Debug Recommendations

Inputs to the Slot 1 connector, from system logic (assuming a 14mA driver):

•

PWRGOOD

150 - 330 ohm

•

INIT#

150 - 330 ohm

•

LINT[0]/INTR

150 - 330 ohm

•

LINT[1]/NMI

150 - 330 ohm

•

IGNNE#

150 - 330 ohm

•

A20M#

150 - 330 ohm

Bi-directional signal to/from the Slot 1 connector:

•

PICD[0]#

150 ohm

•

PICD[1]#

150 ohm

Inputs to the Slot 1 connector, only pull-up:

• FLUSH#

510 ohm

4.3.2Debug Logic Recommendations

Debug Recommendations are intended to assist in the development of the Intel® Pentium® II processor system and products utilizing it. The following are strongly recommended for early prototype designs only.

•Provide a push button reset circuit, do not rely on power-on reset from the power supply. A push-button reset usually results in more repeatable results when debugging initialization problems.

•Include a Intel® Pentium® II processor debug port connector. Intel cannot provide debug assistance without this connection. See the Integration tools chapter of the processor datasheet for schematics and a signal checklist. Be sure it is the proper 0.050” x .100” (1.27mm x 4mm) spacing connector.

•Provide the capability to measure the processor’s case temperature (Tplate) to ensure that the maximum temperature specification per processor Intel® Pentium® II Processor Datasheet.

•Place an SMA style (or similar) coaxial connector on the power plane between the VRM Header or on board voltage regulator and Slot 1 connector so that power plane noise can be monitored on systems. Note: an SMA to BNC cable for an oscilloscope may be needed as well. This component would only be placed during design evaluation.

•For DP systems, an empty Slot 1 connector is not allowed because one end of the bus termination would be missing.

•The ITP565 requires a complete boundary scan chain. For a DP system It is recommended that jumpers be placed on the motherboard to allow the boundary scan chain to bypass an “empty processor slot”.

•TRST# must be driven low during reset to all components with TRST# pins. Connecting a pull-down resistor to TRST# will accomplish the reset of the port.

Intel®440GX AGPset Design Guide

4-4

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Intel 440GX manual Debug Logic Recommendations, A20M# 150 330 ohm, PICD0# 150 ohm PICD1#
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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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