I need to configure SDHC controller #2 as a standard 4 bit SD slot interface. We have SDHC slot #1 configured as our external SD slot and it is working fine with standard SD cards.
We want to use SDCH #2 as an interface to a SanDisk iNAND chip which intefaces like a standard SD card (4 data lines,clock plus cmd line). I can not get the configuration correct and can not read from the part. It looks like SDHC #2 defaults to a "external transceiver" mode which uses extra pins for direction control etc. unlike SDHC #1. The TRM seems to indicate I can do what I am attempting (just using the CLK, D0-4 and CMD from SDHC#2) is valid but its not to clear on just what needs to be configured.
I know another difference between SDHC #1 and SDHC #2 and #3 is the bias for 3V to support 3v cards. SDHC #2 and #3 only supports 1.8v which is what the iNAND part uses so I assume there is no bias configuration needed.
Can someone provide some insite?
