0];
+ if (iomem_we[1]) latched_in[79:72] <= wbs_dat_i[15:8];
+ if (iomem_we[2]) latched_in[87:80] <= wbs_dat_i[23:16];
+ if (iomem_we[3]) latched_in[95:88] <= wbs_dat_i[31:24];
+ end else if (data_sel[3]) begin
+ if (iomem_we[0]) latched_in[103:96] <= wbs_dat_i[7:0];
+ if (iomem_we[1]) latched_in[111:104] <= wbs_dat_i[15:8];
+ if (iomem_we[2]) latched_in[119:112] <= wbs_dat_i[23:16];
+ if (iomem_we[3]) latched_in[127:120] <= wbs_dat_i[31:24];
+ end else if (data_sel[4]) begin
+ if (iomem_we[0]) latched_in[135:128] <= wbs_dat_i[7:0];
+ if (iomem_we[1]) latched_in[143:136] <= wbs_dat_i[15:8];
+ if (iomem_we[2]) latched_in[151:144] <= wbs_dat_i[23:16];
+ if (iomem_we[3]) latched_in[159:152] <= wbs_dat_i[31:24];
+ end
+ end else begin
+ xfer_ctrl <= 0; // Immediately self-resetting
+ local_reset <= 0; // Immediately self-resetting
+ end
+ end
+ end
+
+ /* Transfer status */
+
+ assign busy[0] = (xfer_state == `START || xfer_state == `XDATAS);
+ assign busy[1] = (xfer_state == `FINISH || xfer_state == `XDATAF ||
+ xfer_state == `LOAD);
+
+ /* Transfer cycles */
+
+ always @(posedge wb_clk_i or posedge wb_rst_i) begin
+ if (wb_rst_i == 1'b1) begin
+ xfer_state <= `IDLE;
+ bit_count <= 'd0;
+ cell_offset <= 'd0;
+ clk <= 1'b0;
+ hold <= 1'b1;
+ end else begin
+ clk <= 1'b0;
+ hold <= 1'b1;
+ if (xfer_state == `IDLE) begin
+ if (xfer_ctrl[0] == 1'b1) begin
+ xfer_state <= `START;
+ end else if (xfer_ctrl[1] == 1'b1) begin
+ xfer_state <= `FINISH;
+ end
+ end else if (xfer_state == `START) begin
+ bit_count[ASIZE + 6:7] <= cell_addr;
+ bit_count[6:0] <= 7'b1111110;
+ xfer_state <= `XDATAS;
+ end else if (xfer_state == `FINISH) begin
+ bit_count[ASIZE + 6:7] <= `MAXADDR - cell_offset;
+ bit_count[6:0] <= 7'b1111110;
+ xfer_state <= `XDATAF;
+ end else if (xfer_state == `XDATAS) begin
+ clk <= ~clk;
+ bit_count <= bit_count - 1;
+ if (bit_count[6:0] == 0) begin
+ cell_offset <= cell_offset + 1;
+ end
+ if (clk == 1'b0) begin
+ if (bit_count == 0) begin
+ xfer_state <= `IDLE;
+ end
+ end
+ end else if (xfer_state == `XDATAF) begin
+ clk <= ~clk;
+ bit_count <= bit_count - 1;
+ if (bit_count[6:0] == 0) begin
+ cell_offset <= cell_offset + 1;
+ end
+ if (clk == 1'b0) begin
+ if (bit_count == 0) begin
+ xfer_state <= `LOAD;
+ end
+ end
+ end else if (xfer_state == `LOAD) begin
+ hold <= 1'b0;
+ xfer_state <= `IDLE;
+ cell_offset <= 'd0;
+ end
+ end
+ end
+endmodule
+
+/*
+ *-----------------------------------------------------------------
+ * Chaos array (XSIZE * YSIZE)
+ *-----------------------------------------------------------------
+ */
+
+module chaos_array #(
+ parameter XSIZE = 30, /* Total number of cells in X */
+ parameter YSIZE = 30, /* Total number of cells in Y */
+ parameter XTOP = 3, /* Number of sub-arrays in X */
+ parameter YTOP = 3, /* Number of sub-arrays in Y */
+ parameter BASE_ADR = 32'h3000_0000
+)(
+`ifdef USE_POWER_PINS
+ inout vccd1, // User area 1 1.8V supply
+ inout vssd1, // User area 1 digital ground
+`endif
+
+ input clk,
+ input reset,
+ input hold,
+ input write,
+ input [63:0] wdata,
+ output [63:0] rdata,
+ input [YSIZE-1:0] data_in_east, // Perimeter input
+ input [YSIZE-1:0] data_in_west,
+ input [XSIZE-1:0] data_in_north,
+ input [XSIZE-1:0] data_in_south,
+ output [YSIZE-1:0] data_out_east, // Perimeter output
+ output [YSIZE-1:0] data_out_west,
+ output [XSIZE-1:0] data_out_north,
+ output [XSIZE-1:0] data_out_south
+);
+ wire [XSIZE - 1: 0] uconn [YTOP: 0]; // Upward moving data
+ wire [XSIZE - 1: 0] dconn [YTOP: 0]; // Downward moving data
+ wire [YSIZE - 1: 0] rconn [XTOP: 0]; // Rightward moving data
+ wire [YSIZE - 1: 0] lconn [XTOP: 0]; // Leftward moving data
+
+ wire [YTOP - 1: 0] shiftreg [XTOP: 0];
+ wire [YTOP - 1: 0] clkarray [XTOP: 0];
+
+ wire io_data_sel; // wishbone select data
+ wire xfer_sel; // wishbone select transfer
+
+ assign clkarray[0][0] = clk;
+
+ // Sub-array architecture:
+ //
+ // dudu dudu dudu
+ // |^|^ |^|^ |^|^
+ // v|v| v|v| v|v|
+ // +------+ +------+ +------+
+ // r->| |->| |->| |->r
+ // l<-| |<-| |<-| |<-l
+ // r->| |->| |->| |->r
+ // l<-| |<-| |<-| |<-l
+ // +------+ +------+ +------+
+ // |^|^ |^|^ |^|^
+ // v|v| v|v| v|v|
+ // +------+ +------+ +------+
+ // r->| |->| |->| |->r
+ // l<-| |<-| |<-| |<-l
+ // r->| |->| |->| |->r
+ // l<-| |<-| |<-| |<-l
+ // +------+ +------+ +------+
+ // |^|^ |^|^ |^|^
+ // v|v| v|v| v|v|
+ // dudu dudu dudu
+ //
+ // Each box in the above diagram is a sub-array size 2x2.
+ // The top level has XSIZE = 6, YSIZE = 4 with XTOP = 3
+ // and YTOP = 2.
+ //
+ // The top-level inputs and outputs are the perimeter values
+ // on the four edges of the top level array.
+ //
+ // To represent all the connections among the sub-arrays, it
+ // can be seen from the above that d and u (dconn and uconn)
+ // are arrays of size (XSIZE, YTOP + 1), while l and r (lconn
+ // and rconn) are arrays of size (XTOP + 1, YSIZE).
+
+ // NOTE: For viewing internal signals in gtkwave,
+ // some 2D arrays may need to be copied into 1D arrays.
+ // See the original verilog for examples.
+
+ /* The perimeter inputs and outputs connect the array to the
+ * parent module. Note that this hides all the interior data,
+ * which could be an issue with understanding how the circuit
+ * works.
+ */
+
+ assign data_out_north = uconn[YTOP][XSIZE - 1:0];
+ assign data_out_south = dconn[0][XSIZE - 1:0];
+ assign data_out_east = rconn[XTOP][YSIZE - 1:0];
+ assign data_out_west = lconn[0][YSIZE - 1:0];
+
+ assign dconn[YTOP][XSIZE - 1:0] = data_in_north;
+ assign uconn[0][XSIZE - 1:0] = data_in_south;
+ assign rconn[0][YSIZE - 1:0] = data_in_west;
+ assign lconn[XTOP][YSIZE - 1:0] = data_in_east;
+
+ genvar i, j;
+
+ /* NOTE: To see the internal cell values in gtkwave, it is necessary
+ * to split out a few individual instances from the 2D array. Loop
+ * from j = 1 in 2D generate loop, then add a 1D generate loop for
+ * i = N to XSIZE with j set to zero, then add individual instances for
+ * i = 0 to N - 1 with j set to zero.
+ */
+
+ /* Connected array of subarrays */
+ generate
+ for (j = 0; j < YTOP; j=j+1) begin: subarrayy
+ for (i = 0; i < XTOP; i=i+1) begin: subarrayx
+ chaos_subarray #(
+ .XSIZE(XSIZE / XTOP),
+ .YSIZE(YSIZE / YTOP)
+ ) chaos_subarray_inst (
+ `ifdef USE_POWER_PINS
+ .vccd1(vccd1),
+ .vssd1(vssd1),
+ `endif
+ .inorth(dconn[j+1][(i+1)*(XSIZE/XTOP)-1:i*(XSIZE/XTOP)]),
+ .isouth(uconn[j][(i+1)*(XSIZE/XTOP)-1:i*(XSIZE/XTOP)]),
+ .ieast(lconn[i+1][(j+1)*(YSIZE/YTOP)-1:j*(YSIZE/YTOP)]),
+ .iwest(rconn[i][(j+1)*(YSIZE/YTOP)-1:j*(YSIZE/YTOP)]),
+ .onorth(uconn[j+1][(i+1)*(XSIZE/XTOP)-1:i*(XSIZE/XTOP)]),
+ .osouth(dconn[j][(i+1)*(XSIZE/XTOP)-1:i*(XSIZE/XTOP)]),
+ .oeast(rconn[i+1][(j+1)*(YSIZE/YTOP)-1:j*(YSIZE/YTOP)]),
+ .owest(lconn[i][(j+1)*(YSIZE/YTOP)-1:j*(YSIZE/YTOP)]),
+ .reset(reset),
+ .hold(hold),
+ .iclk(clkarray[i][j]),
+ .oclk(clkarray[i+1][j]),
+ .idata(shiftreg[i][j]),
+ .odata(shiftreg[i+1][j])
+ );
+ end
+ end
+
+ /* NOTE: This would work better topologically if each */
+ /* row switched the direction of the shift register. */
+
+ for (j = 0; j < YTOP - 1; j=j+1) begin: shifty
+ assign shiftreg[0][j+1] = shiftreg[XTOP][j];
+ assign clkarray[0][j+1] = clkarray[XTOP][j];
+ end
+ endgenerate
+
+ /* Storage for data transfers to and from the processor. This is */
+ /* 64 bits, so can hold the configuration data for one core cell. */
+
+ reg [63:0] lutdata;
+
+ /* Wire up the lutdata registers as a shift register and connect the */
+ /* ends to the array's shift register to form a loop. */
+
+ always @(posedge clk or posedge write) begin
+ if (write) begin
+ /* Copy data from wdata to lutdata on write */
+ lutdata <= wdata;
+ end else begin
+ /* Shift data on clock when "write" is not raised */
+ lutdata[63:1] <= lutdata[62:0];
+ lutdata[0] <= shiftreg[XTOP][YTOP-1];
+ end
+ end
+
+ assign shiftreg[0][0] = lutdata[63];
+
+ assign rdata = lutdata; /* Data to read back */
+
+endmodule
+`default_nettype wire
