SPRUJB3 March 2024 AM67 , AM67A , TDA4AEN-Q1 , TDA4VEN-Q1
Tx channels also use packet queues referred to as “transmit completion queues” to return packets to the host after they are transmitted. A Tx Completion Queue is provided for each Tx Queue. The DMA controllers do not actually write anything back to completion queues (except for a teardown acknowledgement) but instead just increment the reverse occupancy. Transmit completion queues are implemented as the reverse queue on the shared ring structure for a Tx flow.