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[/] [s80186/] [trunk/] [fpga/] [leds/] [LEDSRegister.sv] - Rev 2
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// Copyright Jamie Iles, 2017
//
// This file is part of s80x86.
//
// s80x86 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.
//
// s80x86 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 s80x86. If not, see <http://www.gnu.org/licenses/>.
module LEDSRegister(input logic clk,
input logic reset,
output logic [`CONFIG_NUM_LEDS-1:0] leds_val,
input logic cs,
input logic [15:0] data_m_data_in,
input logic data_m_access,
output logic data_m_ack,
input logic data_m_wr_en,
input logic [1:0] data_m_bytesel);
always_ff @(posedge clk or posedge reset)
if (reset)
leds_val <= `CONFIG_NUM_LEDS'b0;
else begin
if (`CONFIG_NUM_LEDS > 8 && cs && data_m_access && data_m_bytesel[1]
&& data_m_wr_en)
leds_val[`CONFIG_NUM_LEDS-1:8] <= data_m_data_in[`CONFIG_NUM_LEDS-1:8];
if (cs && data_m_access && data_m_bytesel[0] && data_m_wr_en)
leds_val[7:0] <= data_m_data_in[7:0];
end
always_ff @(posedge clk)
data_m_ack <= cs & data_m_access;
endmodule