Design Checklist

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

Signal Names

Connection

 

 

SMBCLK,

Connect to all devices on SMBus. 2.7K ohm pull-up to VCC3. This value may

SMBDATA

need to be adjusted based on bus loading.

 

 

SMEMR#, SMEMW#

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

 

 

SMI#

430 ohm pull-up to 2.5V. This is an open drain output from PIIX4E. UP:

Connected to CPU. DP: Connected to IOAPIC.

 

 

 

SPKR

Connect to speaker circuit.

 

 

STOP#

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

PCI slots, and PIIX4E.

 

 

 

STPCLK#

Connected to CPUs. 430 ohm pull-up to 2.5V. This is an open drain output from

the PIIX4E.

 

 

 

SUSA#

No connect, or connected to CK100 power down control with 10K ohm pull-up

to VCC3.

 

 

 

SUSB# / GPO15

No connect.

 

 

SUSC# / GPO16

Controls ATX power supply.

 

 

SUSCLK

No Connect

 

 

SUS_STAT[2:1]# /

No Connect

GPO[21:20]

 

 

 

SYSCLK

Connect to LM79 and ISA slots.

 

 

TC

Connect to SIO and ISA slots.

 

 

TEST#

8.2K ohm pull-up to 3VSB.

 

 

THERM# / GPI8

Connected to LM75. 8.2K ohm pull-up to VCC3.

 

 

TRDY#

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

PCI slots, and PIIX4E.

 

 

 

USBPx+-

47pF cap to ground with 27 ohm series resistor to USB port. These should be

placed as close as possible to the PIIX4E.

 

 

 

VBAT

Connect to battery circuit.

 

 

VREF

Connect to 82443GX and power supply sequencing circuit. See PIIX4E data

sheet.

XDIR# / GPO22

Connect to SIO.

 

 

XOE# / GPO23)

Connect to SIO.

 

 

ZEROWS#

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

 

 

ZZ / GPO19

No connect.

 

 

Intel®440GX AGPset Design Guide

3-19

Page 78 Page 80
Page 79
Image 79
Intel 440GX manual PIIX4E Connectivity Sheet 4
Page 78 Page 80

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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