PCI-X Layout Guidelines, Interrupts | Intel 41110 guide

PCI-X Layout Guidelines

8

This chapter describes several factors to be considered with a 41110 PCI/PCI-X design. These include the PCI IDSEL, PCI RCOMP, PCI Interrupts and PCI arbitration.

8.1Interrupts

PCI Express provides interrupt messages that emulate the legacy wired mechanism. This allows IO devices to signal PCI-style interrupts using a pair of ASSERT and DEASSERT messages This message pairing preserves the level-sensitive semantics of the PCI interrupts on PCI Express.

The 41110 uses four interrupts - A_INTA:A_INTD on bus A segment corresponding to the four interrupts defined in the PCI specification. The 41110 routes its PCI interrupt pins and the internal interrupts to PCI Express INTx interrupts according to Table 4.

Table 4. INTx Routing Table

A_INT# Interrupt Pins	PCI Express INTx Message

A_INTA	INTA

A_INTB	INTB

A_INTC	INTC

A_INTD	INTD

The 41110 will use its primary bus number and device number in the Requester ID field for the PCI Express INTx messages. As stated in the PCI Express specification, the function number is reserved for interrupt messages and will always be 0.

Intel® 41110 Serial to Parallel PCI Bridge Design Guide

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Intel 41110 manual PCI-X Layout Guidelines, Interrupts, INTx Routing Table, AINT# Interrupt Pins PCI Express INTx Message

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 Introduction2 PCI Express Interface FeaturesPCI-X Interface Features 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 VCC15 and VCC33 Voltage Requirements Reset and Power Timing Considerations5ARST# and PERST# Timing Requirements Reset and Power Timing Considerations Crosstalk General Routing GuidelinesGeneral Routing Guidelines General Routing Guidelines EMI Considerations Decoupling Power Distribution and DecouplingTrace Impedance Cross Section of Differential Trace Differential Impedance Adapter Card Stack Up, Microstrip and Stripline Board Layout GuidelinesAdapter Card Topology 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 Slot Guidelines PCI-X Topology Layout Guidelines41110 Layout Analysis Parameter Routing Guideline for Lower AD Bus Embedded PCI-X 133 MHzEmbedded PCI-X 133 MHz Routing Recommendations 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 Bit Value SMBUs Address ConfigurationSM Bus 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