Added Memory
diff --git a/verilog/rtl/imem.hex b/verilog/rtl/imem.hex
new file mode 100644
index 0000000..8437560
--- /dev/null
+++ b/verilog/rtl/imem.hex
@@ -0,0 +1,4 @@
+00000013
+00d50513
+04a02023
+04002583
\ No newline at end of file
diff --git a/verilog/rtl/sky130_sram_1kbyte_1rw1r_32x256_8.v b/verilog/rtl/sky130_sram_1kbyte_1rw1r_32x256_8.v
new file mode 100644
index 0000000..bc0cdf0
--- /dev/null
+++ b/verilog/rtl/sky130_sram_1kbyte_1rw1r_32x256_8.v
@@ -0,0 +1,115 @@
+// OpenRAM SRAM model
+// Words: 256
+// Word size: 32
+// Write size: 8
+
+module sky130_sram_1kbyte_1rw1r_32x256_8(
+ `ifdef USE_POWER_PINS
+ vccd1,
+ vssd1,
+ `endif
+ // Port 0: RW
+ clk0,csb0,web0,wmask0,addr0,din0,dout0,
+ // Port 1: R
+ clk1,csb1,addr1,dout1
+ );
+
+ parameter NUM_WMASKS = 4 ;
+ parameter DATA_WIDTH = 32 ;
+ parameter ADDR_WIDTH = 8 ;
+ parameter RAM_DEPTH = 1 << ADDR_WIDTH;
+ // FIXME: This delay is arbitrary.
+ parameter DELAY = 3 ;
+ parameter VERBOSE = 1 ; //Set to 0 to only display warnings
+ parameter T_HOLD = 1 ; //Delay to hold dout value after posedge. Value is arbitrary
+
+ `ifdef USE_POWER_PINS
+ inout vccd1;
+ inout vssd1;
+ `endif
+ input clk0; // clock
+ input csb0; // active low chip select
+ input web0; // active low write control
+ input [NUM_WMASKS-1:0] wmask0; // write mask
+ input [ADDR_WIDTH-1:0] addr0;
+ input [DATA_WIDTH-1:0] din0;
+ output [DATA_WIDTH-1:0] dout0;
+ input clk1; // clock
+ input csb1; // active low chip select
+ input [ADDR_WIDTH-1:0] addr1;
+ output [DATA_WIDTH-1:0] dout1;
+
+ reg csb0_reg;
+ reg web0_reg;
+ reg [NUM_WMASKS-1:0] wmask0_reg;
+ reg [ADDR_WIDTH-1:0] addr0_reg;
+ reg [DATA_WIDTH-1:0] din0_reg;
+ reg [DATA_WIDTH-1:0] dout0;
+
+ // All inputs are registers
+ always @(posedge clk0)
+ begin
+ csb0_reg = csb0;
+ web0_reg = web0;
+ wmask0_reg = wmask0;
+ addr0_reg = addr0;
+ din0_reg = din0;
+ #(T_HOLD) dout0 = 32'bx;
+ if ( !csb0_reg && web0_reg && VERBOSE )
+ $display($time," Reading %m addr0=%b dout0=%b",addr0_reg,mem[addr0_reg]);
+ if ( !csb0_reg && !web0_reg && VERBOSE )
+ $display($time," Writing %m addr0=%b din0=%b wmask0=%b",addr0_reg,din0_reg,wmask0_reg);
+ end
+
+ reg csb1_reg;
+ reg [ADDR_WIDTH-1:0] addr1_reg;
+ reg [DATA_WIDTH-1:0] dout1;
+
+ // All inputs are registers
+ always @(posedge clk1)
+ begin
+ csb1_reg = csb1;
+ addr1_reg = addr1;
+ if (!csb0 && !web0 && !csb1 && (addr0 == addr1))
+ $display($time," WARNING: Writing and reading addr0=%b and addr1=%b simultaneously!",addr0,addr1);
+ #(T_HOLD) dout1 = 32'bx;
+ if ( !csb1_reg && VERBOSE )
+ $display($time," Reading %m addr1=%b dout1=%b",addr1_reg,mem[addr1_reg]);
+ end
+
+ reg [DATA_WIDTH-1:0] mem [0:RAM_DEPTH-1];
+
+ // Memory Write Block Port 0
+ // Write Operation : When web0 = 0, csb0 = 0
+ always @ (negedge clk0)
+ begin : MEM_WRITE0
+ if ( !csb0_reg && !web0_reg ) begin
+ if (wmask0_reg[0])
+ mem[addr0_reg][7:0] = din0_reg[7:0];
+ if (wmask0_reg[1])
+ mem[addr0_reg][15:8] = din0_reg[15:8];
+ if (wmask0_reg[2])
+ mem[addr0_reg][23:16] = din0_reg[23:16];
+ if (wmask0_reg[3])
+ mem[addr0_reg][31:24] = din0_reg[31:24];
+ end
+ end
+
+ // Memory Read Block Port 0
+ // Read Operation : When web0 = 1, csb0 = 0
+ always @ (negedge clk0)
+ begin : MEM_READ0
+ if (!csb0_reg && web0_reg)
+ dout0 <= #(DELAY) mem[addr0_reg];
+ end
+
+ // Memory Read Block Port 1
+ // Read Operation : When web1 = 1, csb1 = 0
+ always @ (negedge clk1)
+ begin : MEM_READ1
+ if (!csb1_reg)
+ dout1 <= #(DELAY) mem[addr1_reg];
+ end
+
+ endmodule
+
\ No newline at end of file
diff --git a/verilog/rtl/sky130_sram_2kbyte_1rw1r_32x512_8.v b/verilog/rtl/sky130_sram_2kbyte_1rw1r_32x512_8.v
new file mode 100644
index 0000000..b1f95b0
--- /dev/null
+++ b/verilog/rtl/sky130_sram_2kbyte_1rw1r_32x512_8.v
@@ -0,0 +1,120 @@
+// OpenRAM SRAM model
+// Words: 512
+// Word size: 32
+// Write size: 8
+
+module sky130_sram_2kbyte_1rw1r_32x512_8(
+ `ifdef USE_POWER_PINS
+ vccd1,
+ vssd1,
+ `endif
+ // Port 0: RW
+ clk0,csb0,web0,wmask0,addr0,din0,dout0,
+ // Port 1: R
+ clk1,csb1,addr1,dout1
+ );
+
+ parameter NUM_WMASKS = 4 ;
+ parameter DATA_WIDTH = 32 ;
+ parameter ADDR_WIDTH = 9 ;
+ parameter RAM_DEPTH = 1 << ADDR_WIDTH;
+ // FIXME: This delay is arbitrary.
+ parameter DELAY = 3 ;
+ parameter VERBOSE = 1 ; //Set to 0 to only display warnings
+ parameter T_HOLD = 1 ; //Delay to hold dout value after posedge. Value is arbitrary
+
+ `ifdef USE_POWER_PINS
+ inout vccd1;
+ inout vssd1;
+ `endif
+ input clk0; // clock
+ input csb0; // active low chip select
+ input web0; // active low write control
+ input [NUM_WMASKS-1:0] wmask0; // write mask
+ input [ADDR_WIDTH-1:0] addr0;
+ input [DATA_WIDTH-1:0] din0;
+ output [DATA_WIDTH-1:0] dout0;
+ input clk1; // clock
+ input csb1; // active low chip select
+ input [ADDR_WIDTH-1:0] addr1;
+ output [DATA_WIDTH-1:0] dout1;
+
+ reg csb0_reg;
+ reg web0_reg;
+ reg [NUM_WMASKS-1:0] wmask0_reg;
+ reg [ADDR_WIDTH-1:0] addr0_reg;
+ reg [DATA_WIDTH-1:0] din0_reg;
+ reg [DATA_WIDTH-1:0] dout0;
+
+ // All inputs are registers
+ always @(posedge clk0)
+ begin
+ csb0_reg = csb0;
+ web0_reg = web0;
+ wmask0_reg = wmask0;
+ addr0_reg = addr0;
+ din0_reg = din0;
+ #(T_HOLD) dout0 = 32'bx;
+ if ( !csb0_reg && web0_reg && VERBOSE )
+ $display($time," Reading %m addr0=%b dout0=%b",addr0_reg,mem[addr0_reg]);
+ if ( !csb0_reg && !web0_reg && VERBOSE )
+ $display($time," Writing %m addr0=%b din0=%b wmask0=%b",addr0_reg,din0_reg,wmask0_reg);
+ end
+
+ reg csb1_reg;
+ reg [ADDR_WIDTH-1:0] addr1_reg;
+ reg [DATA_WIDTH-1:0] dout1;
+
+ // All inputs are registers
+ always @(posedge clk1)
+ begin
+ csb1_reg = csb1;
+ addr1_reg = addr1;
+ if (!csb0 && !web0 && !csb1 && (addr0 == addr1))
+ $display($time," WARNING: Writing and reading addr0=%b and addr1=%b simultaneously!",addr0,addr1);
+ #(T_HOLD) dout1 = 32'bx;
+ if ( !csb1_reg && VERBOSE )
+ $display($time," Reading %m addr1=%b dout1=%b",addr1_reg,mem[addr1_reg]);
+ end
+
+ reg [DATA_WIDTH-1:0] mem [0:RAM_DEPTH-1];
+
+ // Memory Write Block Port 0
+ // Write Operation : When web0 = 0, csb0 = 0
+ always @ (negedge clk0)
+ begin : MEM_WRITE0
+ if ( !csb0_reg && !web0_reg ) begin
+ if (wmask0_reg[0])
+ mem[addr0_reg][7:0] = din0_reg[7:0];
+ if (wmask0_reg[1])
+ mem[addr0_reg][15:8] = din0_reg[15:8];
+ if (wmask0_reg[2])
+ mem[addr0_reg][23:16] = din0_reg[23:16];
+ if (wmask0_reg[3])
+ mem[addr0_reg][31:24] = din0_reg[31:24];
+ end
+ end
+
+ // Memory Read Block Port 0
+ // Read Operation : When web0 = 1, csb0 = 0
+ always @ (negedge clk0)
+ begin : MEM_READ0
+ if (!csb0_reg && web0_reg)
+ dout0 <= #(DELAY) mem[addr0_reg];
+ end
+
+ // Memory Read Block Port 1
+ // Read Operation : When web1 = 1, csb1 = 0
+ always @ (negedge clk1)
+ begin : MEM_READ1
+ if (!csb1_reg)
+ dout1 <= #(DELAY) mem[addr1_reg];
+ end
+
+ initial begin
+ $display("Reading Memory");
+ $readmemh("imem.hex", mem);
+ end
+
+ endmodule
+
\ No newline at end of file
