Re: 8b/10b and EMI
Hi Dan,
this was actually not my proposal, but apparently (I heard this
from Pat Thaler and Dave cunnigham mentioned it in a recent email), this
is being used in IEEE 1394b, and also may be used in infiniband. I
don't know how the idles are treated (as opposed to data).
Regards,
Kamran
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"DOVE,DANIEL J (HP-Roseville,ex1)" wrote:
>
> Hi Kamran,
>
> I have to confess, I am not up on the scrambled 8B10B proposal
> so I will raise this question. If you pre-scramble the data, how
> do you pre-scramble the IDLE?
>
> I believe that scrambling data is unnecessary as the FCC tests
> allow you to send random data during your tests. However, they
> also require you to operate in a likely mode which is a totally
> idle system. Does the IDLE state randomize the 8B10B code as well?
>
> Thanks,
>
> Dan
>
> > From: Kameran Azadet [mailto:ka@lucent.com]
> > Hi Rick,
> >
> > thanks for your response below, and I agree with you
> > guys that if
> > the decision is to stick to 8b/10b and use scrambling on the
> > top of it for
> > improving EMI, then scrambling should be prior to the block code. One
> > problem right now, is that this is not a proposal. Is it?
> >
> > Kamran
> >