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OMAP L138 UPP data width

Hello,

1). Does anybody know how to connect the data bus of an external ADC device to the UPP port if the data width is 12-bit? Should the 12-bit data bus connect to the 12 MSBs of UPP data or the 12 LSBs of the UPP data bus?

2). Can I connect the 12-bit ADC data to the UPP 12MSBs, i.e. D[15:4] if I set the UPP data interface to 16-bit interface (IWA=1), and the data width=12-bit (DPWA=4h)? 

If the answer is YES, can I use the pin UPP_D[0] as an GPIO? 

 

Thanks,

Wenbo