[SI-LIST] Re: SEU errors

Tom, Xilinx offers the following methods:

a) Periodic reload entire device, or column by column
b) Absolute bit image compare, device or col by col.
c) CRC digest device or col by col.

The col by col methods are attractive for reducing the MTTR, but still lend 
themselves to red/black by device.  The CRC digest is good for data 
reduction.  Absolute images require full size map and mask images, and so 
eat a lot of memory.  In NAND flash that might not be a problem.  But then 
the NAND flash needs SEU protection as well.

Regards,


Steve

At 09:02 AM 4/13/2005 -0700, Tom Biggs wrote:
>I have heard of a satellite that had a non-rad hard FPGA in it. They
>needed the density of a commercial part and they could handle short term
>failures. So they just reloaded the FPGA every so often to clear out any
>bits that got flipped by single event upsets (SEUs).
>
>      -tom
>
>-----Original Message-----
>From: si-list-bounce@xxxxxxxxxxxxx [mailto:si-list-bounce@xxxxxxxxxxxxx]
>On Behalf Of Scott McMorrow
>Sent: Wednesday, April 13, 2005 8:23 AM
>To: cshroff@xxxxxxxxx
>Cc: ray.anderson@xxxxxxxxxx; Bradley.S.Henson@xxxxxxxxxx;
>si-list@xxxxxxxxxxxxx
>Subject: [SI-LIST] SEU errors
>
>
>Chirag,
>
>The current research indicates that SEU errors are possible for=20
>SRAM-based FPGA's.  Whether they occur in near sea-level applications to
>
>any high probability is up for grabs.  But it is such a concern in=20
>aircraft applications that mil-aero contractors are designing circuits=20
>with redundant FPGAs for airborne applications.
>
>
>Regards,
>
>scott
>
>
>
>Scott McMorrow
>Teraspeed Consulting Group LLC
>121 North River Drive
>Narragansett, RI 02882
>(401) 284-1827 Business
>(401) 284-1840 Fax
>
>http://www.teraspeed.com
>
>Teraspeed(r) is the registered service mark of
>Teraspeed Consulting Group LLC
>
>
>
>Chirag Shroff (cshroff) wrote:
>
> >=3D20
> >-----BEGIN PGP SIGNED MESSAGE-----
> >Hash: SHA1
> >
> > Our SEU research group has several test sites co-located at a number=20
> >of high-altitude astronomical observatory mountain top  locations.
> >
> >So do you see Soft error events on these test sites ?
> >
> >- --Chirag Shroff
> >
> > =3D20
> >
> >-----BEGIN PGP SIGNATURE-----
> >Version: PGP 8.1
> >
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