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Old 05-07-2006, 06:25 AM
JJ
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Default Re: Opteron HT coprocessors


Thomas Womack wrote:
> 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


One fast image sensor project I bumped into that was not an end user
camera, was based on a cmos sensor, not that I have ever been impressed
with cmos web or picture cameras. In that design I was told of a 4k x
4k sensor with 1KHz or so frame rates with multi stacking of cm size
chips, the processing logic was in pixel blocks in a second layer. If
the A/D conversion could have been done in pixel tiles parallel style,
I am sure one could have put HT on it too (for bottomless $ budget). HT
only makes sense in an interactive compute situation, not a
input/output only one.

The serial data rate would have been quite fast but as you say, better
to use standard gig networking that you can use plug n play to any
workstation.

John Jakson

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