Confusion regarding MMC pins and MMC driver...

[arunb]

Hi,

I am using the MMC driver in the CCS folder to read and write to a MMC card.

However I need help in identifying the pins.

According to the MMC specification version 3.1 the 7 pins of the card are named as

Pin 1 RSV NC
Pin 2 CMD I/O/PP/OD Command/Response
Pin 3 VSS1 S Supply voltage ground
Pin 4 VDD S Supply voltage
Pin 5 CLK I Clock
Pin 6 VSS2 S Supply voltage ground
Pin 7 DAT

In the MMC driver code the pins are named as

#define MMC_CLK PIN_B1
#define MMC_DI PIN_B0
#define MMC_DO PIN_B3
#define MMC_CS PIN_B2

The supply, ground and the clock pins are clear enough, but where should the pins CMD and DAT be connected....???

thanks
arunb

[PCM programmer]

Download the Sandisk MMC manual:
http://www.sandisk.com/Assets/File/OEM/Manuals/manual-rs-mmcv1.0.pdf
Look at Table 5-1 on page 69 in the Acrobat reader.
It shows the signal names for MMC mode and for SPI mode.
Now you can clearly see how to connect the pins.