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//
// Copyright 2012 Ettus Research LLC
// Copyright 2018 Ettus Research, a National Instruments Company
//
// SPDX-License-Identifier: LGPL-3.0-or-later
//
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// This program 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. See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with this program. If not, see <http://www.gnu.org/licenses/>.
//
// User settings bus
//
// Provides 8-bit address, 32-bit data write only bus for user settings, consumes to addresses in
// normal settings bus.
//
// Write user address to BASE
// Write user data to BASE+1
//
// The user_set_stb will strobe after data write, must write new address even if same as previous one.
module user_settings
#(parameter BASE=0)
(input clk,
input rst,
input set_stb,
input [7:0] set_addr,
input [31:0] set_data,
output set_stb_user,
output [7:0] set_addr_user,
output [31:0] set_data_user
);
wire addr_changed, data_changed;
reg stb_int;
setting_reg #(.my_addr(BASE+0),.width(8)) sr_0
(.clk(clk),.rst(rst),.strobe(set_stb),.addr(set_addr),
.in(set_data),.out(set_addr_user),.changed(addr_changed) );
setting_reg #(.my_addr(BASE+1)) sr_1
(.clk(clk),.rst(rst),.strobe(set_stb),.addr(set_addr),
.in(set_data),.out(set_data_user),.changed(data_changed) );
always @(posedge clk)
if (rst|set_stb_user)
stb_int <= 0;
else
if (addr_changed)
stb_int <= 1;
assign set_stb_user = stb_int & data_changed;
endmodule // user_settings
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