Nec Network Controller uPD98502 Manual de usuario Pagina 356

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CHAPTER 6 USB CONTROLLER
356
Preliminary User’s Manual S15543EJ1V0UM
6.6.6.3 Separate mode
The following figure illustrates the receive operations performed by USB Controller in Separate Mode.
Figure 6-23. USB Controller Receive Operation Sequence (Separate Mode)
Stores the data from USB to
receive FIFO
Receives data
from USB
- CRC verify
- Bit Stuffing verify
- NRZI decode
Buffer is remaining
in system memory
area ?
Yes
No
DMA transfers to
system memory
Writes Rx indication
Updates write pointer,
Sets Rx completion bit of
corresponding EndPoint in
UGSR register
(1)
(2)
(4)
(8)
(10)
(11)
(3)
Waits data
Fetches new
buffer descriptor
Encounters link pointer ?
Updates Pool Information
Registers
No
Yes
Data Size < MaxP ?
(9)
No
(5)
(6)
(7)
Buffer becomes full ?
(12)
Yes
Yes
No
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