module rise_pulse(
input wire clk,
input wire rst, // synchronous active-high reset
input wire sig_in,
output reg pulse
);
reg prev; // previous sampled value of sig_in
always @(posedge clk) begin
prev <= (rst) ? 1'b0 : sig_in;
pulse <= (rst) ? 1'b0 : (~prev & sig_in);
end
endmodule