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Message
From: Rudolf Usselmann<rudi@a...>
Date: Thu Sep 9 08:57:52 CEST 2004
Subject: [oc] FPGA speed grade
On Thu, 2004-09-09 at 13:45, Dipak Modi wrote:
> Hi All,
>
> What does speed grade in FPGA part name signifies?
> Say xilinx part name: XC3S50 -4 PQ G 208 C, So how this -4 term is
> related with the FPGA speed?
>
> Thanks,
>
> Dipak
It's a random number assign by FPGA Marketing people. Depending
on the part family and manufacturer, either smaller OR larger
number means a "faster device".
After a random number has been assigned by marketing, engineering
looks through the device and tries to come up with some sort of
an example where that number is the result of some timing parameter.
After that it is packaged in to documentation to make it look like
a scientifically derived speed grade.
Don't laugh, thats the truth.
Regards,
rudi
=============================================================
Rudolf Usselmann, ASICS World Services, http://www.asics.ws
Your Partner for IP Cores, Design, Verification and Synthesis
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