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Old 05-06-2006, 12:18 PM
Thomas Womack
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Default Re: Opteron HT coprocessors

In article <[email protected]>,
<[email protected]> wrote:
>>things now bringing high end commodity CPUs (as opposed to specialist DSP
>>hardware) and FPGAs close together - offerings from Cray, SGI, this new
>>opteron socketed thingie etc. Most of the fuss is around their use in
>>reconfigurable computing so the offerings tend to be lacking for raw
>>serial IO...

>
>>: Whats you acquisition area?

>
>>Starlight - astronomical adaptive optics. Potentially you can be talking
>>about multiple CCDs of many thosands of pixels framing at over 1KHz...

>
>CCD -> Hyperthread -> FPGA -> Hyperthread .. other cpu(s).


I'm not sure that a hypertransport-attached CCD is very practical: HT
is a short-range interconnect, and I suspect it's fast enough that
you'd have great difficulty implementing it in the rather peculiar fab
processes required to make a CCD.

I can't find a datasheet for a modern CCD, but the obsolete TC237
has only twelve pins, requires rather complicated digital waveforms
on five of them, and outputs analogue pixel data on two more; you
want to keep the ADC as close to the detector as possible, I'd have
thought connecting the ADCs via an FPGA to gigabit-ethernet channels
would be a reasonable way to go, leaving the problem of data
acquisition from lots of gigabit ethernet connectors as one already
solved by the WAN people.

Tom
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