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|
// io:
// Input and output register, connected to pins of fpga.
module io (
input clk,
input rstn,
input we,
input [31:0] addr,
input [31:0] wd,
output reg [31:0] rd,
input [31:0] io_in,
output reg [31:0] io_out
);
`include "include/consts.vh"
always @ (posedge clk or negedge rstn) begin
if (!rstn) begin
io_out <= 32'b0;
end else if (we && addr == 32'h0000_0004) begin
io_out <= wd;
end
end
always @ (posedge clk) begin
if (addr == 32'h0000_0000) rd <= io_in;
else if (addr == 32'h0000_0004) rd <= io_out;
else rd <= 32'b0;
end
endmodule
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