I want to detect glitch for glitch mux

UVM
1

image
image1876×268 10.3 KB

// Glitch detection for positive edge
    always @(posedge clk_out or negedge resetn) begin
        if (!resetn) begin
            prev_clk_time_pos <= 0;
            curr_clk_time_pos <= 0;
        end else begin
            curr_clk_time_pos <= $realtime;  // Store current positive edge time

            // Check pulse width between the previous and current positive edges
            if (prev_clk_time_pos != 0) begin
                if ((curr_clk_time_pos - prev_clk_time_pos) < MIN_PULSE_WIDTH) begin
                    $display("ERROR: Glitch detected on clk_out (positive edge) at time %0t. Pulse width = %0t is less than minimum allowed %0t.",$realtime, curr_clk_time_pos - prev_clk_time_pos, MIN_PULSE_WIDTH);
                end
            end

            prev_clk_time_pos <= curr_clk_time_pos;  // Update previous positive edge time
        end
    end

    // Glitch detection for negative edge
    always @(negedge clk_out or negedge resetn) begin
        if (!resetn) begin
            prev_clk_time_neg <= 0;
            curr_clk_time_neg <= 0;
        end else begin
            curr_clk_time_neg <= $realtime;  // Store current negative edge time

            // Check pulse width between the previous and current negative edges
            if (prev_clk_time_neg != 0) begin
                if ((curr_clk_time_neg - prev_clk_time_neg) < MIN_PULSE_WIDTH) begin
                    $display("ERROR: Glitch detected on clk_out (negative edge) at time %0t. Pulse width = %0t is less than minimum allowed %0t.",$realtime, curr_clk_time_neg - prev_clk_time_neg, MIN_PULSE_WIDTH);
                end
            end

            prev_clk_time_neg <= curr_clk_time_neg;  // Update previous negative edge time
        end
    end

i tried in above but not able to detect properly

2

We can only help you if you post a minimal, complete reproducible example.

3

I want to write checker to detect the glitch in the above wave form