Nec Network Controller uPD98502 Bedienungsanleitung Seite 349

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Seitenansicht 348
CHAPTER 6 USB CONTROLLER
Preliminary User’s Manual S15543EJ1V0UM
349
(1) Reception in EndPoint0, EndPoint6
Same processing is executed without relations in receive mode in EndPoint0, EndPoint6 every time.
Figure 6-16. Data Receiving in EndPoint0, EndPoint6
D0
µ
PD98502
Buffer
Directory
D1D2D3
D0
D1
D2
Rx Indication
Rx Indication
Rx Indication
D0
D3
Rx Indication
When USB Controller receives one USB packet, stores it in Data Buffer and write Rx indication to the Mailbox. USB
Controller updates the size field and Last field in Buffer Descriptor every USB packet before writing Rx Indication.
(2) EndPoint2, EndPoint4, normal mode
The processing in EndPoint2, EndPoint4 receive Normal mode is explained below.
Figure 6-17. EndPoint2, EndPoint4 Receive Normal Mode
D0
µ
PD98502
Buffer
Directory
D1D2D3
D0
D1
D2
Rx Indication
Rx Indication
Rx Indication
D0
D3
Rx Indication
When USB Controller receives one USB packet, stores it in Data Buffer and write Rx indication to the Mailbox. USB
Controller updates the size field and Last field in Buffer Descriptor every USB packet before writing Rx Indication.
Seitenansicht 348
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