[ibis-macro] Re: RX Optimization

  • From: Todd Westerhoff <twesterh@xxxxxxxxxx>
  • To: gedlund@xxxxxxxxxx
  • Date: Fri, 8 Mar 2013 13:45:03 -0500 (EST)


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. 


Description: cid:EAFF2D52-4B63-4A05-9D24-B96BE375B7E0@eau.wi.charter.com
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 
----- Original Message -----

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 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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