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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)： | 38/95頁 |
| 文件大?。?/td> | 423K |
| 代理商： | ΜPD9210FGC-7EA |
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CHAPTER 3 DESCRIPTION OF USB HOST CONTROLLER FUNCTIONS
38
3.4.4 Isochronous transfer descriptor field definitions
Table 3-3. Description of Isochronous TD
Name
HC Access
Description
SF
R
Starting Frame
This includes the low-order 16 bits of the number of frames sent by the Isochronous TD’s first
data packet.
DI
R
Delay Interrupt
This indicates the time until a interrupt occurs following completion of Isochronous TD servicing.
FC
R
Frame Count
This is the number of data packets indicated by the Isochronous TD. When Frame Count = 0,
one data packet is included and when Frame Count = 7, eight data packets are included.
CC
R/W
Condition Code
This field includes a completion code when an Isochronous TD has been transferred to the Done
Queue.
BP0
R
Buffer Page 0
This is the physical page number of the first byte in the data buffer used by the Isochronous TD.
NextTD
R/W
Next TD
This indicates the next Isochronous TD in the Isochronous TD queue linked to an ED.
BE
R
Buffer End
This includes the physical address of the buffer’s last byte.
OffsetN
R
Offset
This is used to determine the size and start address of an isochronous data packet.
PSWN
W
Packet Status Word
This includes the size of the completion code and the received isochronous data packet.
Isochronous TDs have a (Frame Count + 1) frame buffer with a continuous range from 1 to 8. The first data
packet is sent when the low-order 16 bits of HcFmNumber matches the Isochronous TD’s Starting Frame value. If
the buffer address exceeds the 4-K boundary during a data packet transfer, the high-order 20 bits of the Buffer End
field is used as the physical address of the next page. Consequently, the next buffer address becomes byte 0 in the
same 4-K page space that is used when the final byte is retained.
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