[SI-LIST] Re: A question about XTK

Hi, Abe:

Tried the SIF file in one of my prelayout simulation and it works. Thanks a lot 
for your
tip.

Regards

Perry

Abe Riazi wrote:

> Hi Perry:
>
> To my understanding in order to produce an eye pattern providing comprehensive
> SI and timing data at the input of a receiver, it is often necessary to apply 
> a pseudo-
> random bit pattern at the output of the the driver.
>
> Use of .sif file with RANDOM option provides a simple way of accomplishing
> this objective  in XTK simulations.  The XTK/TLC manual states, " By using
> the RANDOM option, each edge defined by the PERIOD, %HIGH and CYCLES
> statements uses a random bit to determine if the edge will be rising or 
> falling
> The first cycle is always RISING then FALLING."
>
> It is interesting to note that the pattern produced by the .sif RANDOM
> feature repeats after a 2**32 cycles so that the bit pattern is pseudo-random.
>
> It should be also noted that sometimes a very large CYCLES number is
> desirable to achieve most accurate eye diagrams. In the example .sif file 
> given
> in my previous post, the number of CYCLES was set at 200. I have also
> used cycles numbers exceeding several thousands but the draw back
> is that simulation speed is then significantly reduced.
>
> Regards,
>
> Abe
>
> -----Original Message-----
> From:   Perry Qu [SMTP:Perry.Qu@xxxxxxxxxxx]
> Sent:   Monday, November 18, 2002 2:09 PM
> To:     'si-list@xxxxxxxxxxxxx'
> Subject:        [SI-LIST] Re: A question about XTK
>
> Thanks, Abe. What exactly is "Random" option trying to accomplish ? Does it 
> give us
> the random bit pattern ?
>
> I tried the "eye diagram" option in the new XTK/Eplanner on UNIX without 
> using SIF.
> The "eye" does not look as expected as what we have in HSPICE, where a 
> user-defined
> PRBS excitation is used.
>
> Regards
>
> Perry
>
> Abe Riazi wrote:
>
> >      Perry Qu  Wrote:
> >
> >        Hi, Abe:
> >
> > I'm interested to know how to do this in SIF also. Could you give a short
> > example showing the syntax in SIF to generate a pseudo-random bit pattern ? 
> > I'm
> > interested in this mainly for pre-layout simulation in scratchpad.
> >
> > THanks
> >
> > Perry
> >
> > >
> >
> > Hi Perry:
> >
> > Here is an example .sif file utilizing the RANDOM option:
> >
> > Netname PERIOD: 10 %HIGH 50 CYCLES: 200 RANDOM OFFSET: 0.0 JTTER: 0.0
> >
> > Using a recent Nutcracker version of XTK (on a Windows NT
> > platform),  I have been able to select any driver of the net and then
> > produce an eye pattern at the input of a desired receiver.  As noted in my
> > ea rlier post, the eye pattern can reveal information related to ringback, 
> > jiiter,
> > min/max slew rates, source synchronous timing, etc.
> >
> > Best Regards,
> >
> > Abe Riazi
> > ServerWorks
>
> ------------------------------------------------------------------
> To unsubscribe from si-list:
> si-list-request@xxxxxxxxxxxxx with 'unsubscribe' in the Subject field
>
> or to administer your membership from a web page, go to:
> http://www.freelists.org/webpage/si-list
>
> For help:
> si-list-request@xxxxxxxxxxxxx with 'help' in the Subject field
>
> List archives are viewable at:
>                 http://www.freelists.org/archives/si-list
> or at our remote archives:
>                 http://groups.yahoo.com/group/si-list/messages
> Old (prior to June 6, 2001) list archives are viewable at:
>                 http://www.qsl.net/wb6tpu
>

--
Perry Qu

SDN D & Q            |      600 March Road
Alcatel Canada       |      Ottawa, ON K2K 2E6, Canada

DID: (613) 7846720   |      FAX: (613) 5993642


------------------------------------------------------------------
To unsubscribe from si-list:
si-list-request@xxxxxxxxxxxxx with 'unsubscribe' in the Subject field

or to administer your membership from a web page, go to:
http://www.freelists.org/webpage/si-list

For help:
si-list-request@xxxxxxxxxxxxx with 'help' in the Subject field

List archives are viewable at:     
                http://www.freelists.org/archives/si-list
or at our remote archives:
                http://groups.yahoo.com/group/si-list/messages 
Old (prior to June 6, 2001) list archives are viewable at:
                http://www.qsl.net/wb6tpu

Other related posts: