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Baud_Delay.v
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Baud_Delay.v
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//////////////////////////////////////////////////////////////////////////////////
// Author: Brandon Torres
// Email: [email protected]
// Filename: Baud_Counter.v
//
// Notes: The Baud rate is only set on reset and cannot be changed during run.
// The module sets the Baud rate for the UART depending on the user
// input. Once the Baud time has passed then BTU is set for one clock.
//////////////////////////////////////////////////////////////////////////////////
module Baud_Delay(clk,reset,Start,Baud_Val,BTU);
input clk,reset,Start;
input [3:0] Baud_Val;
output wire BTU;
reg [17:0] count_val;
reg [17:0] q_reg;
wire[17:0] q_next;
always @(posedge clk, negedge reset)
if(!reset)begin
q_reg<=0;
case(Baud_Val)
4'b0000: count_val<=166666/2; //300 Baud
4'b0001: count_val<=83332/2; //600 Baud
4'b0010: count_val<=41666/2; //1200 Baud
4'b0011: count_val<=20832/2; //2400 Baud
4'b0100: count_val<=10416/2; //4800 Baud
4'b0101: count_val<=5207/2; //9600 Baud
4'b0110: count_val<=2603/2; //19200 Baud
4'b0111: count_val<=1760/2; //28400 Baud
4'b1000: count_val<=867/2; //57600 Baud
4'b1001: count_val<=433/2; //115200 Baud
4'b1010: count_val<=216/2; //230400 Baud
4'b1011: count_val<=108/2; //460800 Baud
4'b1100: count_val<=53/2; //921600 Baud
default: count_val<=166666/2; //Default is 300 Baud
endcase
end
else if(!Start)
q_reg<=0;
else if(BTU)
q_reg<=q_reg;
else
q_reg<=q_next;
assign q_next=q_reg+1;
//set tick when after each BTU
assign BTU= (q_reg==count_val) ? 1'b1 : 1'b0;
endmodule