Intel 440GX, Design Manual

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Intel
®
440GX AGPset Design Guide 1-9
Introduction
1.4.2 General Design Recommendations
1. Intel recommends using an industry standard programmable Voltage Regulator Module
(VRM) installed in a VRM header or an onboard programmable voltage regulator designed for
Intel
®
Pentium
®
II processors.
2. Systems should be capable of varying the system bus to processor core frequency ratio per the
System Bus to Core Frequency Multiplier Configuration table of the Intel
®
Pentium
®
II
processor datasheet. The Intel
®
Pentium
®
II processor uses the following signals to configure
the internal clock multiplier ratio: LINT[0]/INTR, IGNNE#, A20M#, LINT[1]/NMI. Follow
the recommendations in this document to ensure that adequate hold times are met on the
strapping signals. Ensure the output of the strapping logic is a Vcc
2.5
logic level for connection
to the Slot 1 connector. This can be accomplished using an open-drain output driver with pull-
ups to Vcc
2.5
.
3. Please prepare for additional thermal margin for increases of 1-5W for higher performance or
otherwise enhanced processor.
4. Motherboard designs targeted for system integrators should design to the Boxed Intel
®
Pentium
®
II processor electrical, mechanical and thermal specifications provided in the Intel
®
Pentium
®
II processor datasheet, most notably the required fan power header, fan/heatsink
physical clearance on the motherboard.
5. Motherboard designs should incorporate a retention mechanism, retention mechanism attach
mount and heatsink support mounting holes and keep out areas for the Intel
®
Pentium
®
II
processor and boxed Intel
®
Pentium
®
II processor.
1.4.3 Transitioning from Intel

440BX AGPset to Intel

440GX
AGPset Design
1. The 82443GX supports 2GB using 128M or 256M memory technology. The design guidelines
for MAA14 and MAB14 are the same as MAA-13 and MAB-13 on the 82443BX.
2. Intel
®
440GX AGPset supports 100 MHz system bus and 100 MHz SDRAM Memory only.
3. There is no 3 DIMM support with the Intel 440GX AGPset.