Table A-23 Hot-Plug Indicator Board Connector Pinout (J3D1) - Silicon Graphics 1450 Maintenance Manual

A: Technical Reference
114
system to enable and initialize the PHP slot, the user momentarily presses the switch
again.
Note: At this time, the Linux operating system does not support use of the PCI hot-plug
(PHP) feature. If you are running Linux, your system must be turned off before installing
or removing PCI boards. Windows 2000 requires drivers that are PHP compatible in
order to use the PHP feature.
This (active low) switch for the respective slot is routed to the PRSNT1# input to the PCI
hot-plug Controller (PHPC). This switch should not be confused with slot-interlock
switches, which are used in conjunction with mechanical lever designs to prevent access
to an energized PHP slot. The slot interlock inputs into the PHPC are permanently pulled
down to ground and are not accessible through the hot-plug PCI indicator board
interface.
Note: The HW push-button is located on the hot-plug indicator board. Do not use this
button to turn power on and off to the PCI slot. In some instances, pressing this button
interrupts normal operation of the operating system. Instead, turn power off using a
hot-plug PCI application.
The hot-plug PCI indicator board (HPIB) interface contains the necessary signals to drive
the LEDs and receive the push-button signals.
A 20-pin connector is provided on the baseboard for connection to the external HPIB.
Table A-23 shows the cable pinout assignments for the this connector.
Hot-Plug Indicator Board Connector Pinout (J3D1)
Table A-23
Connector
Contact Signal Name
1 Vcc
3 P64_A_SWITCH<0>
5 P64_A_AMB_LED<0>
7 P64_A_GRN_LED<1>
9 P64_B_SWITCH<0>
Connector
Contact Signal Name
2 GROUND
4 P64_A_GRN_LED<1>
6 P64_A_SWITCH<1>
8 P64_A_AMB_LED<1>
10 P64_A_GRN_LED<0>
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