On Friday, May 06, 2005 1:33 PM, Kiran Thota wrote: > Another question: If I rework the board so that the wires coming to > MEMR and MEMW are rewired to IOR and IOW respectively, does it work > in TrueIDE mode? Just a thought! No. TrueIDE mode changes the meaning of many input/output pins, and thus is significantly different from PCcard IO mode so that this will not work. Also, you should bear in mind that (P)IO mode is more similar to IDE mode than it is to memory mode. To operate the CF/CF+ card in memory mapped mode you will need the following signals: A[0:10] D[0:15] -CD1, -CD2 -CE1, -CE2 -OE RDY_BUSY -REG RESET -WE WP Refer to the "CF+ & CF SPECIFICATION REV. 3.0", pg. 24-30 for details. http://www.compactflash.org/cfspc3_0.pdf If your cards are not going to be removable, you can get away with tying up/dn some lines. Also, please note that on pg. 89, the specification allows for alternate ways that a CF card may 'enter' either trueIDE or memory/io mode. Please be aware of this, because certain software implementations may inadvertently cause -OE to stay asserted for an extended period of time, thus causing the card to spontaneously switch modes. This results in the card seemingly becoming opaque until the next reset or power cycle. Best Regards, -bogdan
