In Verilog, posedge and negedge are keywords used within always blocks to specify the edge-triggered events that should trigger the execution of the block's statements.
posedge:
always block will execute only when the specified signal transitions from 0 to 1.negedge:
always block will execute only when the specified signal transitions from 1 to 0.Example :
always @ (posedge clk) begin
// Code to be executed on the rising edge of the clock signal
end
always @ (negedge rst_n) begin
// Code to be executed on the falling edge of the reset signal
end
Key Points :
posedge and negedge are crucial for designing synchronous circuits where events are triggered by specific transitions of a clock signal.always blocks to create flip-flops, registers, and other sequential logic elements.posedge and negedge depends on the specific requirements of your design and the desired behavior of the circuit.By understanding the use of posedge and negedge, you can effectively model and design digital circuits with precise timing and synchronization in Verilog.