tests/Makefile: Add a target to pad binaries for Xilinx tools.
[firearm.git] / RegFile.v
index 95e5c71..c0e5abd 100644 (file)
--- a/RegFile.v
+++ b/RegFile.v
@@ -1,14 +1,16 @@
 module RegFile(
        input clk,
        input [3:0] read_0,
-       output reg [31:0] rdata_0,
+       output wire [31:0] rdata_0,
        input [3:0] read_1,
-       output reg [31:0] rdata_1,
+       output wire [31:0] rdata_1,
        input [3:0] read_2,
-       output reg [31:0] rdata_2,
-       output reg [31:0] spsr,
-       input [3:0] write,
-       input write_req,
+       output wire [31:0] rdata_2,
+       input [3:0] read_3,
+       output wire [31:0] rdata_3,
+       output wire [31:0] spsr,
+       input write,
+       input [3:0] write_reg,
        input [31:0] write_data
        );
        
@@ -33,27 +35,13 @@ module RegFile(
                regfile[4'hF] = 32'h00000000;   /* Start off claiming we are in user mode. */
        end
        
-       always @(*)
-       begin
-               if ((read_0 == write) && write_req)
-                       rdata_0 = write_data;
-               else
-                       rdata_0 = regfile[read_0];
-               
-               if ((read_1 == write) && write_req)
-                       rdata_1 = write_data;
-               else
-                       rdata_1 = regfile[read_1];
-               
-               if ((read_2 == write) && write_req)
-                       rdata_2 = write_data;
-               else
-                       rdata_2 = regfile[read_2];
-               
-               spsr = regfile[4'hF];
-       end
+       assign rdata_0 = ((read_0 == write_reg) && write) ? write_data : regfile[read_0];
+       assign rdata_1 = ((read_1 == write_reg) && write) ? write_data : regfile[read_1];
+       assign rdata_2 = ((read_2 == write_reg) && write) ? write_data : regfile[read_2];
+       assign rdata_3 = ((read_3 == write_reg) && write) ? write_data : regfile[read_3];
+       assign spsr = regfile[4'hF];
        
        always @(posedge clk)
-               if (write_req)
-                       regfile[write] <= write_data;
+               if (write)
+                       regfile[write_reg] <= write_data;
 endmodule
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