On Thu, 2011-09-29 at 14:28 -0400, V G wrote:
> Wow, I can't believe I missed this -
>=20
> 1. Computer SDRAM, or

VERY hard to interface to due to the speeds required. Note: most DRAM
will NOT run at slow speeds (modern DRAM is usually speced to not run at
less then hundreds of MHz).

> 2. SPI SD cards, or compact flash.

SPI mode on SD cards is likely nowhere near fast enough for your
purposes.

CF in IDE mode is, but it's doubtful you'd be able to get enough
bandwidth using a PIC and bit banging, you'd need a CPLD or FPGA (I've
done it).

Note that both methods have variable write times that you'll have to
account for. SD cards are known to write at steady rates for a good bit
and then "hiccup" for a substantial amount of time, you'll have to
account for that.

TTYL


--=20
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