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ISP1160

Embedded Universal Serial Bus Host Controller

Philips Electronics 

Philips Semiconductors

ISP1160

Embedded USB Host Controller

The PTD data structure is used by the HC to define 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 definition

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:

Bit

Byte 0

Byte 1

Byte 2

Byte 3

Byte 4

Byte 5

Byte 6

Byte 7

Philips Transfer Descriptor (PTD): bit allocation

7

6

5

4

3

2

ActualBytes[7:0]

CompletionCode[3:0]

Active

Toggle

MaxPacketSize[7:0]

EndpointNumber[3:0]

Last

Speed

TotalBytes[7:0]

reserved

B5_5

reserved

DirectionPID[1:0]

Format

FunctionAddress[6:0]

reserved

1

0

ActualBytes[9:8]

MaxPacketSize[9:8]

TotalBytes[9:8]

9397 750 11371

Product data

Rev. 04 — 04 July 2003

© Koninklijke Philips Electronics N.V. 2003. All rights reserved.

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