115 lines
3.5 KiB
Verilog
115 lines
3.5 KiB
Verilog
// ***************************************************************************
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// ***************************************************************************
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// Copyright (C) 2015-2023 Analog Devices, Inc. All rights reserved.
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//
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// In this HDL repository, there are many different and unique modules, consisting
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// of various HDL (Verilog or VHDL) components. The individual modules are
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// developed independently, and may be accompanied by separate and unique license
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// terms.
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//
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// 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.
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//
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// This core is distributed in the hope that it will be useful, but WITHOUT ANY
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// WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
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// A PARTICULAR PURPOSE.
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//
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// Redistribution and use of source or resulting binaries, with or without modification
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// of this file, are permitted under one of the following two license terms:
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//
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// 1. The GNU General Public License version 2 as published by the
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// Free Software Foundation, which can be found in the top level directory
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// of this repository (LICENSE_GPL2), and also online at:
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// <https://www.gnu.org/licenses/old-licenses/gpl-2.0.html>
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//
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// OR
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//
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// 2. An ADI specific BSD license, which can be found in the top level directory
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// of this repository (LICENSE_ADIBSD), and also on-line at:
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// https://github.com/analogdevicesinc/hdl/blob/main/LICENSE_ADIBSD
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// This will allow to generate bit files and not release the source code,
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// as long as it attaches to an ADI device.
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//
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// ***************************************************************************
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// ***************************************************************************
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`timescale 1ns/100ps
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module axi_gpreg_io #(
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parameter ID = 0
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) (
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// gpio
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output reg [31:0] up_gp_ioenb,
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output reg [31:0] up_gp_out,
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input [31:0] up_gp_in,
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// bus interface
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input up_rstn,
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input up_clk,
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input up_wreq,
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input [13:0] up_waddr,
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input [31:0] up_wdata,
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output reg up_wack,
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input up_rreq,
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input [13:0] up_raddr,
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output reg [31:0] up_rdata,
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output reg up_rack
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);
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// internal registers
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// internal signals
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wire up_wreq_s;
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wire up_rreq_s;
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// decode block select
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assign up_wreq_s = (up_waddr[13:4] == ID) ? up_wreq : 1'b0;
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assign up_rreq_s = (up_raddr[13:4] == ID) ? up_rreq : 1'b0;
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// processor write interface
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always @(negedge up_rstn or posedge up_clk) begin
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if (up_rstn == 0) begin
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up_wack <= 'd0;
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up_gp_ioenb <= {32{1'b1}};
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up_gp_out <= 'd0;
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end else begin
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up_wack <= up_wreq_s;
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if ((up_wreq_s == 1'b1) && (up_waddr[3:0] == 4'h0)) begin
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up_gp_ioenb <= up_wdata;
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end
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if ((up_wreq_s == 1'b1) && (up_waddr[3:0] == 4'h1)) begin
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up_gp_out <= up_wdata;
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end
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end
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end
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// processor read interface
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always @(negedge up_rstn or posedge up_clk) begin
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if (up_rstn == 0) begin
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up_rack <= 'd0;
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up_rdata <= 'd0;
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end else begin
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up_rack <= up_rreq_s;
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if (up_rreq_s == 1'b1) begin
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case (up_raddr[3:0])
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4'b0000: up_rdata <= up_gp_ioenb;
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4'b0001: up_rdata <= up_gp_out;
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4'b0010: up_rdata <= up_gp_in;
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default: up_rdata <= 32'd0;
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endcase
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end else begin
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up_rdata <= 32'd0;
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end
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end
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end
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endmodule
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