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參數(shù)資料
| 型號： | μPD9210FGC-7EA |
| 廠商： | NEC Corp. |
| 英文描述： | USB Host Controller(USB主控制器) |
| 中文描述： | USB主機(jī)控制器（的USB主控制器） |
| 文件頁數(shù)： | 44/95頁 |
| 文件大?。?/td> | 423K |
| 代理商： | ΜPD9210FGC-7EA |
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CHAPTER 3 DESCRIPTION OF USB HOST CONTROLLER FUNCTIONS
44
After servicing the General TD, the HC updates four General TD fields: ConditionCode, DataToggle, ErrorCount,
and CurrentBufferPointer.
Meanwhile, once Isochronous TD servicing is completed, the HC updates the Offset [R] value to the Packet Status
Word.
If the TD is successfully serviced (all data is sent or received) or if an error has occurred, the HC moves the TD to
the Done Queue and updates the Done Queue Interrupt Counter. Also, the HC updates the ED to change the values
in the HeadP, ToggleCarry, and Halted fields. In order to enqueue the TD into the Done Queue, the HC first copies
the current TD’s NextTD value to the ED’s HeadP field. Next, it writes the HcDoneHead value to the NextTD field of
the TD to be enqueued. Finally, it writes the address of the TD to be enqueued to the HcDoneHead field (see Figure
3-16).
Figure 3-16. Done Queue Operations
ED
HeadP
TD
NextTD
TD
NextTD
HcDoneHead
NextTD
TD
NextTD
TD
NextTD
1
3
2
At this point, the HC uses the TD’s final data toggle value to update the ED’s ToggleCarry field. If the TD is retired
due to an error, the HC also updates the ED’s Halted bit.
After the above series of operations, the HC writes the HcDoneHead value to the HCCA and updates the Done
Queue Interrupt Counter using the Delay Interrupt value (based on number of issued SOF tokens), which defines the
time until an interrupt is generated. However, this counter value is not updated if it is already greater than the Delay
Interrupt value of TD.
The Done Queue Interrupt Counter is decremented after each SOF token, and when the counter value reaches
“0”, the HC writes the current HcDoneHead value to HccaDoneHead immediately at the boundary of the next frame.
After the HcDoneHead value has been written to the HCCA, the HC resets the HcDoneHead value to “0” and sets
“1” to the WritebackDoneHead field in HcInterruptStatus, which triggers an interrupt. In this manner, the Done Queue
is transferred from the HC to the HCD via the HCCA. The HCD services the Done Queue and supplies notification of
completion to the software that requested the transfer.
While WritebackDoneHead is being set, the HC does not write the HcDoneHead value to the HCCA. If another
Done Queue has been set up to be received from the HC, WritebackDoneHead is cleared by the HCD.
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