I have a basic question about where Tx_Jitter and Tx_DCD are supposed to be applied during simulation: Is the EDA tool supposed to apply Tx_Jitter and Tx_DCD, or is that up to the algorithmic model? I was unable to find the answer in the following sections of IBIS 5.1. Maybe it's in another section that I missed. Section 10.2.3.2, Time Domain Simulation Reference Flow, page 161 Section 10.2.2, Time Domain Simulations, page 160 Section 10A, Reserved Parameters Reference, page 187 Greg Edlund Senior Engineer Signal Integrity and System Timing IBM Systems & Technology Group 3605 Hwy. 52 N Bldg 050-3 Rochester, MN 55901