PCMCIA CF signal monitoring - How to

Feb 06, 2007 3 Replies
R

Hi everyone. I'm a new member with a lot of basic questions.



The project I'm working on now is to monitor the PCMCIA signal being sen to a CF card for storage. Every time an action is taken on this embedde system, a small output file is written to the card. How can I monitor this signal as it's happening? Of course I can just remove the card and transfer the file, but that won' work for this situation. Also, I can't change the drivers on the embedde side.



Any ideas?



Thanks for all the help.



-Dave


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L

Subverting a voting machine, are we?

You need to snoop the interface and essentially run an emulator operating on a RAM image.

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R

sent

embedded

Is there a system out there that can already do this? I'm not messin with a voting machine (good try) but I just want to have a copy of th file without removing the card. what are the steps to "snooping" this interface? Thanks

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L

First step is to figure out the access mode of the embedded system, and the number of pins to monitor.

  1. 16 bits memory mode - 16 data, 10 addr and 6 control.
  2. 8 bits memory mode - 8 data, 10 addr and 6 control.
  3. 16 bits IDE mode - 16 data, 3 addr and 6 control.
  4. 8 bits IDE mode - 8 data, 3 addr and 6 control.

If you are not sure, go for 1 with 32 pins. You probably have to sample the signals at 1MHz. You have to buffer at least 512 bytes + overheads.

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