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ISP1122ABD 数据表(PDF) 19 Page - NXP Semiconductors |
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ISP1122ABD 数据表(HTML) 19 Page - NXP Semiconductors |
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19 / 48 page ![]() Philips Semiconductors ISP1122A USB stand-alone hub Preliminary specification Rev. 01 — 27 March 2000 19 of 48 9397 750 06986 © 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 - |
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