Design Checklist

Table 3-7. PIIX4E Connectivity (Sheet 2 of 4)

Signal Names

Connection

 

 

IOCHCK#

Connected to ISA slots. 4.7K ohm pull-up to VCC.

 

 

IOCHRDY

Connected to ISA slots and Ultra I/O. 1K ohm pull-up to VCC.

 

 

IOCS16#

Connected to ISA slots. 1K ohm pull-up to VCC.

 

 

IOR#

Connected to ISA slots, Ultra I/O, LM79. 8.2K ohm pull-up to VCC.

 

 

IOW#

Connected to ISA slots, Ultra I/O, LM79. 8.2K ohm pull-up to VCC.

 

 

IRDY#

2.7K ohm pull-up to 5V or 10K ohm pull-up to 3V. Connect between 82443GX,

PCI slots, and PIIX4E.

 

 

 

IRQ0 / GPO14

UP: No connect. DP: Connected to INTIN2 of IOAPIC.

 

 

IRQ8#

8.2K ohm pull-up to 3VSB. DP: Connected to IOAPIC through tri-state buffer.

 

 

IRQ[1,3:7]

8.2K ohm pull-up to VCC. Connected to ISA slots and Ultra I/O.

DP: Connected to IOAPIC.

 

 

 

IRQ[15:14]

Connected to ISA slots, Ultra I/O, IDE. 8.2K ohm pull-up to VCC.

DP: Connected to IOAPIC.

 

 

 

IRQ[9:12]

Connected to ISA slots, Ultra I/O. 8.2K ohm pull-up to VCC.

DP: Connected to IOAPIC.

 

 

 

KBCCS# / GPO26

No Connect.

 

 

LA[17:23]

Connected to ISA slots. 8.2K ohm pull-up to VCC.

 

 

LID / GPI10

8.2K ohm pull-down if LID is not used. Connect to wake on LAN Header if used.

 

 

MCCS#

No connect.

 

 

MEMCS16#

Connected to ISA slots. 1K ohm pull-up to VCC.

 

 

MEMR#,

Connected to ISA slots and Flash. 8.2K ohm pull-up to VCC.

MEMW#

DP: Connected to IOAPIC.

 

 

NMI

Part of CPU/bus frequency circuit. 2.7K ohm pull-up to 3V.

 

 

OCx

Driven by USB overcurrent detection voltage divider.

 

 

OSC

Connect to CK100.

 

 

PAR

Connect to PCI slots and 82443GX.

 

 

PCICLK

Connect to CK100.

 

 

PCIRST#

Connect to AGP, PCI, and 82443GX.

 

 

PCI_STP# / GPO18

No connect, or connected to CK100 with 10K ohm pull-up to 3VSB.

 

 

PCS1#

Connected to IDE connector through 33 ohm series resistor.

 

 

PCS3#

Connected to IDE connector through 33 ohm series resistor.

 

 

PDA[2:0]

Connected to IDE connector through 33 ohm series resistors.

 

 

PDD[15:0]

Connected to IDE connector through 33 ohm series resistors. It is

recommended that PDD[7] have a 10K ohm pull-down resistor.

 

 

 

PDDACK#

Connected to IDE connector through 33 ohm series resistor.

 

 

PDIOR#

Connected to IDE connector through 33 ohm series resistor.

 

 

PDIOW#

Connected to IDE connector through 33 ohm series resistor.

 

 

PDREQ

Connected to IDE through 33 ohm series resistor. 5.6K ohm pull-down on the

PIIX4E side of the series resistor.

 

 

 

PGCS#0

No connect.

 

 

PGCS#1

8.2K ohm pull-up to VCC3. Connected to LM79.

 

 

Intel®440GX AGPset Design Guide

3-17

Page 76 Page 78
Page 77
Image 77
Intel 440GX manual PIIX4E Connectivity Sheet 2
Page 76 Page 78

440GX specifications

The Intel 440GX chipset was launched in 1997 as part of Intel's series of chipsets known as the 440 family, and it served as a critical component for various Pentium II and Pentium III-based motherboard architectures. Specifically designed for the second generation of Intel’s processors, the 440GX delivered enhanced performance and supported a range of important technologies that defined PC architectures of its time.

One of the main features of the Intel 440GX was its support for a 100 MHz front-side bus (FSB), which significantly improved data transfer rates between the CPU and the memory subsystem. This advancement allowed the 440GX to accommodate both the original Pentium II processors as well as the later Pentium III chips, providing compatibility and flexibility for system builders and consumers alike.

The 440GX chipset included an integrated AGP (Accelerated Graphics Port) controller, which supported AGP 2x speeds. This enabled high-performance graphics cards to be utilized effectively, delivering many enhanced graphics capabilities for gaming and multimedia applications. The AGP interface was crucial at the time as it offered a dedicated pathway for graphics data, increasing bandwidth compared to traditional PCI slots.

In terms of memory support, the 440GX could address up to 512 MB of SDRAM, allowing systems built with this chipset to run comfortably with sufficient memory for the era’s demanding applications. The memory controller was capable of supporting both single and double-sided DIMMs, which provided versatility in memory configuration for system builders.

Another notable feature of the Intel 440GX was its support for multi-processor configurations through its Dual Processors support feature. This allowed enterprise and workstation computers to leverage the performance advantages of multiple CPUs, making the chipset suitable for business and professional environments where multitasking and high-performance computing were essential.

On the connectivity front, the chipset supported up to six PCI slots, enhancing peripheral device integration and expansion capabilities. It also included integrated IDE controllers, facilitating connections for hard drives and CD-ROM devices.

Overall, the Intel 440GX chipset represented a balanced combination of performance, flexibility, and technology advancements for its time. Its introduction helped establish a foundation for subsequent advancements in PC technology and set the stage for more powerful computing systems in the years to come.
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