3/12/2024 0 Comments Verilog bit count![]() However, we need to have internal variables to generate, store and drive the clock and reset.įor this purpose, we have declared two variables of type reg for clock and reset. The testbench module is named tb_counter, and ports are not required since this is the top-module in simulation. We can instantiate the design into our testbench module to verify that the counter is counting as expected. If reset is low at the clock's positive edge, then output is reset to a default value of 4'b0000. The output is incremented only if reset is held high or 1, achieved by the if-else block. The always block is executed whenever the clock transitions from 0 to 1, which signifies a positive edge or a rising edge. The module counter has a clock and active-low reset ( n) as inputs and the counter value as a 4-bit output. If reset is 1, then the design should be allowed to count up, so increment the counter Once inside this block, it checks if the reset is 0, then change out to zero ![]() This always block will be triggered at the rising edge of clk (0->1) Output reg out) // Declare 4-bit output port to get the counter values Input rstn, // Declare input port for the reset to allow the counter to be reset to 0 when required Module counter (input clk, // Declare input port for the clock to allow counter to count up
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