[SI-LIST] Re: HSPICE - adding jitter to ethernet serial link
- From: steve weir <weirsi@xxxxxxxxxx>
- To: hassan@xxxxxxxx, si-list@xxxxxxxxxxxxx
- Date: Thu, 16 Feb 2006 13:00:53 -0800
Hassan, thanks. I am just going to try and summarize. If I don't
have this right, please correct me:
The HSPICE method for APPROXIMATING effects of RJ to a truncated
sigma value is injection of uncorrelated, or weakly correlated pseudo
random timing variation into the model.
The real time modelled only needs to be long enough to insure the
correlation between data pattern and the pseudo RJ weak.
The resulting eye closure will be close enough to what we would see
in the real world to be useful.
Best Regards,
Steve.
At 12:15 PM 2/16/2006, Hassan O. Ali wrote:
>Steve,
>
>Please see my thoughts inline below.
>
>Best regards.
>
>Hassan.
>
>On Feb 16, steve weir <weirsi@xxxxxxxxxx> wrote:
> >
> > Hassan, thanks for the clarification. Now, what I would like to
> > concentrate on is the notion of RJ injection in the simulaton
> from two aspects:
> >
> > 1) How it can be done and
> > 2) How useful could it be
> >
> > On the how, I think:
> >
> > 1) We have to modulate the timing of the transmit timing source, the
> > path delay, or the receive slicer. I don't think we get there by
> > making long PRBS sequences.
>
>Yes, the source pulse train is randomly changed by the jitter.
>
> > 2) That we never really get RJ because it is PRBS.
> > Your thoughts?
>
>Doesn't have to be PRBS - it can be any pattern the interface is
>supposed to work with.
>The RJ is added, in random amounts, to advance or delay each rising
>or falling edge or
>the source. The pattern itself, and the source pulse distortion that
>results from the
>addition of the source RJ (and DJ), will allow for the evaluation of
>the pattern channel-
>dependency (i.e. ISI). I think that is a reasonable way of including
>RJ in the jitter
>analysis. Of course, you may disagree.
>
> > On the usefulness, I think
> >
> > It is dubious, because we can never get enough simulation cycles to
> > see the RJ as it would really occur unless it is extreme. At best, I
> > think we could create an eye for visual purposes that is compressed
> > by applying whatever sigma we want to the RJ and convolving that peak
> > value into a dummy jitter source. I am not sure how useful that
> > might be. that is why I think mathematically working RJ in at post
> > process makes more sense.
> >
> > Your thoughts?
>
>Many successful high-speed links have been designed using this
>(HSPICE simulation)
>method. As I mentioned before, the generation of the worstcase
>far-end eye may not need
>many simulation cycles. But of course there are more rigorous
>methods that can be used
>for the same purpose. However, when the only models you have are the
>driver and receiver
>HSPICE/IBIS models and the link model in S-parameter (or other)
>format, the HSPICE
>simulation approach maybe sufficiently used especially if you like simplicity.
>
> >
> > Best Regards,
> >
> >
> > Steve
> > At 07:30 AM 2/16/2006, Hassan O. Ali wrote:
> >
> > >Steve,
> > >
> > >So that we're all on the same page, let me summarize what I've
> said so far:
> > >
> > >- In an HSPICE simulation you can inject into a link a PWL stimulus
> > >that includes source
> > >RJ and DJ, and obtain at the end of your link, a time-domain output
> > >eye-diagram that
> > >includes the effects of source RJ and DJ as well as the DJ
> > >introduced by the link. I've
> > >not suggested that such a simulation will give you a BER number.
> > >
> > >- With a known data pattern, and given BER requirements, I think it
> > >is possible to
> > >obtain the worst-case output eye-pattern (i.e. the worst-case
> > >eye-closure) through
> > >HSPICE simulation with just a few bits - i.e. not through days of
> > >simulation. I
> > >suggested that the simulation may need strategic assignment of
> > >maximum RJ on the bit
> > >stream. Of course that needs to be confirmed.
> > >
> > >Best regards.
> > >
> > >Hassan.
> > >
> > >
> > >On Feb 15, steve weir <weirsi@xxxxxxxxxx> wrote:
> > > >
> > > > Hassan, using a PN pattern to emulate RJ doesn't make sense to
> > > > me. In my perverse universe, lots of post processing is needed to
> > > > convert an HSPICE result into an estimate of BER, most notably an
> > > > accounting for the effects of RJ. Given the paradox that we desire
> > > > both: near zero BER, and accurate BER values, I think it is hard
> > > > enough to get valid probability stats on systems running full
> > > > speed. In simulation, I see it as impossible outside of
> > > > post-processing. And yes, accurate RJ numbers are critical to doing
> > > > that post-processing reasonably well.
> > > >
> > > > Are you aware of an accurate way to get BERs based on the
> > > > probabilistic effects without post processing? If you do, can you
> > > > share a description?
> > > >
> > > > Regards,
> > > >
> > > >
> > > > Steve.
> > > > At 06:00 PM 2/15/2006, Hassan O. Ali wrote:
> > > > >Chris,
> > > > >
> > > > >There are so many ways to skin a cat!
> > > > >
> > > > >High-speed chip makers do specify Tx RJ and DJ (jitter generation)
> > > > >numbers and also Rx
> > > > >jitter tolerance numbers. As a matter of fact, various high-speed
> > > > >interface standards
> > > > >call for the specification of those jitter characteristics. System
> > > > >designers use those
> > > > >numbers while evaluating the performance over their links.
> > > > >
> > > > >The jitter tolerance number is a measure of the Rx performance. An
> > > > >HSPICE simulation may
> > > > >not easily give you a BER number but it gives you an eye-pattern at
> > > > >the end of the link
> > > > >which you can use to determine if it meets the far-end eye-pattern
> > > > >expected by the
> > > > >receiver.
> > > > >
> > > > >Best regards.
> > > > >
> > > > >Hassan.
> > > > >
> > > > >
> > > > >On Feb 15, "Chris Cheng" <Chris.Cheng@xxxxxxxxxxxx> wrote:
> > > > > >
> > > > > > I am a firm believer of divide and conquer. The same
> reason you don't =
> > > > > > simulate your Tx/Rx PLL jitter while you are doing your
> prop delay =
> > > > > > analysis. They are separate components of a BERT budget. You
> > > are asking =
> > > > > > for trouble and unnecessary complexity if you try to do
> it all in the =
> > > > > > same time in SPICE or IBIS.
> > > > > > Besides, who really knows what his Tx Rj is anyways ?
> > > > > > Further more, without knowing your CDR jitter transfer, how
> > > do you know =
> > > > > > the BERT is really that bad AFTER your CDR recover the
> clock that is =
> > > > > > used to capture your data ?
> > > > > >
> > > > > > -----Original Message-----
> > > > > > From: si-list-bounce@xxxxxxxxxxxxx
> > > > > > [mailto:si-list-bounce@xxxxxxxxxxxxx]On Behalf Of Hassan O. Ali
> > > > > > Sent: Wednesday, February 15, 2006 3:05 PM
> > > > > > To: si-list@xxxxxxxxxxxxx
> > > > > > Subject: [SI-LIST] Re: HSPICE - adding jitter to ethernet
> serial link
> > > > > >
> > > > > >
> > > > > >
> > > > > > I don't know how the two methods would compare. What do you think?
> > > > > >
> > > > > > Best regards.
> > > > > >
> > > > > > Hassan.
> > > > > >
> > > > > >
> > > > > > On Feb 15, "Chris Cheng" <Chris.Cheng@xxxxxxxxxxxx> wrote:
> > > > > > >=20
> > > > > > > If the channel is indeed linear, what's the difference
> between not =
> > > > > > doing =3D
> > > > > > > Rj at all and simulate your PRBS, get the minium eye
> > > opening (Dj) then =
> > > > > > =3D
> > > > > > > add a seperate Rj convoluted with impulse response ?=3D20
> > > > > > >=20
> > > > > > > -----Original Message-----
> > > > > > > From: si-list-bounce@xxxxxxxxxxxxx
> > > > > > > [mailto:si-list-bounce@xxxxxxxxxxxxx]On Behalf Of Hassan O. Ali
> > > > > > > Sent: Wednesday, February 15, 2006 2:18 PM
> > > > > > > To: si-list@xxxxxxxxxxxxx
> > > > > > > Subject: [SI-LIST] Re: HSPICE - adding jitter to
> ethernet serial link
> > > > > > >=20
> > > > > > >=20
> > > > > > > Chris,
> > > > > > >=20
> > > > > > > The HSPICE approach allows you to see the effect of source
> > > RJ as well =
> > > > > > as =3D
> > > > > > > both source and=3D20
> > > > > > > channel-induced DJ. I think the convolution you're referring to =
> > > > > > doesn't =3D
> > > > > > > consider source=3D20
> > > > > > > DJ.
> > > > > > >=20
> > > > > > > I'm thinking out loud here, but I think in simulation,
> if the input =
> > > > > > =3D
> > > > > > > pattern is known, it=3D20
> > > > > > > doesn't need many bits to simulate a case of worst-case
> > > jitter (or =3D
> > > > > > > eye-opening) for a=3D20
> > > > > > > particular BER requirement.=3D20
> > > > > > >=20
> > > > > > > For example, for a BER of 10E-14, the max pk-to-pk RJ is
> > > approx. 15.3 =
> > > > > > =3D
> > > > > > > times RJ(rms). To=3D20
> > > > > > > simulate the worst-case total jitter, In the PWL source you
> > > could use =
> > > > > > =3D
> > > > > > > that amount of max=3D20
> > > > > > > pk-to-pk RJ right at the bit where you expect the
> > > worst-case ISI e.g. =
> > > > > > at =3D
> > > > > > > a lone "1" that=3D20
> > > > > > > follows a long run of 0's. In other words, I think you can =
> > > > > > strategically =3D
> > > > > > > define source=3D20
> > > > > > > RJ and DJ amounts along your bit stream and cover the entire =
> > > > > > eye-pattern =3D
> > > > > > > voltage/time=3D20
> > > > > > > bounds in just a few bits. Anyone out there has done this?
> > > > > > >=20
> > > > > > > Best regards.
> > > > > > >=20
> > > > > > > Hassan.
> > > > > > >=20
> > > > > > >=20
> > > > > > >=20
> > > > > > > On Feb 15, "Chris Cheng" <Chris.Cheng@xxxxxxxxxxxx> wrote:
> > > > > > > >=3D20
> > > > > > > > If your channel response is linear. How does a
> separate analysis =
> > > > > > with =3D
> > > > > > > Rj only=3D20
> > > > > > > convoluted with the impulse response of the channel
> different from =
> > > > > > what =3D
> > > > > > > you are doing ?=3D20
> > > > > > > How many bit do you think is need to simulate in SPICE
> a BERT of =
> > > > > > 10e-14 =3D
> > > > > > > or -18 ?
> > > > > > > > =3D20
> > > > > > > > ________________________________
> > > > > > > >=3D20
> > > > > > > > From: si-list-bounce@xxxxxxxxxxxxx on behalf of Hassan O. Ali
> > > > > > > > Sent: Wed 2/15/2006 9:02 AM
> > > > > > > > To: si-list@xxxxxxxxxxxxx
> > > > > > > > Subject: [SI-LIST] Re: HSPICE - adding jitter to
> ethernet serial =
> > > > > > link
> > > > > > > >=3D20
> > > > > > > >=3D20
> > > > > > > >=3D20
> > > > > > > > A piece-wise linear (PWL) source implemented as below in
> > > an HSPICE =
> > > > > > =3D
> > > > > > > subcircuit may be
> > > > > > > > used to simulate RJ and DJ effects on the output.
> > > > > > > >=3D20
> > > > > > > > The total jitter (J) factors (e.g. 0.512, 0.221, etc.) in
> > > this case =
> > > > > > =3D
> > > > > > > were generated with
> > > > > > > > a random number generator. The bit pattern is random but
> > > is supposed =
> > > > > > =3D
> > > > > > > to mimic an 8B/10B
> > > > > > > > encoding where the maximum run-length (maximum number of
> > > consecutive =
> > > > > > =3D
> > > > > > > 1's or 0's) is 5.
> > > > > > > > The pattern length was arbitrarily chosen as 160 bits.
> > > > > > > >=3D20
> > > > > > > > Mind you, this is just one arbitrary way of including
> DJ and RJ =3D
> > > > > > > effects. I'm sure more
> > > > > > > > elaborate ways exist.
> > > > > > > >=3D20
> > > > > > > > Best regards.
> > > > > > > >=3D20
> > > > > > > > Hassan.
> > > > > > > >=3D20
> > > > > > > >=3D20
> > > > > > > > ************************************************
> > > > > > > > * HSPICE PWL voltage source
> > > > > > > > * Parameter description:
> > > > > > > > * TR - Rise/Fall time of the PWL source
> > > > > > > > * UI - Unit Interval time (Bit width =3D3D 1/BitRate)
> > > > > > > > * HI - Voltage value representing bit "1"
> > > > > > > > * LO - Voltage value representing bit "0"
> > > > > > > > * JD - Peak-to-peak deterministic jitter
> > > > > > > > * JR - Peak-to-peak random jitter
> > > > > > > > ************************************************
> > > > > > > > .SUBCKT pwl_source node1 node2
> > > > > > > > +TR=3D3DTRval UI=3D3DUIval HI=3D3DHIval LO=3D3DLOval
> > > > > > > > +JD=3D3DJDval JR=3D3DJRval
> > > > > > > > .param J=3D3D'(JD+JR/2)'
> > > > > > > > vsrc node1 node2 PWL
> > > > > > > > + 0.0 'HI', '0.512*J+UI*1' 'HI',
> > > > > > > > + '0.512*J+UI*1+TR' 'LO', '0.221*J+UI*2' 'LO',
> > > > > > > > + '0.221*J+UI*2+TR' 'LO', '0.868*J+UI*3' 'LO',
> > > > > > > > + '0.868*J+UI*3+TR' 'LO', '0.358*J+UI*4' 'LO',
> > > > > > > > + '0.358*J+UI*4+TR' 'LO', '0.379*J+UI*5' 'LO',
> > > > > > > > + '0.379*J+UI*5+TR' 'HI', '-0.003*J+UI*6' 'HI',
> > > > > > > > + '-0.003*J+UI*6+TR' 'LO', '0.2*J+UI*7' 'LO',
> > > > > > > > + '0.2*J+UI*7+TR' 'LO', '0.238*J+UI*8' 'LO',
> > > > > > > > + '0.238*J+UI*8+TR' 'LO', '0.197*J+UI*9' 'LO',
> > > > > > > > + '0.197*J+UI*9+TR' 'LO', '-0.424*J+UI*10' 'LO',
> > > > > > > > + '-0.424*J+UI*10+TR' 'HI', '-0.608*J+UI*11' 'HI',
> > > > > > > > + '-0.608*J+UI*11+TR' 'HI', '-0.47*J+UI*12' 'HI',
> > > > > > > > + '-0.47*J+UI*12+TR' 'LO', '-0.124*J+UI*13' 'LO',
> > > > > > > > + '-0.124*J+UI*13+TR' 'LO', '-0.094*J+UI*14' 'LO',
> > > > > > > > + '-0.094*J+UI*14+TR' 'LO', '-0.657*J+UI*15' 'LO',
> > > > > > > > + '-0.657*J+UI*15+TR' 'HI', '0.48*J+UI*16' 'HI',
> > > > > > > > + '0.48*J+UI*16+TR' 'LO', '-0.052*J+UI*17' 'LO',
> > > > > > > > + '-0.052*J+UI*17+TR' 'LO', '0.208*J+UI*18' 'LO',
> > > > > > > > + '0.208*J+UI*18+TR' 'HI', '-0.15*J+UI*19' 'HI',
> > > > > > > > + '-0.15*J+UI*19+TR' 'HI', '-0.097*J+UI*20' 'HI',
> > > > > > > > + '-0.097*J+UI*20+TR' 'LO', '0.089*J+UI*21' 'LO',
> > > > > > > > + '0.089*J+UI*21+TR' 'LO', '-0.535*J+UI*22' 'LO',
> > > > > > > > + '-0.535*J+UI*22+TR' 'LO', '0.096*J+UI*23' 'LO',
> > > > > > > > + '0.096*J+UI*23+TR' 'LO', '-0.433*J+UI*24' 'LO',
> > > > > > > > + '-0.433*J+UI*24+TR' 'LO', '0.603*J+UI*25' 'LO',
> > > > > > > > + '0.603*J+UI*25+TR' 'LO', '-0.119*J+UI*26' 'LO',
> > > > > > > > + '-0.119*J+UI*26+TR' 'HI', '-0.847*J+UI*27' 'HI',
> > > > > > > > + '-0.847*J+UI*27+TR' 'HI', '-0.234*J+UI*28' 'HI',
> > > > > > > > + '-0.234*J+UI*28+TR' 'HI', '-0.056*J+UI*29' 'HI',
> > > > > > > > + '-0.056*J+UI*29+TR' 'LO', '-0.535*J+UI*30' 'LO',
> > > > > > > > + '-0.535*J+UI*30+TR' 'LO', '-0.564*J+UI*31' 'LO',
> > > > > > > > + '-0.564*J+UI*31+TR' 'HI', '-0.191*J+UI*32' 'HI',
> > > > > > > > + '-0.191*J+UI*32+TR' 'LO', '0.16*J+UI*33' 'LO',
> > > > > > > > + '0.16*J+UI*33+TR' 'LO', '-0.552*J+UI*34' 'LO',
> > > > > > > > + '-0.552*J+UI*34+TR' 'LO', '0.277*J+UI*35' 'LO',
> > > > > > > > + '0.277*J+UI*35+TR' 'HI', '-0.491*J+UI*36' 'HI',
> > > > > > > > + '-0.491*J+UI*36+TR' 'LO', '0.463*J+UI*37' 'LO',
> > > > > > > > + '0.463*J+UI*37+TR' 'LO', '-0.166*J+UI*38' 'LO',
> > > > > > > > + '-0.166*J+UI*38+TR' 'HI', '-0.592*J+UI*39' 'HI',
> > > > > > > > + '-0.592*J+UI*39+TR' 'HI', '0.667*J+UI*40' 'HI',
> > > > > > > > + '0.667*J+UI*40+TR' 'LO', '-0.296*J+UI*41' 'LO',
> > > > > > > > + '-0.296*J+UI*41+TR' 'LO', '-0.11*J+UI*42' 'LO',
> > > > > > > > + '-0.11*J+UI*42+TR' 'HI', '-0.608*J+UI*43' 'HI',
> > > > > > > > + '-0.608*J+UI*43+TR' 'HI', '-0.351*J+UI*44' 'HI',
> > > > > > > > + '-0.351*J+UI*44+TR' 'LO', '0.818*J+UI*45' 'LO',
> > > > > > > > + '0.818*J+UI*45+TR' 'HI', '-0.365*J+UI*46' 'HI',
> > > > > > > > + '-0.365*J+UI*46+TR' 'LO', '0.201*J+UI*47' 'LO',
> > > > > > > > + '0.201*J+UI*47+TR' 'LO', '-0.247*J+UI*48' 'LO',
> > > > > > > > + '-0.247*J+UI*48+TR' 'LO', '0.446*J+UI*49' 'LO',
> > > > > > > > + '0.446*J+UI*49+TR' 'HI', '0.329*J+UI*50' 'HI',
> > > > > > > > + '0.329*J+UI*50+TR' 'LO', '0.706*J+UI*51' 'LO',
> > > > > > > > + '0.706*J+UI*51+TR' 'HI', '-0.165*J+UI*52' 'HI',
> > > > > > > > + '-0.165*J+UI*52+TR' 'LO', '0.302*J+UI*53' 'LO',
> > > > > > > > + '0.302*J+UI*53+TR' 'LO', '0.03*J+UI*54' 'LO',
> > > > > > > > + '0.03*J+UI*54+TR' 'HI', '0.152*J+UI*55' 'HI',
> > > > > > > > + '0.152*J+UI*55+TR' 'LO', '-0.255*J+UI*56' 'LO',
> > > > > > > > + '-0.255*J+UI*56+TR' 'HI', '-0.237*J+UI*57' 'HI',
> > > > > > > > + '-0.237*J+UI*57+TR' 'LO', '0.014*J+UI*58' 'LO',
> > > > > > > > + '0.014*J+UI*58+TR' 'LO', '0.64*J+UI*59' 'LO',
> > > > > > > > + '0.64*J+UI*59+TR' 'LO', '-0.162*J+UI*60' 'LO',
> > > > > > > > + '-0.162*J+UI*60+TR' 'LO', '0.311*J+UI*61' 'LO',
> > > > > > > > + '0.311*J+UI*61+TR' 'LO', '0.33*J+UI*62' 'LO',
> > > > > > > > + '0.33*J+UI*62+TR' 'LO', '-0.301*J+UI*63' 'LO',
> > > > > > > > + '-0.301*J+UI*63+TR' 'HI', '-0.513*J+UI*64' 'HI',
> > > > > > > > + '-0.513*J+UI*64+TR' 'LO', '0.102*J+UI*65' 'LO',
> > > > > > > > + '0.102*J+UI*65+TR' 'LO', '-0.695*J+UI*66' 'LO',
> > > > > > > > + '-0.695*J+UI*66+TR' 'LO', '-0.308*J+UI*67' 'LO',
> > > > > > > > + '-0.308*J+UI*67+TR' 'LO', '-0.444*J+UI*68' 'LO',
> > > > > > > > + '-0.444*J+UI*68+TR' 'LO', '0.387*J+UI*69' 'LO',
> > > > > > > > + '0.387*J+UI*69+TR' 'LO', '-0.031*J+UI*70' 'LO',
> > > > > > > > + '-0.031*J+UI*70+TR' 'HI', '-0.599*J+UI*71' 'HI',
> > > > > > > > + '-0.599*J+UI*71+TR' 'LO', '-0.071*J+UI*72' 'LO',
> > > > > > > > + '-0.071*J+UI*72+TR' 'LO', '0.077*J+UI*73' 'LO',
> > > > > > > > + '0.077*J+UI*73+TR' 'HI', '0.663*J+UI*74' 'HI',
> > > > > > > > + '0.663*J+UI*74+TR' 'HI', '-0.526*J+UI*75' 'HI',
> > > > > > > > + '-0.526*J+UI*75+TR' 'LO', '0*J+UI*76' 'LO',
> > > > > > > > + '0*J+UI*76+TR' 'LO', '0.193*J+UI*77' 'LO',
> > > > > > > > + '0.193*J+UI*77+TR' 'LO', '0.479*J+UI*78' 'LO',
> > > > > > > > + '0.479*J+UI*78+TR' 'LO', '-0.055*J+UI*79' 'LO',
> > > > > > > > + '-0.055*J+UI*79+TR' 'HI', '0.161*J+UI*80' 'HI',
> > > > > > > > + '0.161*J+UI*80+TR' 'LO', '0.404*J+UI*81' 'LO',
> > > > > > > > + '0.404*J+UI*81+TR' 'LO', '-0.249*J+UI*82' 'LO',
> > > > > > > > + '-0.249*J+UI*82+TR' 'HI', '-0.255*J+UI*83' 'HI',
> > > > > > > > + '-0.255*J+UI*83+TR' 'LO', '-0.668*J+UI*84' 'LO',
> > > > > > > > + '-0.668*J+UI*84+TR' 'HI', '-0.481*J+UI*85' 'HI',
> > > > > > > > + '-0.481*J+UI*85+TR' 'LO', '0.553*J+UI*86' 'LO',
> > > > > > > > + '0.553*J+UI*86+TR' 'LO', '0.16*J+UI*87' 'LO',
> > > > > > > > + '0.16*J+UI*87+TR' 'HI', '0.392*J+UI*88' 'HI',
> > > > > > > > + '0.392*J+UI*88+TR' 'LO', '-0.056*J+UI*89' 'LO',
> > > > > > > > + '-0.056*J+UI*89+TR' 'LO', '0.267*J+UI*90' 'LO',
> > > > > > > > + '0.267*J+UI*90+TR' 'LO', '0.384*J+UI*91' 'LO',
> > > > > > > > + '0.384*J+UI*91+TR' 'LO', '0.79*J+UI*92' 'LO',
> > > > > > > > + '0.79*J+UI*92+TR' 'LO', '-0.734*J+UI*93' 'LO',
> > > > > > > > + '-0.734*J+UI*93+TR' 'LO', '-0.006*J+UI*94' 'LO',
> > > > > > > > + '-0.006*J+UI*94+TR' 'HI', '-0.01*J+UI*95' 'HI',
> > > > > > > > + '-0.01*J+UI*95+TR' 'HI', '-0.039*J+UI*96' 'HI',
> > > > > > > > + '-0.039*J+UI*96+TR' 'LO', '0.648*J+UI*97' 'LO',
> > > > > > > > + '0.648*J+UI*97+TR' 'HI', '0.099*J+UI*98' 'HI',
> > > > > > > > + '0.099*J+UI*98+TR' 'LO', '0.409*J+UI*99' 'LO',
> > > > > > > > + '0.409*J+UI*99+TR' 'HI', '0.808*J+UI*100' 'HI',
> > > > > > > > + '0.808*J+UI*100+TR' 'HI', '0.458*J+UI*101' 'HI',
> > > > > > > > + '0.458*J+UI*101+TR' 'LO', '0.709*J+UI*102' 'LO',
> > > > > > > > + '0.709*J+UI*102+TR' 'LO', '0.489*J+UI*103' 'LO',
> > > > > > > > + '0.489*J+UI*103+TR' 'HI', '0.309*J+UI*104' 'HI',
> > > > > > > > + '0.309*J+UI*104+TR' 'LO', '0.637*J+UI*105' 'LO',
> > > > > > > > + '0.637*J+UI*105+TR' 'LO', '0.225*J+UI*106' 'LO',
> > > > > > > > + '0.225*J+UI*106+TR' 'LO', '-0.052*J+UI*107' 'LO',
> > > > > > > > + '-0.052*J+UI*107+TR' 'HI', '-0.1*J+UI*108' 'HI',
> > > > > > > > + '-0.1*J+UI*108+TR' 'HI', '0.288*J+UI*109' 'HI',
> > > > > > > > + '0.288*J+UI*109+TR' 'LO', '-0.219*J+UI*110' 'LO',
> > > > > > > > + '-0.219*J+UI*110+TR' 'LO', '-0.129*J+UI*111' 'LO',
> > > > > > > > + '-0.129*J+UI*111+TR' 'LO', '0.035*J+UI*112' 'LO',
> > > > > > > > + '0.035*J+UI*112+TR' 'LO', '0.131*J+UI*113' 'LO',
> > > > > > > > + '0.131*J+UI*113+TR' 'HI', '-0.23*J+UI*114' 'HI',
> > > > > > > > + '-0.23*J+UI*114+TR' 'LO', '0.24*J+UI*115' 'LO',
> > > > > > > > + '0.24*J+UI*115+TR' 'LO', '0.684*J+UI*116' 'LO',
> > > > > > > > + '0.684*J+UI*116+TR' 'LO', '0.027*J+UI*117' 'LO',
> > > > > > > > + '0.027*J+UI*117+TR' 'HI', '0.351*J+UI*118' 'HI',
> > > > > > > > + '0.351*J+UI*118+TR' 'LO', '-0.562*J+UI*119' 'LO',
> > > > > > > > + '-0.562*J+UI*119+TR' 'LO', '0.831*J+UI*120' 'LO',
> > > > > > > > + '0.831*J+UI*120+TR' 'LO', '-0.524*J+UI*121' 'LO',
> > > > > > > > + '-0.524*J+UI*121+TR' 'HI', '-0.041*J+UI*122' 'HI',
> > > > > > > > + '-0.041*J+UI*122+TR' 'HI', '0.675*J+UI*123' 'HI',
> > > > > > > > + '0.675*J+UI*123+TR' 'HI', '-0.035*J+UI*124' 'HI',
> > > > > > > > + '-0.035*J+UI*124+TR' 'HI', '0.083*J+UI*125' 'HI',
> > > > > > > > + '0.083*J+UI*125+TR' 'LO', '-0.247*J+UI*126' 'LO',
> > > > > > > > + '-0.247*J+UI*126+TR' 'HI', '-0.372*J+UI*127' 'HI',
> > > > > > > > + '-0.372*J+UI*127+TR' 'LO', '-0.44*J+UI*128' 'LO',
> > > > > > > > + '-0.44*J+UI*128+TR' 'HI', '-0.861*J+UI*129' 'HI',
> > > > > > > > + '-0.861*J+UI*129+TR' 'LO', '0.162*J+UI*130' 'LO',
> > > > > > > > + '0.162*J+UI*130+TR' 'HI', '-0.228*J+UI*131' 'HI',
> > > > > > > > + '-0.228*J+UI*131+TR' 'HI', '0.606*J+UI*132' 'HI',
> > > > > > > > + '0.606*J+UI*132+TR' 'HI', '-0.002*J+UI*133' 'HI',
> > > > > > > > + '-0.002*J+UI*133+TR' 'LO', '0.385*J+UI*134' 'LO',
> > > > > > > > + '0.385*J+UI*134+TR' 'HI', '0.012*J+UI*135' 'HI',
> > > > > > > > + '0.012*J+UI*135+TR' 'LO', '0.14*J+UI*136' 'LO',
> > > > > > > > + '0.14*J+UI*136+TR' 'LO', '-0.286*J+UI*137' 'LO',
> > > > > > > > + '-0.286*J+UI*137+TR' 'HI', '-0.124*J+UI*138' 'HI',
> > > > > > > > + '-0.124*J+UI*138+TR' 'HI', '0.132*J+UI*139' 'HI',
> > > > > > > > + '0.132*J+UI*139+TR' 'HI', '0.65*J+UI*140' 'HI',
> > > > > > > > + '0.65*J+UI*140+TR' 'LO', '0.422*J+UI*141' 'LO',
> > > > > > > > + '0.422*J+UI*141+TR' 'HI', '-0.173*J+UI*142' 'HI',
> > > > > > > > + '-0.173*J+UI*142+TR' 'HI', '-0.701*J+UI*143' 'HI',
> > > > > > > > + '-0.701*J+UI*143+TR' 'HI', '0.674*J+UI*144' 'HI',
> > > > > > > > + '0.674*J+UI*144+TR' 'LO', '-0.063*J+UI*145' 'LO',
> > > > > > > > + '-0.063*J+UI*145+TR' 'LO', '0.697*J+UI*146' 'LO',
> > > > > > > > + '0.697*J+UI*146+TR' 'HI', '-0.464*J+UI*147' 'HI',
> > > > > > > > + '-0.464*J+UI*147+TR' 'HI', '0.241*J+UI*148' 'HI',
> > > > > > > > + '0.241*J+UI*148+TR' 'LO', '0.158*J+UI*149' 'LO',
> > > > > > > > + '0.158*J+UI*149+TR' 'HI', '0.725*J+UI*150' 'HI',
> > > > > > > > + '0.725*J+UI*150+TR' 'LO', '-0.715*J+UI*151' 'LO',
> > > > > > > > + '-0.715*J+UI*151+TR' 'HI', '0.379*J+UI*152' 'HI',
> > > > > > > > + '0.379*J+UI*152+TR' 'HI', '-0.341*J+UI*153' 'HI',
> > > > > > > > + '-0.341*J+UI*153+TR' 'LO', '0.387*J+UI*154' 'LO',
> > > > > > > > + '0.387*J+UI*154+TR' 'HI', '-0.158*J+UI*155' 'HI',
> > > > > > > > + '-0.158*J+UI*155+TR' 'LO', '0.637*J+UI*156' 'LO',
> > > > > > > > + '0.637*J+UI*156+TR' 'LO', '-0.883*J+UI*157' 'LO',
> > > > > > > > + '-0.883*J+UI*157+TR' 'LO', '-0.083*J+UI*158' 'LO',
> > > > > > > > + '-0.083*J+UI*158+TR' 'HI', '-0.087*J+UI*159' 'HI',
> > > > > > > > + '-0.087*J+UI*159+TR' 'HI', '0.573*J+UI*160' 'HI',
> > > > > > > > .ends
> > > > > > > >=3D20
> > > > > > > >=3D20
> > > > > > > >=3D20
> > > > > > > >=3D20
> > > > > > > >=3D20
> > > > > > > > On Feb 15, "Chris Cheng" <Chris.Cheng@xxxxxxxxxxxx> wrote:
> > > > > > > > >
> > > > > > > > > May be its just me but Rj only makes sense when you are
> > > trying to =
> > > > > > =3D
> > > > > > > extract a BERT=3D20
> > > > > > > curve
> > > > > > > > which seems to be a MATLAB job.
> > > > > > > > > If you have your Tx Rj, channel model and jitter
> > > transfer of your =
> > > > > > =3D
> > > > > > > CDR, the rest of=3D20
> > > > > > > the
> > > > > > > > work is straight forward.
> > > > > > > > > >
> > > > > > > > > >
> > > > > > > > > > At 10:40 AM 2/7/2006 -0800, Ali Burney wrote:
> > > > > > > > > >=3D20
> > > > > > > > > >> Hi,
> > > > > > > > > >>
> > > > > > > > > >>
> > > > > > > > > >> I am running gigabit Ethernet link simulation using
> > > HSPICE and =
> > > > > > =3D
> > > > > > > have a=3D3D20
> > > > > > > > > >> question on adding jitter to the transmitted data.
> > > Is there any =
> > > > > > =3D
> > > > > > > way to=3D3D20
> > > > > > > > > >> add Gaussian jitter to the transmitted data? I know
> > > that tools =
> > > > > > =3D
> > > > > > > such as
> > > > > > > > > >> =3D20
> > > > > > > > > >
> > > > > > > > > >=3D20
> > > > > > > > > >> Hyperlynx allow you to add transmit jitter.
> > > > > > > > > >>
> > > > > > > > > >>
> > > > > > > > > >>
> > > > > > > > > >> Thanks and best regards,
> > > > > > > > > >>
> > > > > > > > > >>
> > > > > > > > > >>
> > > > > > > > > >> A Burney
> > > > > > > >
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Other related posts:
