[SI-LIST] Re: SSN
- From: Bill Owsley <wdowsley@xxxxxxxxx>
- To: a.ingraham@xxxxxxxx, si-list <si-list@xxxxxxxxxxxxx>
- Date: Sun, 8 Jul 2007 19:24:12 -0700 (PDT)
SSN that occurs just once and shuts the system down with some sort of problem
is not acceptable to the customer and consequently to system supplier. But
since it does happen often enough to work on, most of the time design of the
PDS will take care of most (hopefully all) of the problems. ps. assuming SSN
is simultaneous switching noise.
Andrew Ingraham <a.ingraham@xxxxxxxx> wrote: > 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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