參數(shù)資料
型號: ISP1160BD-S
廠商: ST-ERICSSON
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): 13/88頁
文件大?。?/td> 394K
代理商: ISP1160BD-S
Philips Semiconductors
ISP1160
Embedded USB Host Controller
Product data
Rev. 05 — 24 December 2004
20 of 88
9397 750 13963
Koninklijke Philips Electronics N.V. 2004. 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 HCD. The payload data for every transfer in the frame must
have a PTD as the header to describe the characteristic of the transfer. The 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 actual size of the payload data. 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
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