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 VCC_min

-Fast CornerModel

• Indicates fastest possible performance for any single path
• Timing for fastest device at minimum operating temperature and VCC_max

-Why two corner timing models?

• Ensure setup timing is met in slow model
• Ensure hold  timing is met in fast model