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ISP1130

Universal Serial Bus compound hub with integrated keyboard controller

Philips Electronics 

Philips Semiconductors

ISP1130

USB compound hub with keyboard controller

Table 3: Endpoint allocation…continued

Function Ports

Endpoint Transfer

identifier type

Embedded 5 (or 4 [5]) 0

Function 3

control

1

generic [3]

Endpoint

index

8

9

10

11

Direction [1] Max. packet

size (bytes)

OUT

8

IN

8

OUT

8

IN

8

[1] IN: input for the USB host; OUT: output from the USB host.

[2] Hub endpoints are not indexed.

[3] Generic endpoint can be used as bulk or interrupt endpoint.

[4] Port 2 can be disabled by connecting both D+ and D− to VCC.

[5] The port number is reduced by 1 when downstream port 2 is disabled.

7.2 Hub endpoint 0 (control)

All USB devices and functions must implement a default control endpoint (ID = 0).

This endpoint is used by the host to configure the device and to perform generic USB

status and control access.

The ISP1130 hub supports the following USB descriptor information through its

control endpoint 0, which can handle transfers of 64 bytes maximum:

• Device descriptor

• Configuration descriptor

• Interface descriptor

• Endpoint descriptor

• Hub descriptor

• String descriptor.

7.3 Hub endpoint 1 (interrupt)

Endpoint 1 is used by the ISP1130 hub to provide port status change information to

the host. This endpoint can be accessed only after the hub has been configured by

the host (by sending the Set Configuration command).

Endpoint 1 is an interrupt endpoint: the host polls it once every 255 ms by sending an

IN token. If the hub has detected no change in the port status it returns a NAK (Not

AcKnowledge) response to this request, otherwise it sends the Status Change byte

(see Table 4).

Table 4: Status Change byte: bit allocation

Bit Symbol

Description

0

Hub SC

a logic 1 indicates a status change on the hub’s upstream port

1

Port 1 SC a logic 1 indicates a status change on downstream port 1

2

Port 2 SC a logic 1 indicates a status change on downstream port 2 or on

embedded function 1 (downstream port 2 disabled)

3

Port 3 SC a logic 1 indicates a status change on embedded function 1 or on

embedded function 2 (downstream port 2 disabled)

9397 750 06895

Objective specification

Rev. 01 — 23 March 2000

© Philips Electronics N.V. 2000. All rights reserved.

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