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Philips Semiconductors
9.4.5 Get port status
9397 750 08958
Product data
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
0
current connect status
1
port enabled/disabled
2
suspend
3
overcurrent indicator
4
reset
5 to 7
reserved
8
port power
9
low-speed device attached
10 to 15
reserved
Table 21: Get port status response (wPortChange)
Bit #
Function
0
connect status change
1
port enabled/disabled
change
2
suspend change
3
overcurrent indicator change 0
4
reset change
5 to 15
reserved
Rev. 03 — 30 October 2001
Value
Description
0
no device present
1
device present on this port
0
port disabled
1
port enabled
0
port not suspended
1
port suspended
0
no overcurrent condition
1
overcurrent condition detected
0
reset not asserted
1
reset asserted
0
-
0
port powered off
1
port power on
0
full-speed device attached
1
low-speed device attached
0
-
Value
Description
0
no change in current connect status
1
current connect status changed
0
no port error
1
port disabled by a port error
0
no change in suspend status
1
resume complete
no change in overcurrent status
1
overcurrent indicator changed
0
no change in reset status
1
reset complete
0
-
© Koninklijke Philips Electronics N.V. 2001. All rights reserved.
ISP1122A
USB stand-alone hub
19 of 48
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