queue
is an array of 4 registers, representing the LIFO queue. Each register holds 8 bits of data.top
is a 2-bit register used to keep track of the top element in the queue.- The
always
block is sensitive to the rising edge of the clock signal and the reset signal. - When the reset signal is asserted (
reset
is high), it clears the top pointer and sets all elements in the queue to zero. - When the
push
signal is asserted (push
is high), it checks if there is space in the queue (top < 2'b11) and increments the top pointer to push data into the queue. - When the
pop
signal is asserted (pop
is high), it checks if there are elements in the queue (top > 2'b00), pops data from the queue, and decrements the top pointer.
This Verilog module represents a basic LIFO queue with a fixed size of 4 elements. You can modify the number of elements or the data width to suit your specific requirements.