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Question about the McASP

Hi TI's experts 

We are working on DaVinci Processor DM8148 McASP now . 

there is a input data timing like this :

the slot is 32bit , left and right channel just like IIS timing . 

but there is only 16bit real data like below :

NNNN-NNNN-DDDD-DDDD-DDDD-DDDD-NNNN-NNNN

we can not change the slot size which is 32bit width , so can we use the XFMT register to modify the McASP receive this type timing ? 

Slot size is 32bit 

Data size is 16bit 

but how to set the register to ignore the first 8 bit data ? and capture the 16bit real data to the linux user space ?