Kelly,

I have to admit that 64Mb DRAM chips is probably your best bet.
for the ring buffers,
(SRAM would be better if the ring buffers were small)

Then after trigger, dump data straight to a PCCard flash disk,
(or Compact Flash if 96MB were enough / you could use compression)

Then when complete logging, dump the ring buffer to flash disk,


http://www.sandisk.com/oem/compact_specs.htm

(they're spec'ed to 2000G - thou you need to lock it into the connector!!)

sadly this would mean you have to bite the bullet on:-
1)  DRAM refresh (although a ring buffer would by definition be just
an address increment which it is easy to generate refreshes)
2)  Bad sectors on the flash disk,
(store a note of the bad sectors in RAM on power on.)
3)  DRAM power consumption, although at 200K/sec, this will be
low (<10mA) if you use the low power, slow refresh versions.

any more help, just shout!

Steve Lawther




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