Update user_proj_example.v
Adding in the counter so we can verify Caravel is working correctly.
diff --git a/verilog/rtl/user_proj_example.v b/verilog/rtl/user_proj_example.v
index 04421fe..95654f8 100644
--- a/verilog/rtl/user_proj_example.v
+++ b/verilog/rtl/user_proj_example.v
@@ -56,14 +56,55 @@
output [2:0] irq
);
+ wire clk;
+ wire rst;
+
+ wire [31:0] rdata;
+ wire [31:0] wdata;
+ wire [BITS-1:0] count;
+
+ wire valid;
+ wire [3:0] wstrb;
+ wire [31:0] la_write;
+
+ // WB MI A
+ assign valid = wbs_cyc_i && wbs_stb_i;
+ assign wstrb = wbs_sel_i & {4{wbs_we_i}};
+ assign wbs_dat_o = rdata;
+ assign wdata = wbs_dat_i;
+
+ // IRQ
+ assign irq = 3'b000; // Unused
+
+ // LA
+ assign la_data_out = {{(127-BITS){1'b0}}, count};
+ // Assuming LA probes [63:32] are for controlling the count register
+ assign la_write = ~la_oenb[63:32] & ~{BITS{valid}};
+ // Assuming LA probes [65:64] are for controlling the count clk & reset
+ assign clk = (~la_oenb[64]) ? la_data_in[64]: wb_clk_i;
+ assign rst = (~la_oenb[65]) ? la_data_in[65]: wb_rst_i;
+
+ counter #(
+ .BITS(BITS)
+ ) counter(
+ .clk(clk),
+ .reset(rst),
+ .ready(wbs_ack_o),
+ .valid(valid),
+ .rdata(rdata),
+ .wdata(wbs_dat_i),
+ .wstrb(wstrb),
+ .la_write(la_write),
+ .la_input(la_data_in[63:32]),
+ .count(count)
+ );
+
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] mode = io_in[37:36];
-
-
Minx16Top cpu16 (
.clk_i (io_in [33])
, .rst_i (io_in [32])
@@ -125,4 +166,46 @@
endmodule
+module counter #(
+ parameter BITS = 32
+)(
+ input clk,
+ input reset,
+ input valid,
+ input [3:0] wstrb,
+ input [BITS-1:0] wdata,
+ input [BITS-1:0] la_write,
+ input [BITS-1:0] la_input,
+ output ready,
+ output [BITS-1:0] rdata,
+ output [BITS-1:0] count
+);
+ reg ready;
+ reg [BITS-1:0] count;
+ reg [BITS-1:0] rdata;
+
+ always @(posedge clk) begin
+ if (reset) begin
+ count <= 0;
+ ready <= 0;
+ end else begin
+ ready <= 1'b0;
+ if (~|la_write) begin
+ count <= count + 1;
+ end
+ if (valid && !ready) begin
+ ready <= 1'b1;
+ rdata <= count;
+ if (wstrb[0]) count[7:0] <= wdata[7:0];
+ if (wstrb[1]) count[15:8] <= wdata[15:8];
+ if (wstrb[2]) count[23:16] <= wdata[23:16];
+ if (wstrb[3]) count[31:24] <= wdata[31:24];
+ end else if (|la_write) begin
+ count <= la_write & la_input;
+ end
+ end
+ end
+
+endmodule
+
`default_nettype wire
