Specifications

PENTIUM® PRO PROCESSOR AT 150, 166, 180, and 200 MHz E

Table 31. Header 8 Pin Reference

Pin Name I/O Usage Function

12 V

Input Required +12V±5% Supply

5 V

Input Required +5V±5% Supply

Input Required Ground Reference

OUTEN Input Optional When driven high this input will enable the OEM VRM output

and float the OverDrive

VRM output. When this input is

driven low, the output of the OEM module will float and the

OverDrive VRM output will be enabled.

PWRGOOD Output Optional Power Good is driven high upon the VRM output reaching

valid levels. This output requires an external pull-up resistor

(~10KΩ).

RES No

connect

Reserved for future use.

UP# Input Required This signal is held high via an external pull-up resistor on the

open collector output of the Pentium

Pro processor, and is

driven low by the grounded output of the OverDrive

processor.

P Output Required Voltage Regulator Module core voltage output. Voltage level

for the OverDrive processor will be lower than for the

Pentium Pro processor.

VID3-VID0 Inputs Optional Used by the Pentium Pro processor VRM to determine what

output voltage to provide to the CPU. The OverDrive VRM

does not require these pins to be connected as it will be

voltage matched in advance to the OverDrive processor.

Refer to Table 1 for Voltage ID pin decoding.

NOTE:

• The OverDrive

Voltage Regulator Module requires both 5 V and 12 V. Routing for the 5 V VRM supply must support the

full requirements of the OverDrive VRM given in Table 34 even if the 12 V supply is utilized for the OEM VRM.