added register file

1 files changed, 30 insertions, 0 deletions

diff --git a/src/register_file.v b/src/register_file.v
new file mode 100644
index 0000000..81bce34
--- /dev/null
+++ b/src/register_file.v
@@ -0,0 +1,30 @@
+module register_file #(
+  parameter N = 32,
+  parameter XLEN = 32
+)(
+  input clk, rst, we,
+  input [log2(N)-1:0] addr_rs0, addr_rs1, addr_rd2,
+  input [N-1:0] data_rd2,
+  output [N-1:0] data_rs0, data_rs1
+);
+
+`include "include/log2.vh"
+
+reg [N-1:0] registers[XLEN-1:1];
+
+assign data_rs0 = (addr_rs0 == 0) ? 0 : registers[addr_rs0];
+assign data_rs1 = (addr_rs1 == 0) ? 0 : registers[addr_rs1];
+
+
+
+integer i;
+always @(posedge clk) begin
+  if (rst) begin
+    for (i = 1; i < XLEN; i = i + 1)
+      registers[i] <= 0;
+  end else if (we && (addr_rd2 != 0)) begin
+    registers[addr_rd2] <= data_rd2;
+  end
+end
+
+endmodule