Philips Universal Serial Bus ISP1122 - Manual (Page 18)

Philips Semiconductors
ISP1122
USB stand-alone hub
Product specification Rev. 03 — 29 March 2000 18 of 48
9397 750 07002 © Philips Electronics N.V. 2000. All rights reserved.
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 .
9.4.2 Get configuration
The hub returns 1 byte, see Table 17 .
9.4.3 Get interface status
The hub returns 2 bytes, see Table 18 .
9.4.4 Get hub status
The hub returns 4 bytes, see Table 19 .
Table 16: Get device status response
Bit # Function Value Description
0 self-powered 0 bus-powered
1 self-powered
1 remote wake-up 0 no remote wake-up
1 remote wake-up enabled
2 to 15 reserved 0 -
Table 17: Get configuration response
Bit # Function Value Description
0 configuration value 0 device not configured
1 device configured
1 to 7 reserved 0 -
Table 18: Get interface status response
Bit # Function Value Description
0 to 15 reserved 0 -
Table 19: Get hub status response
Bit # Function Value Description
0 local power source 0 local power supply good
1 local power supply lost
1 overcurrent indicator 0 no overcurrent condition
1 hub overcurrent condition detected
2 to 15 reserved 0 -
16 local power status change 0 no change in local power status
1 local power status changed
17 overcurrent indicator change 0 no change in overcurrent condition
1 overcurrent condition changed
18 to 31 reserved 0 -