845GL datasheet(37/193 Pages) INTEL

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

Signal Description

Table 2-2 shows the VTT/VDD, VREF, RCOMP, and VSWING levels for the various interfaces.

NOTE:

1. For the Pentium 4 processor with 512-KB L2 cache on 0.13 Micron Process, VTT range is 1.29 V–1.525 V.

For the Pentium 4 processor with 256-KB L2 cache, VTT range is 1.535 V– 1.75 V

2. Refer to the Intel® Pentium® 4 Processor in 478-Pin Package and Intel® 845G/845GL/845GV Chipset

Platform Design Guide for details.

2.9

Power and Ground Signals

Table 2-2. Voltage Levels and RCOMP for Various Interfaces

Interface

VTT/VDD

(Volts)

VREF

(volts)

RCOMP

(

Ω)

RCOMP

term

Vswing

(Volts)

Core

1.5 V

Note 2

AGTL+

1.15 -1.75 V(1)

2/3 * VTT

1/3*VTT

AGP/DVO

1.5 V

0.5 * VDD

HI1.5

1.5 V

0.35

0.7

DDR - SSTL_2

1.25/2.5 V

0.5 * VDD

SDR - LVTTL

3.3 V

0.5 * VDD

Signal Name

Description

VCC

VCC for 1.5 V core.

VSS

GND supply.

VCCAGP

VCC for AGP – 1.5 V.

VCCA_FSB

Analog Vcc for the Host PLL – 1.5 V. This supply requires special filtering. Refer to the Intel®

Pentium® 4 Processor in 478-Pin Package and Intel® 845G/845GL/845GV Chipset Platform

Design Guide for details.

VTTFSB

VTT supply for PSB, having a range of 1.15 V–1.75 V.

VTTDECAP

VTT edge cap connection supply. Do not connect to MB VTT supply. Refer to the Intel®

Pentium® 4 Processor in 478-Pin Package and Intel® 845G/845GL/845GV Chipset Platform

Design Guide for implementation.

VCCA_HI

Analog VCC for the HI/AGP PLL – 1.5 V. Does not require special filtering.

VCCHL

VCC for Hub Interface – 1.5 V.

VCCA_DPLL

Analog Vcc for the Display PLL – 1.5 V. This supply requires special filtering. Refer to the

Intel® Pentium® 4 Processor in 478-Pin Package and Intel® 845G/845GL/845GV Chipset

Platform Design Guide for details.

VCCA_DAC

Analog Vcc for the DAC – 1.5 V. Refer to the Intel® Pentium® 4 Processor in 478-Pin

Package and Intel® 845G/845GL/845GV Chipset Platform Design Guide for supply

requirements.

VSSA_DAC

Analog Vss for the DAC. This supply should go directly to motherboard ground.

VCCGPIO

Vcc for GPIO – 3.3 V.

VCCSM

Vcc for System Memory – 3.3 V for SDR, 2.5 V for DDR.

VCCA_SM

Analog VCC for System Memory DLL – 1.5 V supply requires special filtering. Refer to the

Intel® Pentium® 4 Processor in 478-Pin Package and Intel® 845G/845GL/845GV Chipset

Platform Design Guide for details.

VCCQSM

Quiet VCC for System Memory – 3.3 V for SDR, 2.5 V for DDR. Supply requires special

filtering. Refer to the Intel® Pentium® 4 Processor in 478-Pin Package and Intel® 845G/

845GL/845GV Chipset Platform Design Guide for details.

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