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Recent content by mnipsy

  1. M

    4 bit SD mode interface to FPGA

    You're right. I'm new to logic design... But where's this output enable signal? Is it just the CMD line in the SD card? Sorry for asking you too much and thank you! - - - Updated - - - It's quite useful. Right now, I just try to find where the test_o_en is for the SD card.
  2. M

    4 bit SD mode interface to FPGA

    I think bidirectional bus operation is a problem because I was thinking I can only assign a line to be either input or output in FPGA's GPIO. If it's bidirectional, I would have difficulty to tell part when it works as an input line and when it works as an output line. Thanks for sharing the...
  3. M

    4 bit SD mode interface to FPGA

    Hi there, Can FPGA read and write SD card in 4 bit SD mode? The DAT[0:3] lines are bi-directional in this case. It seems hard to deal with it. Any ideas or should I purchase some written SD mode driver (where can I find it?)? Many thanks!
  4. M

    SD card, SD sniffers connected to FPGA

    New problem occurs. DAT0 and CMD are bidirectional. Then how about the clock line and CS line? Can I just buffer these two lines through FPGA? I tried to just buffer clock and CS line; it turned out that the computer could detect SD card, but it always ask to format the SD card. I'm wondering...
  5. M

    SD card, SD sniffers connected to FPGA

    So how can I let my computer choose SPI mode so I can buffer DAT0 and CMD line?
  6. M

    SD card, SD sniffers connected to FPGA

    Thanks! - I'll try to connect Vcc and GND directly between two SD sniffiers. - How can I tell which mode my computer uses? Ingnoring the FPGA, I once connected two SD sniffers together directly, i.e, computer<----SD sniffier(no sd card)<-----SD sniffer ( with SD card). And I found that only 5...
  7. M

    SD card, SD sniffers connected to FPGA

    Hi Everyone, I have one SD card, two SD Sniffers and an Actel Dev board. (Click for their products information) What I wanna do is like this: insert one SD sniffer without a SD card into my computer, connect it to the FPGA board as input, then connect another SD sniffer with SD card to the...
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