SPRZ536B September 2022 – July 2024 AM69 , AM69A , TDA4AH-Q1 , TDA4AP-Q1 , TDA4APE-Q1 , TDA4VH-Q1 , TDA4VP-Q1 , TDA4VPE-Q1
DRU: TR Submission can be corrupted by C7x writes coming out of order if Non-Atomic TR Submission Mechanism is Used
The C7x can allow writes to come out of order from how they are sent by the CPU. The Non-Atomic TR register in the DRU requires that the lowest byte of the TR is written last as that forces the other fields to be pushed into the TR queue. The out of order write will cause the wrong TR fields to be used if the last write does not come last causing for unexpected behavior from the DRU.
The C7x should only use the Atomic TR submission method as this only requires a single 64 byte write for the TR submission.