Create data-memory.v

data-memory.v

@@ -0,0 +1,78 @@
+module DMEM 
+  (
+   data_out,
+
+   clk,
+   writeCntrl_in,
+   readCntrl_in,
+   address_in,
+   writeData_in   
+   );
+
+   // Delay to do a memory read or write
+   parameter   memory_delay = 20;
+
+   output [31:0] data_out;
+   reg [31:0] 	 data_out;
+
+   input 	 clk;
+   input 	 writeCntrl_in;
+   input 	 readCntrl_in;
+   input [31:0]  address_in;
+   input [31:0]  writeData_in;
+
+   reg [4:0] 	 word_address;
+
+   // We allocate space for 32 items
+   reg [31:0] 	 mem_array[0:31];
+
+   // Reading the data words from the file into the array
+   initial 
+     begin
+	$readmemh("data.txt", mem_array, 0, 31);
+     end  
+
+
+   always @(address_in, readCntrl_in)
+     begin
+	#memory_delay;
+
+	// word_address = (address_in - 0x00400000) / 4
+	word_address= (address_in - 32'h10000000) >> 2;
+
+	if ((address_in[31]) | (address_in > 32'h1000007C) | !readCntrl_in)
+	  data_out = 32'bxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx;
+	else
+	  data_out = mem_array[word_address];
+
+     end // always @ (address_in, readCntrl_in)
+
+
+   always @(posedge clk)
+     begin
+	#memory_delay;
+
+	if (writeCntrl_in)
+	  mem_array[word_address] = writeData_in;
+
+     end // always @ (posedge clk)
+
+endmodule // DMEM
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