[SI-LIST] Re: A question about XTK
- From: "Perry Qu" <Perry.Qu@xxxxxxxxxxx>
- To: "si-list" <si-list@xxxxxxxxxxxxx>
- Date: 19 Nov 2002 09:31:46 -0500
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
>
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--
Perry Qu
SDN D & Q | 600 March Road
Alcatel Canada | Ottawa, ON K2K 2E6, Canada
DID: (613) 7846720 | FAX: (613) 5993642
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