Advanced System Bus Design; Agtl+ Design Guidelines - Intel 810A3 Design Manual

Advanced System Bus Design

This chapter discusses more detail about the methodology used to develop the guidelines.
Section 5.1, "AGTL+ Design Guidelines" on page 5-1
a step-by-step methodology that Intel has successfully used to design high performance desktop
systems. Section 5.2, "Theory" on page 5-10
layout guideline.
insights. The items in
step-by-step methodology. This section also includes equations that may be used for reference.
5.1

AGTL+ Design Guidelines

The following step-by-step guideline was developed for systems based on two processor loads and
one GMCH load. Systems using custom chipsets will require timing analysis and analog
simulations specific to those components.
The guideline recommended in this section is based on experience developed at Intel while
developing many different Intel Pentium
based systems. Begin with an initial timing analysis and topology definition. Perform pre-layout
analog simulations for a detailed picture of a working "solution space" for the design. These pre-
layout simulations help define routing rules prior to placement and routing. After routing, extract
the interconnect database and perform post-layout simulations to refine the timing and signal
integrity analysis. Validate the analog simulations when actual systems become available. The
validation section describes a method for determining the flight time in the actual system.
Guideline Methodology:
•
Initial Timing Analysis
•
Determine General Topology, Layout, and Routing
•
Pre-Layout Simulation
— Sensitivity sweep
— Monte Carlo Analysis
•
Place and Route Board
— Estimate Component to Component Spacing for AGTL+ Signals
— Layout and Route Board
•
Post-Layout Simulation
— Interconnect Extraction
— Inter-Symbol Interference (ISI), Cross-talk, and Monte Carlo Analysis
•
Validation
— Measurements
— Determining Flight Time
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Intel 810A3 Chipset Design Guide
Section 5.3, "More Details and Insight" on page 5-13
Section 5.3 expand on some of the rationale for the recommendations in the
®
Pro processor family and Intel Pentium III processor-
Advanced System Bus Design
discusses specific system guidelines. This is
introduces the theories that are applicable to this
5
contains more details and
5-1