Dual SD

scatas · ‎2005-05-25

Posted on May 26, 2005 at 05:03

Dual SD

scatas · ‎2005-05-25

Posted on May 25, 2005 at 19:15

I am a new ST72F651 user, in a new design of a box. I need to have temporarily two Secure Digital cards on line to copy data from one card to the other. My question is : is it possible to access the main SD through the SD bus using the DTC coprocessor, whereas accessing the other thorugh the SPI interface using the SS bit as chip select. Of course the two cards shall be used my the microcontroller fw alternatively.

Regards

yu-jun · ‎2005-05-25

Posted on May 26, 2005 at 00:43

Your means is two SD cards are connected using same ports.

You can use ST7265 to connect SD cards using different ports:PC1~3 and PE5~7.

Copy data from one to other using DTC.

alok2 · ‎2005-05-25

Posted on May 26, 2005 at 02:19

Yes, it is possible to run one SD on SDbus and other on SPI. You need to develop your own f/w for using the SPI bus. The f/w available today only uses MMC mode for SD card. SPI mode is slow.

What exactly you are developing ?

scatas · ‎2005-05-25

Posted on May 26, 2005 at 05:03

I cannot tell too many detais because of secret obligation versus my customer. However it should be a portable measurement instrument and the storage is required to store the data before it is uploaded by a PC.