[SI-LIST] Re: Bit pattern for high speed serial link simulation
- From: "Perry Qu" <perry.qu@xxxxxxxxxxx>
- To: <gary_pratt@xxxxxxxxxx>, "'si-list'" <si-list@xxxxxxxxxxxxx>
- Date: Tue, 29 Nov 2005 14:06:06 -0500
Gary:
Thanks for your suggestion. I'm interested in more details of AMS model.
Currently we use heavily Mentor SI tool for general board simulation (ICX
and ePD) but we still use HSPICE for Gbps stuff.
The device I'm referring to is Virtex II Pro Rocket I/O. I roughly remember
that Xilinx provide some type of behavior model for ICX but not sure whether
this is what you are referring to. Please let me know.
Regards
Perry
=======================================
Perry Qu
Design & Qualification, Alcatel Canada
600 March Road, Ottawa ON, K2K 2E6
DID: 613-7846720 Fax: 613-5993642
Email: perry.qu@xxxxxxxxxxx
=======================================
-----Original Message-----
From: si-list-bounce@xxxxxxxxxxxxx [mailto:si-list-bounce@xxxxxxxxxxxxx] On
Behalf Of Pratt, Gary
Sent: Tuesday, November 29, 2005 12:37 PM
To: Perry.Qu@xxxxxxxxxxx; si-list
Subject: [SI-LIST] Re: Bit pattern for high speed serial link simulation
Perry,
With an AMS model and an AMS-SI simulator, you could simulate your
PRBS15 pattern in an hour or so. And, you wouldn't need to be concerned
with the loss of crosstalk or non-linear driver information which are
characteristic of many frequency-domain channel analysis techniques.
With an AMS model, you could also investigate the effects of PLL jitter and
other sampling effects. And, you could simulate the non-deterministic
jitter to investigate any possible jitter amplification caused by the
channel. Plus, you could add automated measurements to accelerate your
analysis process. Plus ...
I'll be delivering a half-day tutorial on AMS and IBIS 4.1 at DesignCon
February 6 if you are interested. Could also do a 45-minute WebEx summary
if you have enough interest at your company. =20
To gain the full benefit of the AMS model speed, it is also important to use
a simulator which uses analytical integrals for fast and accurate
time-domain analysis of the s-parameter package and channel models.
There is also a session at DesignCon which touches on this (session 5-WA2,
Wednesday, 9:40 AM). =20
I can also help you work with your silicon provider to develop the AMS
models, if that would be helpful.
=20
Gary
-----Original Message-----
From: si-list-bounce@xxxxxxxxxxxxx [mailto:si-list-bounce@xxxxxxxxxxxxx]
On Behalf Of Perry Qu
Sent: Monday, November 28, 2005 4:00 PM
To: 'steve weir'; 'si-list'
Subject: [SI-LIST] Re: Bit pattern for high speed serial link simulation
Steve:
Thanks for the suggestion. This is through encoder. I'm running a PRBS15
pattern simulation right now (already a week) and I do noticed closure of
eye mask due to the pattern. May try an even longer pattern but the
simulation in hspice is just too slow. Will probably look into Allegro PCB
SI channel analysis tool.
Regards
Perry
=20
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=20
Perry Qu=20
Design & Qualification, Alcatel Canada=20
600 March Road, Ottawa ON, K2K 2E6=20
DID: 613-7846720 Fax: 613-5993642=20
Email: perry.qu@xxxxxxxxxxx=20
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=20
-----Original Message-----
From: steve weir [mailto:weirsi@xxxxxxxxxx]
Sent: Monday, November 28, 2005 4:26 PM
To: Perry.Qu@xxxxxxxxxxx; si-list
Subject: Re: [SI-LIST] Bit pattern for high speed serial link simulation
Perry, if you are bypassing the encoder/decoder, then PRBS7 generates
sufficient run-length. If you are driving the encoder, you want a run
length > 15, so PRBS21 or PRBS31 would be a better choice.
Steve.
At 03:21 PM 11/28/2005 -0500, Perry Qu wrote:
>Hi,
>
>What will be a realistic bit pattern to use for simulation of a
>serial=20 link
>(3Gbps) with 8B/10B encoding ? Right now I used PRBS7 pattern but
>I'm=20 not sure whether it captured the worst case pattern compared
>to=20 reality, where the live data traffic is a lot more random. 8B/10B
>has a
>run length of 5 but if it's fed with say a PRBS31 bit stream, will I=20
>get more spectrum peaks than just a pure PRBS7 pattern without encoding
>which repeat itself every
>127 bits ?
>
>Thanks
>
>Perry
>
>=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3
>D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D
>
>Perry Qu
>
>Design & Qualification, Alcatel Canada
>
>600 March Road, Ottawa ON, K2K 2E6
>
>DID: 613-7846720 Fax: 613-5993642
>
>Email: perry.qu@xxxxxxxxxxx
>
>=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3
>D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D
>
>
>
>
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