Philips ISP1122 ユーザーズマニュアル
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
see
). The last 2 bytes hold the port status change bits (wPortChange, see
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
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
-