Greg, Section 2 is called APPLICATION SCENARIOS and section 3 is called Reference Flows. The first sentence in section 2 says: | The next two sections provide an overview of the two simulation types | supported by the IBIS-AMI specification. and the first sentence in section 3 says: | The next two sections define a reference simulation flow for statistical | and time domain system analysis simulations. Does that answer your question? Thanks, Arpad ========================================================= From: ibis-macro-bounce@xxxxxxxxxxxxx [mailto:ibis-macro-bounce@xxxxxxxxxxxxx] On Behalf Of Gregory R Edlund Sent: Tuesday, March 13, 2012 8:36 AM To: ibis-macro@xxxxxxxxxxxxx Subject: [ibis-macro] BIRD 120.1 Question Can anybody explain the difference between section 2.2 and 3.2 of BIRD 120.1? Both seem to be describing the high-level process for calculating a voltage-time waveform from AMI models, a channel, and a bit stream. Thanks. Greg Edlund Senior Engineer Signal Integrity and System Timing IBM Systems & Technology Group 3605 Hwy. 52 N Bldg 050-3 Rochester, MN 55901