PCI Clock Distribution and Matching Requirements | Intel 41110

PCI-X Layout Guidelines

distributed to each PCI device. The 41110 provides seven buffered clocks on the PCI bus to connect to multiple PCI-X devices. The Figure 16 shows the use of four PCI “A” clock outputs and length matching requirements. . The recommended clock buffer layout are specified as follows:

•Match each of the used the 41110 output clock lengths A_CLK[6:0] to within 0.1”to help keep the timing within the 0.5 ns maximum budget.

•Keep the distance between the clock lines and other signals “d” at least 25 mils from each other.

•Keep the distance between the clock line and itself “a” at a minimum of 25 mils apart (for serpentine clock layout).

•A_CLKIN gets connected to A_CLKO6 through a 22Ω +/- 1% resistor The 22 +/- 1% Ω resistor is within 500 mils of A_CLKO.

Figure 16. PCI Clock Distribution and Matching Requirements

Serial to

Parallel PCI

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Intel® 41110 Serial to Parallel PCI Bridge Design Guide

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Intel 41110 manual PCI Clock Distribution and Matching Requirements

Contents

Design Guide Intel 41110 Serial to Parallel PCI Bridge Intel 41110 Serial to Parallel PCI Bridge Design Guide Contents Tables Figures Contents Date Revision Description March 001 Initial release Revision History Terminology and Definitions About This DocumentTerminology and Definitions Sheet 1 Term Definition Terminology and Definitions Sheet 2 About This Document PCI Express Interface Features PCI-X Interface FeaturesIntroduction2 SMBus for configuration register initialization Power ManagementSMBus Interface Introduction Microcontroller Connections to Microcontroller Block Diagram Related Documents Jtag Intel 41110 Serial to Parallel PCI Bridge Applications Block Diagram Adapter Card Block Diagram Package Information Package Specification Package Information Bridge Package Dimensions Side View 41110 Decoupling Guidelines Power Plane Layout Power Plane Layout Decoupling Guidelines Split Voltage Planes41110 300 PCI Reset and Power Timing Considerations5 ARST# and PERST# Timing RequirementsVCC15 and VCC33 Voltage Requirements Reset and Power Timing Considerations General Routing Guidelines General Routing GuidelinesCrosstalk General Routing Guidelines EMI Considerations Power Distribution and Decoupling Trace ImpedanceDecoupling Cross Section of Differential Trace Differential Impedance Board Layout Guidelines Adapter Card TopologyAdapter Card Stack Up, Microstrip and Stripline Adapter Card Stackup Board Layout Guidelines PCI-X Layout Guidelines AINT# Interrupt Pins PCI Express INTx MessageInterrupts INTx Routing Table Interrupt Routing for Devices Behind a Bridge PCI ArbitrationPCI-X Layout Guidelines Interrupt Binding for Devices Behind a Bridge PCI Resistor Compensation PCI General Layout Guidelines PCI Clock Layout Guidelines PCI-X SignalsPCI Pullup Resistors Not Required PCI/PCI-X Frequency/Mode Straps PCI Clock Distribution and Matching Requirements Parameter Routing Guidelines PCI-X Clock Layout Requirements Summary PCI-X Topology Layout Guidelines 41110 Layout AnalysisPCI-X Slot Guidelines Embedded PCI-X 133 MHz Embedded PCI-X 133 MHz Routing RecommendationsParameter Routing Guideline for Lower AD Bus Embedded PCI-X 100 MHz Routing Recommendations Embedded PCI-X 100 MHz PCI-X 66 MHz Embedded Routing Recommendations PCI-X 66 MHz Embedded Topology PCI 66 MHz Embedded Table PCI 66 MHz Embedded Topology PCI 33 MHz Embedded Routing Recommendations PCI 33 MHz Embedded Mode Topology General recommendations PCI Express Layout Adapter Card Layout Guidelines PCI-Express Layout GuidelinesPCI Express Layout Adapter Card Routing Recommendations Sheet 1 Adapter Card Routing Recommendations Sheet 2 This page intentionally left blank Circuit Implementations Config10.1 41110 Analog Voltage Filters Circuit Implementations PCI Express Analog Voltage Filter PCI Analog Voltage Filters PCI Express Analog Voltage Filter Circuit Bandgap Analog Voltage Filter Bandgap Analog Voltage Filter Circuit 10.2 41110 Reference and Compensation Pins SMBUs Address Configuration SM BusBit Value This page intentionally left blank Customer Reference Boards Layer Type Thickness Copper WeightBoard Stack-up CRB Board Stackup Sheet 1 Impedance MaterialCustomer Reference Boards CRB Board Stackup Sheet 2 Mechanical Outline Board Outline This page intentionally left blank PCI Express Interface Signals Design Guide ChecklistSignals Recommendations Reason/Impact PERCOMP10 PCI/PCI-X Interface Signals Sheet 1 Design Guide Checklist Miscellaneous Signals PCI/PCI-X Interface Signals Sheet 2 Recommendations Reason/Impact SMBus Interface Signals Ballout Pin Name Usage Reset Pins Signal Recommendations Reason/Impact Power and Ground Signals Jtag Signals This page intentionally left blank