845GL datasheet(36/193 Pages) INTEL

36 / 193 page

Signal Description

Intel® 82845G/82845GL/82845GV GMCH Datasheet

2.7

Clocks, Reset, and Miscellaneous Signals

2.8

RCOMP, VREF, VSWING Signals

Signal Name

Type

Description

HCLKP

HCLKN

CMOS

Differential Host Clock In: These pins receive a low voltage differential host clock

from the external clock synthesizer.

GCLKIN

LVTTL

66 MHz Clock In: This pin receives a 66 MHz clock from the clock synthesizer.

This clock is used by AGP and hub interface clock domains.

DREFCLK

LVTTL

Display Clock Input: This pin provides a 48 MHz input clock to the Display PLL

that is used for 2D/Video/Flat Panel and DAC.

RSTIN#

LVTTL

Reset In: When asserted, this signal asynchronously resets the GMCH logic. This

signal is connected to the PCIRST# output of the Intel® ICH4. All AGP/PCI output

and bi-directional signals will also tri-state compliant to PCI Local Bus

Specification, Revision 2.0 and PCI Local Bus Specification, Revision 2.1.

PWROK

3.3 V

GPIO

Power OK: When asserted, PWROK is an indication to the GMCH that the core

power and GCLKIN have been stable for at least 10 µs.

TESTIN#

1.5 V

CMOS

Test Input: This pin is used for manufacturing and board lever test purposes.

Signal Name

Type

Description

HDVREF_[2:0]

Host Data Reference Voltage: Reference voltage input for the data signals of the

Host AGTL+ interface.

HA_VREF

Host Address Reference Voltage: Reference voltage input for the address

signals of the Host AGTL+ interface.

HCC_VREF

Host Common Clock Reference Voltage: Reference voltage input for the

common clock signals of the Host AGTL+ interface.

HX_RCOMP

HY_RCOMP

I/O

CMOS

Host RCOMP: These pins are used to calibrate the Host AGTL+ I/O buffers.

HX_SWING

HY_SWING

Host Voltage Swing: These pins provide a reference voltage used by the PSB

RCOMP circuit. HX_SWING is used for the signals handled by HX_RCOMP, and

HY_SWING is used for the signals handled by HY_RCOMP.

SM_VREF

Memory Reference Voltage: Reference voltage input for DQ, DQS &

SRCVEN_IN#.

SMXRCOMP

SMYRCOMP

I/O

CMOS

Memory RCOMP: These pins are used to calibrate the memory I/O buffers.

AGP_VREF

AGP Reference: The reference voltage for the AGP/DVO I/O buffers is 0.75 V.

AGP_RCOMP

I/O

CMOS

Compensation for AGP: This signal is used to calibrate the AGP/DVO buffers.

This signal should be connected to ground through a 40

Ω pull-down resistor.

HI_VREF

HI Reference: Reference voltage input for the hub interface.

HI_RCOMP

I/O

CMOS

Compensation for HI: This signal is used to calibrate the hub interface I/O

buffers. This signal should be connected to 1.5 V through a 68.1

Ω 1% pull-up

resistor

HI_SWING

HI Voltage Swing: This signal provides a reference voltage used by the

HI_RCOMP circuit.

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