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IDT Hot-Plug and Hot-Swap
Notes
PES48H12G2 User Manual
Associated with all PES48H12G2 ports is a hot-plug controller. However, hot-plug is only supported
when a port is configured to operate in downstream switch port mode. Hot-plug is supported within switch
partitions. When hot-plug is enabled in a downstream port of a switch partition, the behavior is identical do
that expected if the switch partition were a stand-alone PCIe switch. In a port configured to operate in down-
stream switch port mode, the hot-plug controller may be enabled by setting the HPC bit in the PCI Express
Slot Capabilities (PCIESCAP) register associated with that port.
– The HPC bit may be set at any time, but is typically set during a switch fundamental reset via serial
EEPROM.
PES48H12G2 allows hot-plug sensor inputs and indicator outputs to be located next to the slot or on the
plug in module. Regardless of the physical location, the indicators are controlled by PES48H12G2's down-
stream port.
Hot-Plug Signals
All PCIe defined hot-plug signals are supported on each port using low cost external I/O expanders.
Table 10.1 lists the hot-plug inputs and outputs that may be associated with a slot. When enabled during
configuration in the PCIESCAP register, these inputs and outputs are made available to external logic using
an external I/O expander located on the master SMBus interface.
Signal
PxAIN
PxAPN
PxILOCKP
PxMRLN
PxPDN
PxPEP
PxPFN
PxPIN
PxPWRGDN
PxRSTN
1.
x corresponds to port number (i.e., 0 through 9, 12, 13).
The negated value for an unused hot-plug I/O expander or GPIO output is the value shown in Table
10.2. The value is equal to the default vale as indicated by the signal name suffix (i.e., N for active low and
P for active high) modified as indicated by the corresponding invert polarity bit in the Hot-Plug Configuration
Control (HPCFGCTL) register.
Type
Name/Description
1
O
Port x
Attention Indicator Output.
I
Port x Attention Push button Input.
O
Port x Electromechanical Interlock.
I
Port x Manually-operated Retention Latch (MRL) Input.
I
Port x Presence Detect Input.
O
Port x Power Enable Output.
I
Port x Power Fault Input.
O
Port x Power Indicator Output.
I
Port x Power Good Input (asserted when slot power is good).
O
Port x Reset Output.
Table 10.1 Port Hot Plug Signals
10 - 3
April 5, 2013
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