pluto_hdl_adi/library/axi_gpreg/axi_gpreg_io.v

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// ***************************************************************************
// ***************************************************************************
// Copyright 2014 - 2017 (c) Analog Devices, Inc. All rights reserved.
//
// In this HDL repository, there are many different and unique modules, consisting
// of various HDL (Verilog or VHDL) components. The individual modules are
// developed independently, and may be accompanied by separate and unique license
// terms.
//
// The user should read each of these license terms, and understand the
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// freedoms and responsibilities that he or she has by using this source/core.
//
// This core is distributed in the hope that it will be useful, but WITHOUT ANY
// WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
// A PARTICULAR PURPOSE.
//
// Redistribution and use of source or resulting binaries, with or without modification
// of this file, are permitted under one of the following two license terms:
//
// 1. The GNU General Public License version 2 as published by the
// Free Software Foundation, which can be found in the top level directory
// of this repository (LICENSE_GPL2), and also online at:
// <https://www.gnu.org/licenses/old-licenses/gpl-2.0.html>
//
// OR
//
// 2. An ADI specific BSD license, which can be found in the top level directory
// of this repository (LICENSE_ADIBSD), and also on-line at:
// https://github.com/analogdevicesinc/hdl/blob/master/LICENSE_ADIBSD
// This will allow to generate bit files and not release the source code,
// as long as it attaches to an ADI device.
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//
// ***************************************************************************
// ***************************************************************************
`timescale 1ns/100ps
module axi_gpreg_io #(
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parameter ID = 0) (
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// gpio
output reg [31:0] up_gp_ioenb,
output reg [31:0] up_gp_out,
input [31:0] up_gp_in,
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// bus interface
input up_rstn,
input up_clk,
input up_wreq,
input [13:0] up_waddr,
input [31:0] up_wdata,
output reg up_wack,
input up_rreq,
input [13:0] up_raddr,
output reg [31:0] up_rdata,
output reg up_rack);
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// internal registers
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// internal signals
wire up_wreq_s;
wire up_rreq_s;
// decode block select
assign up_wreq_s = (up_waddr[13:4] == ID) ? up_wreq : 1'b0;
assign up_rreq_s = (up_raddr[13:4] == ID) ? up_rreq : 1'b0;
// processor write interface
always @(negedge up_rstn or posedge up_clk) begin
if (up_rstn == 0) begin
up_wack <= 'd0;
up_gp_ioenb <= {32{1'b1}};
up_gp_out <= 'd0;
end else begin
up_wack <= up_wreq_s;
if ((up_wreq_s == 1'b1) && (up_waddr[3:0] == 4'h0)) begin
up_gp_ioenb <= up_wdata;
end
if ((up_wreq_s == 1'b1) && (up_waddr[3:0] == 4'h1)) begin
up_gp_out <= up_wdata;
end
end
end
// processor read interface
always @(negedge up_rstn or posedge up_clk) begin
if (up_rstn == 0) begin
up_rack <= 'd0;
up_rdata <= 'd0;
end else begin
up_rack <= up_rreq_s;
if (up_rreq_s == 1'b1) begin
case (up_raddr[3:0])
4'b0000: up_rdata <= up_gp_ioenb;
4'b0001: up_rdata <= up_gp_out;
4'b0010: up_rdata <= up_gp_in;
default: up_rdata <= 32'd0;
endcase
end else begin
up_rdata <= 32'd0;
end
end
end
endmodule
// ***************************************************************************
// ***************************************************************************