YunMIPS/Src/regfile.v

`include "../Defines.v"

module regfile(input wire          clk,
               input wire          rst,
               input wire          we,
               input wire[`RegAddrBus]    waddr,
               input wire[`RegBus]      wdata,
               input wire          re1,
               input wire[`RegAddrBus]    raddr1,
               output reg[`RegBus] rdata1,
               input wire          re2,
               input wire[`RegAddrBus]    raddr2,
               output reg[`RegBus] rdata2);
    
    reg[`RegBus]  regs[0:`RegNum-1];
    
    always @ (posedge clk) begin
        if (rst == `RstDisable) begin
            if ((we == `WriteEnable) && (waddr != `RegNumLog2'h0)) begin
                regs[waddr] <= wdata;
            end
        end
    end
    
    always @ (*) begin
        if (rst == `RstEnable) begin
            rdata1 <= `ZeroWord;
            end else if (raddr1 == `RegNumLog2'h0) begin
            rdata1 <= `ZeroWord;
            end else if ((raddr1 == waddr) && (we == `WriteEnable)
            && (re1 == `ReadEnable)) begin
            rdata1 <= wdata;
            end else if (re1 == `ReadEnable) begin
            rdata1 <= regs[raddr1];
            end else begin
            rdata1 <= `ZeroWord;
        end
    end
    
    always @ (*) begin
        if (rst == `RstEnable) begin
            rdata2 <= `ZeroWord;
            end else if (raddr2 == `RegNumLog2'h0) begin
            rdata2 <= `ZeroWord;
            end else if ((raddr2 == waddr) && (we == `WriteEnable)
            && (re2 == `ReadEnable)) begin
            rdata2 <= wdata;
            end else if (re2 == `ReadEnable) begin
            rdata2 <= regs[raddr2];
            end else begin
            rdata2 <= `ZeroWord;
        end
    end
    
endmodule