TMS320C6748: Using McASP to drive a parallel ADC

It could be possible to use this serial interface as a parallel interface, but it depends on the signaling format of the ADCs. How do you propose to hook up the bit clock and word strobe/clock? Can you share the ADC part numbers?

There are 16 data lines on the McASP peripheral - typically they represent 16 audio channels. Each channel would be processed in software separately. But I can imagine clever software could fill each channel with a bit stream that contains parallel data. I don't think we have an example of this. Both 8-bit interfaces would need to use the same clock during transmit, but the lower 8-bits or upper 8-bits can be disabled while the other is in use.

See TRM Section 23.0.21.1 Serializers (SPRUH79)
The serializers take care of shifting serial data in and out of the McASP. Each serializer consists of a shift
register (XRSR), a data buffer (XRBUF), a control register (SRCTL), and logic to support the data
alignment options of the McASP. For each serializer, there is a dedicated serial data pin (AXR[n]) and a
dedicated control register (SRCTL[n]). The control register allows the serializer to be configured as a
transmitter, receiver, or as inactive. When configured as a transmitter the serializer shifts out data to the
serial data pin AXR[n]. When configured as a receiver, the serializer shifts in data from the AXR[n] pin.
The serializer is clocked from the transmit/receive section clock (ACLKX/ACLKR) if configured to
transmit/receive respectively.
All serializers that are configured to transmit operate in lock-step.

Refer to this thread:
e2e.ti.com/.../371911

You might require a multi-channel SPI port instead of McASP.

Regards,
Mark