Design Checklist

Third, if the design currently uses an in-line active gate/buffer on PCIRST# to drive the PCI bus, consider removal of this gate/buffer entirely. The PIIX4/PIIX4E is designed to drive the entire PCI bus.

Table 3-10. Non-PIIX4E PCI Signals

 

SIGNAL

 

 

CONNECTION

 

 

 

 

 

 

ACK64#,

 

(5V PCI environment) 2.7K ohm pull-up resistors to 5V.

 

 

(3V PCI environment) 10K ohm pull-up resistors to 3.3V.

 

PERR#,

 

 

 

PERR# and PLOCK# can be connected together across PCI slots and pulled

 

PLOCK#,

 

 

 

up by single resistor.

 

REQ64#

 

 

 

Each REQ64# and ACK64# requires its own pull-up.

 

 

 

 

 

 

 

 

 

GNT[3:0]#

 

Connected between PCI slots and 82443GX. 8.2K ohm pull-up to VCC3.

 

 

 

 

 

 

IDSEL lines to PCI connectors

 

100 ohm series resistor recommended per the PCI spec.

 

 

 

 

 

 

SBO#,

 

5.6K ohm pull-up to VCC.

 

SDONE

 

 

 

 

 

 

 

 

 

 

3.9

ISA Signals

 

 

Table 3-11. Non-PIIX4E ISA Signals

 

 

 

 

 

 

 

SIGNAL

 

CONNECTION

 

 

 

 

 

OSC1

 

Connected to CK100 through 22 ohm resistor.

 

 

 

 

 

RMASTER#

 

1K ohm pull-up to VCC.

 

 

 

 

 

3.10ISA and X-Bus Signals

•The PIIX4E will support a maximum of 5 ISA slots.

•XOE# and XDIR# are connected to the ULTRA I/O device.

•If internal RTC is used, RTCALE and RTCCS# are no connect or become general purpose outputs by programming the General Configuration Register(GENCFG) in the Function 0, offset B0h–B3h.

•The LM79 is connected to the X-Bus due to the functionality of the PGCS[1:0]# pins on the PIIX4E.

Intel®440GX AGPset Design Guide

3-23

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Intel 440GX manual ISA and X-Bus Signals, Non-PIIX4E PCI Signals, Non-PIIX4E ISA Signals
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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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