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Intel 440GX User Manual

Page 71

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Intel

®

440GX AGPset Design Guide

3-11

Design Checklist

GADSTBA,
GADSTBB,
GDEVSEL#
,
GFRAME#, GGNT#,
GIRDY#, GREQ#,

GSTOP#, GTRDY#,

8.2K ohm pull-ups to 3.3V. Connected to AGP connector.

GPAR

100K ohm pull-down required. Connect to AGP connector.

GTLREFA, GTLREFB

GTL buffer voltage reference input (1.0V = 2/3 vtt)

HA[31:3]#

Connected to CPUs.

HCLKIN

Connected to CK100 through 22 ohm series resistor.

HD[63:0]#

Connected to the CPUs.

HIT#, HITM#

Connected to CPUs.

HLOCK#

Connected to CPUs.

HREQ[4:0]#

Connected to CPUs.

HTRDY#

Connected to CPUs.

IRDY#

2.7K ohm pull-up to 5V. Connected to PCI bus.

MAA[14:0]

Connected to DIMM0 and DIMM1.

MAB[14, 13, 10],
MAB[11, 9:0]#

Connected to DIMM2 and DIMM3.

MD[63:0], MECC[7:0]

Connected to each DIMM. FET Switch Design: Connected to FET switches.

PAR

Connected to PCI bus.

PCIRST#

Connected to PIIX4E, AGP connector, and PCI connectors.

PCLKIN

Connected to CK100 through 22 ohm series resistor.

PGNT[4:0]#

8.2K ohm pull-ups to 3.3V. Connected to PCI connectors.

PHLDA#

8.2K ohm pull-up to 3.3V. Connected to PIIX4E.

PHOLD#

8.2K ohm pull-up to 3.3V. Connected to PIIX4E.

PIPE#

8.2K ohm pull-ups to 3.3V. Connected to AGP connector.

PLOCK#

2.7K ohm pull-up to 5V. Connected to PCI connectors.

PREQ[4:0]#

2.7K ohm pull-ups to 5V. Connected to PCI connectors (except PREQ4#).

RBF#

8.2K ohm pull-up to 3.3V. Connected to AGP connector.

REFVCC5

PCI 5V reference voltage for 5V tolerant buffers.

RS[2:0]#

Connected to CPUs.

SBA[7:0]

Connected to AGP connector.

SBSTB

8.2K ohm pull-up to 3.3V. Connected to AGP connector.

SCAS[B:A]#

Each connected to up to 2 DIMMs.

SERR#

2.7K ohm pull-up to 5V. Connected to PCI bus.

SRAS[B:A]#

Each connected to up to 2 DIMMs.

ST[2:0]

Connected to AGP connector.

STOP#

2.7K ohm pull-up to 5V. Connected to PCI bus.

SUSTAT#

10K ohm pull-up to 3.3V. Connect to PIIX4E for POS implementation.

TESTIN#

8.2K ohm pull-up to 3.3V which may be removed if validation permits.

Table 3-4. 82443GX Connectivity (Sheet 2 of 3)

SIGNAL

CONNECTION