Functional Description
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PBD — Pointer to Host Buffer Descriptor
PD — Host Packet Descriptor
PPD — Pointer to Host Packet Descriptor
TXSQ — Transmit Queue or Transmit Submit Queue (for USB0 EP1, use Queues 32 or 33, for USB1 EP1
use Queues 62 or 63)
TXCQ — Transmit Completion Queue or Transmit Return Queue (for USB0 Tx EP1, use Queue 93, and
for USB1 Tx EP1 use Queue 125)
RXCQ — Receive Completion Queue or Receive Return Queue (for USB0 Rx EP1, use Queue 109, for
USB1 Rx EP1 use Queue 141)
RXSQ — Receive Free/Buffer Descriptor Queue or Receive Submit Queue. (For USB0 Rx EP1 Queue 0
is used and for USB1 Rx EP1 Queue 16 should be used
16.3.9.9.1 Transmit USB Data Flow Using DMA
The transmit descriptors and queue status configuration prior to the transfer taking place is shown in
Figure 16-18.
1752
Universal Serial Bus (USB) SPRUH73H–October 2011–Revised April 2013
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