RegFile.v

   1 module RegFile(
   2         input              clk,
   3         input              Nrst,
   4         input        [3:0] rf__read_0_1a,
   5         output wire [31:0] rf__rdata_0_1a,
   6         input        [3:0] rf__read_1_1a,
   7         output wire [31:0] rf__rdata_1_1a,
   8         input        [3:0] rf__read_2_1a,
   9         output wire [31:0] rf__rdata_2_1a,
  10         input        [3:0] rf__read_3_4a,
  11         output wire [31:0] rf__rdata_3_4a,
  12         output wire [31:0] spsr,
  13         input              write,
  14         input        [3:0] write_reg,
  15         input       [31:0] write_data
  16         );
  17
  18         reg [31:0] regfile [0:15];
  19         integer i;
  20
  21         initial begin
  22                 for (i = 0; i < 16; i = i + 1)
  23                         regfile[i] = 0;
  24         end
  25
  26         assign rf__rdata_0_1a = ((rf__read_0_1a == write_reg) && write) ? write_data : regfile[rf__read_0_1a];
  27         assign rf__rdata_1_1a = ((rf__read_1_1a == write_reg) && write) ? write_data : regfile[rf__read_1_1a];
  28         assign rf__rdata_2_1a = ((rf__read_2_1a == write_reg) && write) ? write_data : regfile[rf__read_2_1a];
  29         assign rf__rdata_3_4a = ((rf__read_3_4a == write_reg) && write) ? write_data : regfile[rf__read_3_4a];
  30         assign spsr = regfile[4'hF];
  31
  32         always @(posedge clk or negedge Nrst)
  33                 if (!Nrst) begin
  34                         for (i = 0; i < 16; i = i + 1)
  35                                 regfile[i] <= 0;
  36                 end else if (write)
  37                         regfile[write_reg] <= write_data;
  38 endmodule