On Tue, 19 Jun 2001, Zachariah Mully wrote:
> Hey all-
> I have been trying to figure out if write-protecting CF or PCMCIA flash
> memory when mated to a CF/PCMCIA-to-IDE converter is possible and I have
> found some interesting stuff, but I am not technically proficient enough
> to decode it... So perhaps someone out there on the list could help me
> with this?
> This is from http://copper.he.net/~whiteedc/pdf/ATA10.pdf and it
> describes the function of the "write protect" pin (33) for PCMCIA ATA
> flash:
[...]
> Would anyone else be interested in these flash cards with write-protect
> switches on them?
Yes.
> Or am I barking up the wrong tree here?
*sniff* Interesting bark on this tree, but no, it is not going to work.
The WP/IOIS16# signal is driven by the card to tell the external circuitry
not to attempt to write. There are no hardware signals in this interface
that will support this function. Writes to the controller are necessary
simply to extract data from the flash, so WE# won't work either.
A separate, nonstandard jumper would be needed to disable writes to flash.
>From what you say, they do support this. That is the tree to bark at.
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