Do I need to pull high DO, DI and CLK,CS line for the mmc?

[tango_ang]

Pull high mmc dataline

hi,do anyone know do i need to pull high my DO and DI and so do the CLK and CS line for the mmc? i want to operate in SPI mode and my Vdd is 3.3V.
I do before pull high the DO,DI and CS line( external pull high) but i realize that the DO line is always high. seems like the MMC din give me any response.
thanks everybody!!! 8)

 

[checkmate]

Re: Pull high mmc dataline

I remembered some of the lines were open-drain, if you used the SPI-mode. It's in the datasheets. Check that out.

This was the circuit I used before. Works 99% of the time, with the occassional error response. Target system was a PIC. I'm not too sure if the response was due to timing constraints or due to the circuits.

Note that I used a 5V supply, which was dropped to 3.2V by the LED. 7407 was used for voltage conversion, so may not apply to you also. So you could drop the LED and probably a few other components.

Cheers!