Setup Time & Hold Time Violation

JONGHWAN ShinAjou University

Setup time and Hold time

• For proper operation of a flip-flop, flip-flop input need to be constant during setup time and hold time.

• Setup time is the minimum amount of time to prepare an input before a clock event.

• Hold time is the minimum amount of time to determine a value of an input after a clock event.

The value of a input is constant during setup time and hold time.

1. Normal Operation

201220874 신종환 201020103 여영근 201020124 이기안

Flip-flop inputs are floating in setup time. Setup time violation is occurred.

2. Setup time violation

201220874 신종환 201020103 여영근 201020124 이기안

Flip-flop inputs are floating in hold time. Hold time violation is occurred.

3. Hold time violation

201220874 신종환 201020103 여영근 201020124 이기안