RegFile: I/O rename
[firearm.git] / RegFile.v
index 95e5c71..dec1907 100644 (file)
--- a/RegFile.v
+++ b/RegFile.v
@@ -1,59 +1,38 @@
 module RegFile(
-       input clk,
-       input [3:0] read_0,
-       output reg [31:0] rdata_0,
-       input [3:0] read_1,
-       output reg [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,
-       input [31:0] write_data
+       input              clk,
+       input              Nrst,
+       input        [3:0] rf__read_0_1a,
+       output wire [31:0] rf__rdata_0_1a,
+       input        [3:0] rf__read_1_1a,
+       output wire [31:0] rf__rdata_1_1a,
+       input        [3:0] rf__read_2_1a,
+       output wire [31:0] rf__rdata_2_1a,
+       input        [3:0] rf__read_3_3a,
+       output wire [31:0] rf__rdata_3_3a,
+       output wire [31:0] spsr,
+       input              write,
+       input        [3:0] write_reg,
+       input       [31:0] write_data
        );
        
        reg [31:0] regfile [0:15];
+       integer i;
        
        initial begin
-               regfile[4'h0] = 32'h00000005;
-               regfile[4'h1] = 32'h00000050;
-               regfile[4'h2] = 32'h00000500;
-               regfile[4'h3] = 32'h00005000;
-               regfile[4'h4] = 32'h00050000;
-               regfile[4'h5] = 32'h00500000;
-               regfile[4'h6] = 32'h05000000;
-               regfile[4'h7] = 32'h50000000;
-               regfile[4'h8] = 32'hA0000000;
-               regfile[4'h9] = 32'h0A000000;
-               regfile[4'hA] = 32'h00A00000;
-               regfile[4'hB] = 32'h000A0000;
-               regfile[4'hC] = 32'h0000A000;
-               regfile[4'hD] = 32'h00000A00;
-               regfile[4'hE] = 32'h000000A0;
-               regfile[4'hF] = 32'h00000000;   /* Start off claiming we are in user mode. */
+               for (i = 0; i < 16; i = i + 1)
+                       regfile[i] = 0;
        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 rf__rdata_0_1a = ((rf__read_0_1a == write_reg) && write) ? write_data : regfile[rf__read_0_1a];
+       assign rf__rdata_1_1a = ((rf__read_1_1a == write_reg) && write) ? write_data : regfile[rf__read_1_1a];
+       assign rf__rdata_2_1a = ((rf__read_2_1a == write_reg) && write) ? write_data : regfile[rf__read_2_1a];
+       assign rf__rdata_3_3a = ((rf__read_3_3a == write_reg) && write) ? write_data : regfile[rf__read_3_3a];
+       assign spsr = regfile[4'hF];
        
-       always @(posedge clk)
-               if (write_req)
-                       regfile[write] <= write_data;
+       always @(posedge clk or negedge Nrst)
+               if (!Nrst) begin
+                       for (i = 0; i < 16; i = i + 1)
+                               regfile[i] <= 0;
+               end else if (write)
+                       regfile[write_reg] <= write_data;
 endmodule
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