add rom

rom/rom.v

@@ -0,0 +1,21 @@
+/*
+    ROM
+*/
+
+module rom #(
+    parameter DEPTH = 256,
+    parameter W     = 16,
+    parameter FILE  = ""
+) (
+    input                       clk,
+    input [$clog2(DEPTH)-1:0]   addr,
+    output reg [W-1:0]          rd_data
+);
+    reg [W-1:0] mem [0:DEPTH-1];
+
+    initial $readmemh(FILE, mem);
+
+    always @(posedge clk) begin
+        rd_data <= mem[addr];        
+    end
+endmodule