Design Checklist

used by other logic requiring CMOS/TTL logic levels. The VID lines on the Slot 1 connector are 5V tolerant.

•Vcc (±5%) should be provided to the Slot 1 signal Vcc pin B109. This power connection is not used by the Intel® Pentium® II processor. It is required for the Slot 1 EMT tool and may be required by future Boxed processors.

•The JTAG port must be properly terminated even if it is not used. See the Debug Recommendations for further information that may affect these resistor values.

•The EMI pins of the Slot 1 connector (pins B1, B41, B61, B81 and B100) should be connected to system or chassis ground through zero ohm resistors. The determination to install these resistors is design dependent and can be determined through empirical methods.

•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.

•If two Vtt regulators are used, one at each end of the bus, Intel recommends connecting the two regulator outputs together with a wide trace that runs the along the same basic path as the

GTL+ signals (beware of crosstalk). VREF should be generated at each AGPset component from this combined VTT. This is simply a recommendation to minimize the effects of noise. See AP-523 Intel® Pentium® Pro Processor Power Distribution Guidelines for more information.

•A single VTT regulator may be used. For a UP system a simplistic calculation for maximum worst case current is 5.0A. This takes into consideration that some signals are not used by the Intel® 440GX AGPset.

•Motherboards planning to support the Boxed Intel® Pentium® II processor must provide a matched power header for the Boxed Intel® Pentium® II processor fan/heatsink power cable connector. The power header must be positioned within close proximity to the Slot 1 connector.

•The Slot 1 connector signal SLOTOCC# (Pin B101) is a ground on the Slot 1 processor. The presence of a CPU core can be determined from a combination of non-zero VID signals, (all ones designates “No Core”) and if the state of SLOTOCC# is low.

•ITPREQ[1:0]#, ITPRDY[1:0]# can individually be hooked to either CPU. The ITP .inf file must match the connections.

•DBRESET (ITP Reset signal) requires a 240 ohm pull-up to VCC3.

Intel®440GX AGPset Design Guide

3-6

Page 65 Page 67
Page 66
Image 66
Intel 440GX manual Design Checklist
Page 65 Page 67

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.
Top Page Image Contents