[Gllug] re: SCSI vs SATA

[Chris Bell]

On Thu 10 Jun, Richard Jones wrote:
> 

> Yes, I used to do this sort of stuff.  Once you start hitting 100s of
> MHz or GHz speed, all the traces need to be the same length, each
> signal needs a separate return path, you need a huge ground plane, and
> you need to add resistors to the end of each signal to stop
> reflections.  The resistors were a particular problem I seem to
> remember - we actually had to build the boards, and measure the
> signals with an oscilloscope to find the right size of resistor.  This
> was nearly 10 years ago, I don't know if things have improved since.
> 

   And even the oscilloscope probe affects the answer, then we start
connecting any plug-in cards we think we need, dangle cables everywhere,
heat it up, cool it down, tip cola over it then blow dust at it, and get
upset if it fails within the warranty period.

-- 
Chris Bell

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