[ibis-macro] Re: RX Optimization
- From: Gregory R Edlund <gedlund@xxxxxxxxxx>
- To: Todd Westerhoff <twesterh@xxxxxxxxxx>
- Date: Fri, 8 Mar 2013 13:02:07 -0600
Todd,
I assume RX self-optimization means setting STATIC RX taps during training.
I assume RX adaptive equalization means setting DYNAMIC RX taps during link
operation (data transfer).
Did I get your drift?
Greg Edlund
Senior Engineer
Signal Integrity and System Timing
IBM Systems & Technology Group
3605 Hwy. 52 N Bldg 050-3
Rochester, MN 55901
From: Todd Westerhoff <twesterh@xxxxxxxxxx>
To: Gregory R Edlund/Rochester/IBM@IBMUS
Cc: ibis-macro@xxxxxxxxxxxxx
Date: 03/08/2013 12:45 PM
Subject: Re: [ibis-macro] RX Optimization
Greg,
RX self-optimization (as opposed to TX/RX co-optimizartion) can happen in
either Init or Getwave (i.e. during either impulse response or waveform
processing). For the optimization to be correct, the input to the RX model
must reflect what the RX will actually see (i.e. include the TX EQ, as you
say).
Note that true adaptive equalization (i.e. equalization that changes from
bit to bit) can only be modeled in Getwave.
Todd.
Todd Westerhoff
VP, Software Products
Signal Integrity Software Inc. • www.sisoft.com
6 Clock Tower Place • Suite 250 • Maynard, MA 01754
(978) 461-0449 x24 • twesterh@xxxxxxxxxx
“I want to live like that”
-Sidewalk Prophets
From: "Gregory R Edlund" <gedlund@xxxxxxxxxx>
To: ibis-macro@xxxxxxxxxxxxx
Sent: Friday, March 8, 2013 12:03:39 PM
Subject: [ibis-macro] RX Optimization
Hello IBIS Comrades,
My co-workers and I were having a discussion today about how simulators
should handle TX equalization during RX training. I took an action item to
run this past the Open Forum and make sure I was speaking correctly.
"RX optimization (adaptive equalization), if it exists, occurs during Step
3, i.e. the call to RX AMI_Init. During optimization the RX algorithmic
model must consider TX equalization, if it exists, and there is more than
one way to accomplish this. Two are documented in the IBIS 5.1."
By the way, Section 10.2.3.2 was clearly written. Most of our questions
were answered simply by reading two pages of the spec.
Greg Edlund
Senior Engineer
Signal Integrity and System Timing
IBM Systems & Technology Group
3605 Hwy. 52 N Bldg 050-3
Rochester, MN 55901
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