100 MHz GTL+ Layout Guidelines for the Pentium® II Processor and Intel 440BX AGPset
The Pentium® II processor is the latest processor in the family of Intel Architecture
microprocessors. The Pentium II processor extends the power of the Pentium Pro processor and
adds the capability of MMX™ media enhancement technology. The Pentium II processor
maintains binary compatibility with the 8086/88, 80286, Intel386™, Intel486™, Pentium and
Pentium Pro processors. The design of the Pentium II processor system bus enables the
Pentium II processor to be “multiprocessor ready. The Pentium II processor implements a
synchronous, latched bus protocol that allows a full clock cycle for signal transmission and a
full clock cycle for signal interpretation and generation. The Pentium II processor bus uses low-voltage-
swing GTL+ I/O buffers, making high frequency signal communication between
multiple loads easier.
The goal of this layout guideline is to provide a system designer with the necessary information
for designing the printed circuit board layout of a 100 MHz GTL+ system bus using the
Pentium II processor and Intel 440BX AGPset. This document provides methodologies and
guidelines that are to be used with good engineering practices in designing your system. It does
not provide hard and fast rules. See the Pentium II processor datasheet and the applicable
chipset specification for component specific electrical details. Intel strongly recommends
running analog simulations using the available I/O buffer models together with layout
information extracted from your specific design, especially if the design deviates from the layout
recommendations of section 4. In addition, for designs that are based on the layout
recommendations, simulation will confirm adherence to the guidelines.
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