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Philips Semiconductors
ISP1122
USB stand-alone hub
Product specification Rev. 03 — 29 March 2000 19 of 48
9397 750 07002
© Philips Electronics N.V. 2000. All rights reserved.
9.4.5 Get port status
The hub returns 4 bytes. The first 2 bytes contain the port status bits (wPortStatus,
see Table 20). The last 2 bytes hold the port status change bits (wPortChange, see
Table 21).
Table 20: Get port status response (wPortStatus)
Bit # Function Value Description
0 current connect status 0 no device present
1 device present on this port
1 port enabled/disabled 0 port disabled
1 port enabled
2 suspend 0 port not suspended
1 port suspended
3 overcurrent indicator 0 no overcurrent condition
1 overcurrent condition detected
4 reset 0 reset not asserted
1 reset asserted
5 to 7 reserved 0 -
8 port power 0 port powered off
1 port power on
9 low-speed device attached 0 full-speed device attached
1 low-speed device attached
10 to 15 reserved 0 -
Table 21: Get port status response (wPortChange)
Bit # Function Value Description
0 connect status change 0 no change in current connect status
1 current connect status changed
1 port enabled/disabled
change
0 no port error
1 port disabled by a port error
2 suspend change 0 no change in suspend status
1 resume complete
3 overcurrent indicator change 0 no change in overcurrent status
1 overcurrent indicator changed
4 reset change 0 no change in reset status
1 reset complete
5 to 15 reserved 0 -