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參數(shù)資料
| 型號： | 935270538118 |
| 廠商： | NXP SEMICONDUCTORS |
| 元件分類： | 總線控制器 |
| 英文描述： | UNIVERSAL SERIAL BUS CONTROLLER, PQFP64 |
| 封裝： | 10 X 10 MM, 1.40 MM HEIGHT, PLASTIC, MS-026, SOT-314-2, LQFP-64 |
| 文件頁數(shù)： | 13/93頁 |
| 文件大?。?/td> | 2118K |
| 代理商： | 935270538118 |
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Philips Semiconductors
ISP1160
Embedded USB Host Controller
Product data
Rev. 03 — 27 February 2003
20 of 89
9397 750 10765
Koninklijke Philips Electronics N.V. 2003. All rights reserved.
The PTD data structure is used by the HC to dene a buffer of data that will be moved
to or from an endpoint in the USB device. This data buffer is set up for the current
frame (1 ms frame) by the rmware, the HCD. The payload data for every transfer in
the frame must have a PTD as the header to describe the characteristic of the
transfer. PTD data is DWORD (double-word or 4-byte) aligned.
9.3.1
PTD data header denition
The PTD forms the header of the PTD data. It tells the HC the transfer type, where
the payload data should go, and the payload data’s actual size. A PTD is an 8-byte
data structure that is very important for HCD programming.
Table 4:
Philips Transfer Descriptor (PTD): bit allocation
Bit
7
6
5
4
3
2
1
0
Byte 0
ActualBytes[7:0]
Byte 1
CompletionCode[3:0]
Active
Toggle
ActualBytes[9:8]
Byte 2
MaxPacketSize[7:0]
Byte 3
EndpointNumber[3:0]
Last
Speed
MaxPacketSize[9:8]
Byte 4
TotalBytes[7:0]
Byte 5
reserved
B5_5
reserved
DirectionPID[1:0]
TotalBytes[9:8]
Byte 6
Format
FunctionAddress[6:0]
Byte 7
reserved
Table 5:
Philips Transfer Descriptor (PTD): bit description
Symbol
Access
Description
ActualBytes[9:0]
R/W
Contains the number of bytes that were transferred for this PTD.
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