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DAC37J82: SYNC request only with > 1 octet

Part Number: DAC37J82

Upon configuring DAC37J82 (LMF = 421), the device doesn't issue a SYNC request to the JESD204B host.

If we change register 0x4B from 0x00 to 0x01 (2 octets per frame), the DAC37J82 initiates a SYNC request,

This is obviously unexpected. Any clues?

Mike