Detect Metastability Window

Write a testbench that measures the setup and hold window of a flip-flop model by sweeping the data edge across the clock edge and detecting when the output becomes unknown.

Constraints

• Sweep the data transition in 1 ps steps across the clock edge.
• Detect an X or an unexpected value on q.
• Report the first and last failing offsets.
• Use timescale 1ps/1ps.
• Must not rely on a fixed delay guess.
• Print the measured window width.