[ibis-macro] Re: RX Optimization
- From: Gregory R Edlund <gedlund@xxxxxxxxxx>
- To: ambrishv@xxxxxxxxxxx
- Date: Fri, 8 Mar 2013 11:51:20 -0600
Amrish,
Thanks for your response. Do I understand correctly that you're
disagreeing with IBIS 5.1, which states:
"Under certain circumstances, for example when the Rx AMI_Init function
includes an optimization algorithm, the impulse response presented to the
Rx AMI_Init function must include the Tx equalization effects for the
optimization to work correctly."
Or are you saying that the simulator and the hardware do not behave the
same way?
Greg Edlund
Senior Engineer
Signal Integrity and System Timing
IBM Systems & Technology Group
3605 Hwy. 52 N Bldg 050-3
Rochester, MN 55901
From: Ambrish Varma <ambrishv@xxxxxxxxxxx>
To: "ibis-macro@xxxxxxxxxxxxx" <ibis-macro@xxxxxxxxxxxxx>
Date: 03/08/2013 11:38 AM
Subject: [ibis-macro] Re: RX Optimization
Sent by: ibis-macro-bounce@xxxxxxxxxxxxx
Hi Greg,
Rx training, when you consider real devices, don’t have any idea how Tx’s
are behaving. In fact they don’t even know if there is any Tx equalization
exist. As such, there cannot and should not be any expectation that the
simulators should handle Tx equalization any differently during Rx
training. The only thing that the simulator has knowledge of is how many
bits to ignore before it starts gathering data for analysis purposes.
Glad you consider section 10 (or at least a part of it) clearly written J.
Thanks,
Ambrish.
From: ibis-macro-bounce@xxxxxxxxxxxxx [
mailto:ibis-macro-bounce@xxxxxxxxxxxxx] On Behalf Of Gregory R Edlund
Sent: Friday, March 08, 2013 12:04 PM
To: ibis-macro@xxxxxxxxxxxxx
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
Other related posts:
