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USB Device Controller
Figure 37.
Non-ISO RX DMA Transaction Example (RX_TC=2)
Host message
System DMA read
DMA_REQUEST
RxTC
180
Universal Serial Bus (USB)
asserted even if RXDMAn.RXn_STOP has been set; in that case, both
RXn_COUNT and RXn_EOT interrupts are asserted (see Figure 37 through
Figure 40).
The transaction count watermark is programmed in the RXDMAn register.
1
2
3
1
2
3
Rx Count IT
2
1
0
4
5
6
4
5
6
Rx Count IT Rx EOT IT
2
1
0
EOT
7
7
2
1
SPRU761A
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