FreeLists / si-list / [SI-LIST] Re: SSN

["Andrew Ingraham" <a.ingraham@xxxxxxxx>]

> As we know SSN is a infrequent probability affair

You may know it, but I don't know that one yet.  As far as I am concerned,
SSN is pretty much a guaranteed thing.  Take, for example, a 64-bit data bus
and there's a very real chance that all 64 lines may toggle low-to-high or
vice-versa several times a second.  Address and data busses tend to do that.

Given that it happens (you need to prove to me that it can't happen, i.e.,
parity/ECC pins, complementary pairs, or that it doesn't happen more than
once every few years), then I think you do need to evaluate the effects of
SSN.  Perhaps you can reduce the maximum number of simultaneous switchers,
but usually not by much.

I would say that you never can ignore SSN under the false pretense that it
is statistically infrequent, or that yesterday's design works OK so today's
should too.

Regards,
Andy


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