CF+ modes confusion

Mar 11, 2007 2 Replies
H

I have been trying to interface a compact flash card to a host system usin a CPLD. I have a confusion regarding the possible modes of 3 operation o these cards. By design standards , I would like to know that whether w have host systems CF interfaces (say a PC CF interface) which can rea different types of CF card modes, be it memory, I/O of True IDE. O whether a compact flash card is capable of being read in any mode, and it the host interface which has the limitation of a particular mode.



Suppose , a CF+ card is inserted in the host CF interface, how does th Host know whether its an CF memory card or a CF card with an IO devic (like wifi). In short, how does host determine which mode to choose ??



Kindly help me to proceed,



Harshit


Vote
Twitter Facebook LinkedIn
L

Most storage cards implement both memory mode and IDE mode. I/O cards implement both memory mode and I/O mode.

Wifi cards handle I/Os as well as the 1K memory buffer. Namely, you have to hook up all the signals.

Read the attribute block and registers, or the IDE enable pin.

Vote
Twitter Facebook LinkedIn
L

It depends on the host interface. If the host ONLY supports storage devices, it may implement the port in True-IDE mode, which can't support I/O cards.

Otherwise, see the PCMCIA spec.

Vote
Twitter Facebook LinkedIn

Join the Discussion

Have something to add? Share your thoughts — no account required.

Didn't find your answer?

Ask the community — no account required