Subversion Repositories fwrisc

/****************************************************************************

 * fwrisc_regfile.sv

 *

 * Copyright 2018 Matthew Ballance

 *

 * Licensed under the Apache License, Version 2.0 (the

 * "License"); you may not use this file except in

 * compliance with the License.  You may obtain a copy of

 * the License at

 *

 * http://www.apache.org/licenses/LICENSE-2.0

 *

 * Unless required by applicable law or agreed to in

 * writing, software distributed under the License is

 * distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR

 * CONDITIONS OF ANY KIND, either express or implied.  See

 * the License for the specific language governing

 * permissions and limitations under the License.

 ****************************************************************************/

/**

 * Module: fwrisc_regfile

 *

 * TODO: Add module documentation

 */

module fwrisc_regfile(

                input                           clock,

                input                           reset,

                input[5:0]                      ra_raddr,

                output [31:0]                   ra_rdata,

                input[5:0]                      rb_raddr,

                output [31:0]                   rb_rdata,

                input[5:0]                      rd_waddr,

                input[31:0]                     rd_wdata,

                input                           rd_wen

                );

        reg[5:0]                        ra_raddr_r;

        reg[5:0]                        rb_raddr_r;

        reg[31:0]                       regs['h3f:0];

        initial begin

                $readmemh("regs.hex", regs);

        end

        always @(posedge clock) begin

                ra_raddr_r <= ra_raddr;

                rb_raddr_r <= rb_raddr;

                if (rd_wen) begin

                        regs[rd_waddr] <= rd_wdata;

                end

        end

        assign ra_rdata = regs[ra_raddr_r];

        assign rb_rdata = regs[rb_raddr_r];

endmodule