Design Checklist

One resistor per IDE connector is recommended for all signals. For signals labeled as 22-47Ω, the correct value should be determined for each unique motherboard design, based on signal quality.

Figure 3-4. Series Resistor Placement for Primary IDE Connectors

 

74HCT14

22 - 47 ohm

 

RSTDRV

 

Reset#

 

 

 

P D D 7

10K ohm

 

 

33 ohm

 

PDD[15:0]

 

 

 

 

 

PDA[2:0]

 

33 ohm

 

 

 

 

PDCS1#

 

33 ohm

 

 

 

 

PDCS3#

 

33 ohm

 

 

 

 

PDIOR#

 

33 ohm

 

 

33 ohm

 

PDIOW#

 

Connector

 

 

PDDACK#

 

22 - 47 ohm

 

22 - 47 ohm

IRQ14

 

 

33 ohm

IDE

PDDREQ

 

 

 

Primary

 

5V

5 . 6k ohm

 

 

 

1k ohm

 

 

PIORDY

 

 

 

 

 

470 ohm

CSEL

 

 

 

PIIX4E

 

N.C.

Pin32,34

 

 

 

 

 

 

v 0 1 0

RESET comes from the PIIX4E RSTDRV signal through a Schmitt trigger

The design consideration shown above illustrates the series resistor placement for trace lengths not exceeding 4 inches. Note that if the trace length between the PIIX4E and the IDE header exceeds 4 inches, the series resistors should be placed within 1 inch of the PIIX4E. The series termination resistors are required in either design.

Intel®440GX AGPset Design Guide

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Intel 440GX manual Reset#, PDD150 PDA20, Pin32,34, Ide
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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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