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RE: Looking for a specific application
Yes, we are looking at doing the frame synchronization in software.
The
host will
sort out the bits after they are presented in a big file. The FIFO size is
desired to allow
the host enough turn-around time to set uo the next DMA without worrying
about having
the FIFO overflow. Thanks for the input.
D.J.
----------
From: John R Pierce
To: 'DaveJones'
Subject: RE: Looking for a specific application
Date: Wednesday, July 31, 1996 11:50AM
If your board is going to use DMA, it shouldn't need more than a few bytes
buffering, maybe 64 bytes (16 dwords) would be plenty. If you are going to
have a megabit (i.e. 128kbyte), that will hold 1/2 second, you could easily
use IRQ's and programmed data xfer [the host could read this buffer at
approximately 100Mbyte/sec, so a 1/2 buffer of 64kbytes would only take
a fairly short time to xfer.
I don't know of any such cards, so I can't give you any tips re: this. One
question that comes to my mind is data framing tho... how will the card
know
where bytes/words/whatever start and stop? or is this truly a bitstream,
and the host is going to pick thru it later?
-jrp
----------
From: DaveJones
Sent: Wednesday, July 31, 1996 5:51 AM
To: Mailing List Recipients
Subject: Looking for a specific application
I am looking for a PCI card which will simply take in serial
TTL clock and data, and fill a FIFO or buffer and DMA it to an IBM
host computer. The data rate is 2.2 Mbits/sec. The FIFO or buffer
should be as large as possible, preferably a megabit. We would also
like to find one which has a Solaris or Unix type driver. So far I
have located a card from Hyperspeed Technologies which shows promise
but I would appreciate any additional leads. I have found very little
using web search engines such as Alta Vista. Thank you.
Dave Jones
University of Wisconsin, Madison
Space Science and Engineering Center
davej@ssec.wisc.edu
(608)263-6762
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