Nec Network Controller uPD98502 Bedienungsanleitung Seite 354

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Seitenansicht 353
CHAPTER 6 USB CONTROLLER
354
Preliminary User’s Manual S15543EJ1V0UM
6.6.6.2 Assemble mode
The following figure illustrates the receive operations performed by USB Controller in Assemble Mode.
Figure 6-22. USB Controller Receive Operations (Assemble 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
Last data ?
(9)
Yes
No
(5)
(6)
(7)
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