Debug Recommendations

Figure 4-1. LAI Probe Input Circuit

The extra loading of the LAI562 requires stronger pull-up values on the target system. However, due to the current limitations of some signal drivers, this stronger value may not be feasible. Calculation of the correct pull-up resistor value for each of the CMOS signals should include a load analysis based on the pull-up voltage, pull-up voltage tolerance, pull-up resistor tolerance, V IH and V IL specifications, driver current rating, input current leakage, input timings, etc. The resulting values may conflict.

As a result of the extra loading the following compromise pull-ups to Vcc 2.5 are recommended. The actual value required by your system may vary depending on the logic connected and the drive strength of the signal to the Slot 1 connector.

Inputs to the Slot 1 connector from the ITP562 Port:

•

PREQ#

150

- 330 ohm

•

TDI

150

- 330 ohm

•

TMS, TCK

1 Kohm

•

TRST#

470

- 680 ohm (A pull-down is recommended but a pull-up may

 

 

be used)

Inputs to the Slot 1 connector from the PIIX4E:

•

STPCLK#

430 ohm

•

SMI#

430 ohm

•

SLP#

150 - 330 ohm

Outputs from the Slot 1 connector:

•

TDO

150 ohm

•

THERMTRIP#

150 - 220 ohm

•

FERR#

150 - 220 ohm

Intel®440GX AGPset Design Guide

4-3

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Intel 440GX manual 150 330 ohm, Kohm, 430 ohm, 150 ohm, 150 220 ohm
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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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