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wd5gnr |
/*
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This file is part of Blue8.
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Foobar is free software: you can redistribute it and/or modify
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it under the terms of the GNU Lesser General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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Foobar is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public License
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along with Blue8. If not, see <http://www.gnu.org/licenses/>.
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Blue8 by Al Williams alw@al-williams.com
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*/
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`timescale 1ns / 1ps
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////////////////////////////////////////////////////////////////////////////////
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// Company:
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// Engineer:
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//
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// Create Date: 22:15:16 01/11/06
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// Design Name:
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// Module Name: gpreg
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// Project Name:
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// Target Device:
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// Tool versions:
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// Description:
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//
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// Dependencies:
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//
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// Revision:
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// Revision 0.01 - File Created
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// Additional Comments:
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//
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////////////////////////////////////////////////////////////////////////////////
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module gpreg(input clk, input wire [15:0] din, output wire [15:0] dout, input wire [3:0] wselect,
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input wire [3:0] sendselect, input wire write, input wire send,
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output wire awrite, output wire asend, output wire pwrite, output wire psend);
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reg [15:0] values[11];
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assign awrite=write & (wselect==4'h4);
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assign asend=send & (sendselect==4'h4);
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assign pwrite=write & (wselect==4'h3);
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assign psend= send & (sendselect==4'h3);
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// put a case here for write
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always @(posedge clk) begin
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if (write) begin
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case (wselect) begin
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4'b0101: values[0]<=din;
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4'b0110: values[1]<=din;
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4'b0111: values[2]<=din;
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4'b1000: values[3]<=din;
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4'b1001: values[4]<=din;
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4'b1010: values[5]<=din;
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4'b1011: values[6]<=din;
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4'b1100: values[7]<=din;
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4'b1101: values[8]<=din;
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4'b1110: values[9]<=din;
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4'b1111: values[10]<=din;
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default: ;
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end
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end
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end
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// put a case here for send
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always @(posedge clk) begin
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if (send) begin
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case (sendselect) begin
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4'b0101: dout<=values[0];
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4'b0110: dout<=values[1];
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4'b0111: dout<=values[2];
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4'b1000: dout<=values[3];
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4'b1001: dout<=values[4];
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4'b1010: dout<=values[5];
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4'b1011: dout<=values[6];
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4'b1100: dout<=values[7];
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4'b1101: dout<=values[8];
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4'b1110: dout<=values[9];
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4'b1111: dout<=values[10];
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default: dout<=16'bz;
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end
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end
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end
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endmodule
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