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//////////////////////////////////////////////////////////////////////////////////
// Company:
// Engineer:
//
// Create Date: 18.09.2021 12:06:18
// Design Name:
// Module Name: led_flash
// Project Name:
// Target Devices:
// Tool Versions:
// Description:
//
// Dependencies:
//
// Revision:
// Revision 0.01 - File Created
// Additional Comments:
//
//////////////////////////////////////////////////////////////////////////////////
module led_flash(
input clk,
input rst_n,
output led
);
parameter [63:0] CLK_RATE = 100000000;
parameter [63:0] FLASH_RATE_ON_MS = 1000;
parameter [63:0] FLASH_RATE_OFF_MS = 1000;
parameter [63:0] FLASH_RATE_ON_CYCLES = CLK_RATE*FLASH_RATE_ON_MS/1000;
parameter [63:0] FLASH_RATE_OFF_CYCLES = CLK_RATE*FLASH_RATE_OFF_MS/1000;
logic [31:0] flash_counter;
logic on_not_off_flag;
always_ff@(posedge clk, negedge rst_n) begin
if (rst_n == 0) begin
flash_counter <= 0;
on_not_off_flag <= 0;
end
else begin
if (on_not_off_flag) begin
if (flash_counter < FLASH_RATE_ON_CYCLES-1) begin
flash_counter <= flash_counter + 1;
end
else begin
flash_counter <= 0;
on_not_off_flag <= ~on_not_off_flag;
end
end
else begin
if (flash_counter < FLASH_RATE_OFF_CYCLES-1) begin
flash_counter <= flash_counter + 1;
end
else begin
flash_counter <= 0;
on_not_off_flag <= ~on_not_off_flag;
end
end
end
end
assign led = on_not_off_flag;
endmodule
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