ISP1122A Просмотр технического описания (PDF) - Philips Electronics

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ISP1122A

Universal Serial Bus stand-alone hub

Philips Electronics 

Philips Semiconductors

ISP1122A

USB stand-alone hub

9.4 Hub responses

This section describes the hub responses to requests from the USB host.

9.4.1 Get device status

The hub returns 2 bytes, see Table 16.

Table 16: Get device status response

Bit #

Function

Value

0

self-powered

0

1

1

remote wake-up

0

1

2 to 15 reserved

0

Description

bus-powered

self-powered

no remote wake-up

remote wake-up enabled

-

9.4.2 Get configuration

The hub returns 1 byte, see Table 17.

Table 17: Get configuration response

Bit #

Function

Value

0

configuration value

0

1

1 to 7 reserved

0

Description

device not configured

device configured

-

9.4.3 Get interface status

The hub returns 2 bytes, see Table 18.

Table 18: Get interface status response

Bit #

Function

Value

0 to 15 reserved

0

Description

-

9.4.4 Get hub status

The hub returns 4 bytes, see Table 19.

Table 19: Get hub status response

Bit #

Function

Value

0

local power source

0

1

1

overcurrent indicator

0

1

2 to 15 reserved

0

16

local power status change 0

1

17

overcurrent indicator change 0

1

18 to 31 reserved

0

Description

local power supply good

local power supply lost

no overcurrent condition

hub overcurrent condition detected

-

no change in local power status

local power status changed

no change in overcurrent condition

overcurrent condition changed

-

9397 750 06986

Preliminary specification

Rev. 01 — 27 March 2000

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

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