[ibis-macro] Re: Tx_Jitter and Tx_DCD
- From: Gregory R Edlund <gedlund@xxxxxxxxxx>
- To: ambrishv@xxxxxxxxxxx
- Date: Fri, 9 Aug 2013 11:15:47 -0500
Ambrish,
In the case of Tx_Jitter, it's usage is defined as Info, Out in IBIS 5.1.
What kind of information might the algorithmic model supply to the EDA tool
that would require Usage = Out?
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: Gregory R Edlund/Rochester/IBM@IBMUS,
"ibis-macro@xxxxxxxxxxxxx" <ibis-macro@xxxxxxxxxxxxx>
Date: 08/09/2013 10:28 AM
Subject: [ibis-macro] Re: Tx_Jitter and Tx_DCD
Sent by: ibis-macro-bounce@xxxxxxxxxxxxx
Greg,
Tx_Jitter and Tx_DCD in the current spec can be of Usage Info or Out –
which by definition are either info for the EDA tool or value out from the
AMI model.
Any parameter that is going to be used by the AMI model will be of Usage
In.
Thanks
Ambrish.
From: ibis-macro-bounce@xxxxxxxxxxxxx [
mailto:ibis-macro-bounce@xxxxxxxxxxxxx] On Behalf Of Gregory R Edlund
Sent: Friday, August 09, 2013 11:06 AM
To: Kumar Keshavan; ibis-macro@xxxxxxxxxxxxx
Subject: [ibis-macro] Re: Tx_Jitter and Tx_DCD
Thank you, Kumar.
Is anyone aware of language in the specification saying that the EDA tool
should apply Reserved_Parameters and not the algorithmic model (DLL)? I
need to know so I can instruct our internal model users on what to expect
from the vendors they're working with. We're looking at a case where it
appears the vendor included transmitter jitter inside the DLL. I don't see
a problem with this as long as we know about it and we're not simulating
the same jitter from both the DLL and the EDA tool.
Here's what I found in Section 10A, page 183. By inference, the optional
Reserved_Parameters should also be used by the EDA tool and not the
algorithmic model.
RESERVED PARAMETERS REFERENCE
The parameter definition file shall have a branch with the heading
“Reserved_Parameters”. This branch shall contain all the Reserved
Parameters for the model.
The following Reserved Parameters are used by the EDA tool and are required
if the [Algorithmic Model] keyword is present.
Greg Edlund
Senior Engineer
Signal Integrity and System Timing
IBM Systems & Technology Group
3605 Hwy. 52 N Bldg 050-3
Rochester, MN 55901
Inactive hide details for Kumar Keshavan ---08/09/2013 09:44:11 AM---if
they are in Reserved_Parameters it becomes the responsKumar Keshavan
---08/09/2013 09:44:11 AM---if they are in Reserved_Parameters it becomes
the responsibility of the eda tool __________________
From: Kumar Keshavan <ckumar@xxxxxxxxxxx>
To: Gregory R Edlund/Rochester/IBM@IBMUS
Date: 08/09/2013 09:44 AM
Subject: RE: [ibis-macro] Tx_Jitter and Tx_DCD
if they are in Reserved_Parameters it becomes the responsibility of the
eda tool
________________________________________
From: ibis-macro-bounce@xxxxxxxxxxxxx [ibis-macro-bounce@xxxxxxxxxxxxx] On
Behalf Of Gregory R Edlund [gedlund@xxxxxxxxxx]
Sent: Friday, August 09, 2013 10:27 AM
To: ibis-macro@xxxxxxxxxxxxx
Subject: [ibis-macro] Tx_Jitter and Tx_DCD
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
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