Chapter 9 Hot Plug Support
9.1
Hot Plug Purpose and Capability
Note: The PEX 8532’s Hot Plug Controllers are compliant with the PCI Hot Plug r1.1
and PCI Standard Hot Plug Controller and Subsystem r1.0.
Hot Plug capability allows board insertion and extraction from a running system, without adversely
affecting the system. Boards are typically inserted or extracted to repair faulty boards or re-configure the
system without system down time. Hot Plug capability allows systems to isolate faulty boards in the
event of a failure. The PEX 8532 includes one Hot Plug Controller per downstream port.
9.1.1
Hot Plug Controller Capabilities
• Insertion and removal of PCI Express boards, without removing system power
• Board-present and MRL (Manually operated Retention Latch) Sensor signals supported
• Power Indicator and Attention Indicator Output signals controlled
• Attention Button monitored
• Power fault detection and Faulty board isolation
• Power switch for controlling downstream device power
• Generates PME (Power Management Event) for Hot Plug events in sleeping systems (D3hot)
• Presence detect is accomplished through an in-band SerDes receiver detect mechanism
or by using the HP_PRSNTx# signal
• Hot Plug interrupts can be sent in-band using INTx or MSI messages
ExpressLane PEX 8532AA/BA/BB/BC 8-Port/32-Lane Versatile PCI Express Switch Data Book
Copyright © 2007 by PLX Technology, Inc. All Rights Reserved – Version 1.6
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