I am trying to bit bang SPI for a SD Card, I went through this SD Card datasheet and I couldn't find any information regarding the mode that needs to be used. If I missed, please point it out.
Else what mode would be standard if nothing is mentioned? What CPOL and phase should I use?
Answer
From the datasheet you link to 
The timing diagram at 3.4.5 shows that the clock idles low (CPOL=0), and that out changes on the clock trailing edge and in gets read on the rising edge (CPHA=0), which is SPI mode 0.
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