One way to design a Verilog counter to convert a 50MHz clock signal to a 1Hz clock signal is to use a divide-by-50,000,000 counter. This counter will count up to a certain value and then reset back to zero, thus generating a clock signal with a frequency equal to the input clock signal divided by the count value.
The Verilog code for a divide-by-50,000,000 counter can be written as follows:
module clk_divider(
input clk_50mHz,
output reg clk_1Hz
);
reg [24:0] count;
always @(posedge clk_50mHz) begin
if (count == 50000000) begin
count <= 0; // Reset the counter
clk_1Hz <= ~clk_1Hz; // Invert the output clock
end else begin
count <= count + 1; // Increment the counter
end
end
endmodule
Explanation:
- The clk_divider
module has an input clk_50mHz
clock signal and an output clk_1Hz
clock signal.
- Inside the module, we declare a register count
with a width of 25 bits (24:0) to store the current count value.
- We use an always
block that triggers on the positive edge of the clk_50mHz
input clock signal. Inside the block, we check if the counter has reached the maximum count value of 50,000,000. If yes, we reset the counter to zero and invert the clk_1Hz
output clock signal. If not, we simply increment the count
register.
- The inverted output clock signal is achieved by using the bitwise NOT (~
) operator on clk_1Hz
.
Note that this implementation assumes that the clock signals are regular and have a 50% duty cycle. If this is not the case, additional logic may be necessary to ensure the output clock signal has the desired characteristics.
Asked: 2021-11-07 11:00:00 +0000
Seen: 1 times
Last updated: Mar 14 '22