PCI卡识别

wdy7564 · 发表于 2004-7-9 10:35:34

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PC机中如何识别PCI槽中是否有卡？看到两种说法，不知哪种正确？
1：通过PCI总线的PRSNT1，PRSNT2的设置。
2：通过PCI总线的遍历读合法的设备码

sunyzs · 发表于 2004-7-9 16:05:26

These are PRSNT1# and PRSNT2#. They are
used for two purposes: indicating that an add-in card is physically present in the slot and
providing information about the total power requirements of the add-in card.
PRSNT1# PRSNT2# Add-in Card Configuration
Open Open No add-in card present
Ground Open Add-in card present, 25 W maximum
Open Ground Add-in card present, 15 W maximum
Ground Ground Add-in card present, 7.5 W maximum