82801E datasheet(48/84 Pages) INTEL

48 / 84 page

Intel® 82801E C-ICH

Advance Information Datasheet

3.2.20

Power and Ground

GPIO[21]

Fixed as Output only. Main power well.

GPIO[20:18]

Fixed as Output only. Main power well.

GPIO[17:16]

Fixed as Output only. Main Power Well. Can instead be used for PC/PCI

GNT[A:B]#. GPIO[17] can also alternatively be used for PCI GNT[5]#. Integrated

pull-up resistor.

GPIO[15:14]

Not implemented.

GPIO[13:12]

Fixed as Input only. Main Power Well. Not muxed.

GPIO[11]

Fixed as Input only. Main Power Well. Can instead be used for SMBALERT#.

GPIO[10:9]

Not implemented.

GPIO[8]

Fixed as Input only. Main Power Well. Not muxed.

GPIO[7]

Fixed as Input only. Main power well. Not muxed.

GPIO[6]

Fixed as Input only. Main power well.

GPIO[5:4]

Fixed as Input only. Main power well. Can be used instead as PIRQ[G:H]#.

GPIO[3:2]

Reserved.

GPIO[1:0]

Fixed as Input only. Main Power Well. Can instead be used for PC/PCI

REQ[A:B]#. GPIO[1] can also alternatively be used for PCI REQ[5]#.

Table 26. Power and Ground Signals

Name

Description

HUBREF

0.9 V reference for the hub interface.

V5REF

Reference for 5 V tolerance on Core well inputs.

VBIAS

RTC well bias voltage. The DC reference voltage applied to this pin sets a current that is

mirrored throughout the oscillator and buffer circuitry. See “External RTC Circuitry” on

page 50.

Vcc1_8

1.8 V supply for Core well logic.

Vcc3_3

3.3 V supply for Core well I/O buffers.

VccRTC

3.3 V (can drop to 2.0 V min. in G3 state) supply for the RTC well. This power is not

expected to be shut off unless the RTC battery is removed or completely drained.

NOTE: Implementations should not attempt to clear CMOS by using a jumper to pull

VccRTC low. Clearing CMOS in an 82801E C-ICH-based platform can be done

by using a jumper on RTCRST# or GPI, or using SAFEMODE strap.

V_CPU_IO

processor interface outputs.

Vss

Ground.

Table 25. General Purpose I/O Signals (Sheet 2 of 2)

Name

Type

Description

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