Setup Slack
Hold Slack
Recovery&Removal
Recovery: The minimum time an asynchronous signal must be stable BEFORE clock edge
Removal : The minimum time an asynchronous signal must be stable AFTER clock edge
I/O Analysis
Analyzing I/O performance in a synchronous design uses the same slack equations
– Must include external device & PCB timing parameters
Timing Models
-Slow Corner Model:
- Indicates slowest possible performance for any single path
- Timing for slowest device at maximum operating temperature and VCCmin
-Fast CornerModel
- Indicates fastest possible performance for any single path
- Timing for fastest device at minimum operating temperature and VCCmax
-Why two corner timing models?
- Ensure setup timing is met in slow model
- Ensure hold timing is met in fast model
