Intel manual 10.2 41110 Reference and Compensation Pins, Bandgap Analog Voltage Filter Circuit

Page 48

Circuit Implementations

Figure 24. Bandgap Analog Voltage Filter Circuit

Serial to

Parallel PCI

Bridge

Additional Notes:

•Place C as close as possible to package pin.

•R must be placed between the 2.5V supply and L.

•Route VCCBGPE and VSSBGPE as differential traces.

•VCCBGPE and VSSBGPE traces must be ground referenced (No 2.5V references).

•VSSBGPE should be grounded at the capacitor.

•Max total board trace length = 1.2”.

•Min trace space to other nets = 30 mils.

10.241110 Reference and Compensation Pins

There are three compensation pins on 41110.

PE_RCOMP[1:0] are two separate pins that provide voltage compensation for the PCI Express interface on the 41110. The nominal compensation voltage is 0.5V. An external 24.9Ω ±1% pullup resistor should be used to connect to VCC15. A single pullup resistor can be used to for both of these signals.

RCOMP is an analog PCI interface compensation pin, providing 0.75V to the 41110. A 100Ω ±1% pulldown resistor should be used to connect the RCOMP pin to ground.

These implementations are shown in Figure 25.

48	Intel® 41110 Serial to Parallel PCI Bridge Design Guide

Image 48

Contents Intel 41110 Serial to Parallel PCI Bridge Design GuideIntel 41110 Serial to Parallel PCI Bridge Design Guide Contents Figures TablesContents Revision History Date Revision Description March 001 Initial releaseAbout This Document Terminology and DefinitionsTerminology and Definitions Sheet 1 Term DefinitionAbout This Document Terminology and Definitions Sheet 2PCI Express Interface Features PCI-X Interface FeaturesIntroduction2 Power Management SMBus for configuration register initializationSMBus Interface IntroductionMicrocontroller Block Diagram Microcontroller Connections toJtag Related DocumentsBlock Diagram Intel 41110 Serial to Parallel PCI Bridge ApplicationsAdapter Card Block Diagram Package Specification Package InformationBridge Package Dimensions Side View Package InformationPower Plane Layout 41110 Decoupling GuidelinesPower Plane Layout Split Voltage Planes Decoupling Guidelines41110 300PCI 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 EMI Considerations General Routing GuidelinesPower Distribution and Decoupling Trace ImpedanceDecoupling Differential Impedance Cross Section of Differential TraceBoard Layout Guidelines Adapter Card TopologyAdapter Card Stack Up, Microstrip and Stripline Board Layout Guidelines Adapter Card StackupAINT# Interrupt Pins PCI Express INTx Message PCI-X Layout GuidelinesInterrupts INTx Routing TablePCI Arbitration Interrupt Routing for Devices Behind a BridgePCI-X Layout Guidelines Interrupt Binding for Devices Behind a BridgePCI General Layout Guidelines PCI Resistor CompensationPCI-X Signals PCI Clock Layout GuidelinesPCI Pullup Resistors Not Required PCI/PCI-X Frequency/Mode StrapsPCI Clock Distribution and Matching Requirements PCI-X Clock Layout Requirements Summary Parameter Routing GuidelinesPCI-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 Embedded PCI-X 100 MHz Routing RecommendationsPCI-X 66 MHz Embedded Topology PCI-X 66 MHz Embedded Routing RecommendationsPCI 66 MHz Embedded Topology PCI 66 MHz Embedded TablePCI 33 MHz Embedded Mode Topology PCI 33 MHz Embedded Routing RecommendationsPCI Express Layout General recommendationsPCI-Express Layout Guidelines Adapter Card Layout GuidelinesPCI Express Layout Adapter Card Routing Recommendations Sheet 1Adapter Card Routing Recommendations Sheet 2 This page intentionally left blank Config Circuit Implementations10.1 41110 Analog Voltage Filters Circuit ImplementationsPCI Analog Voltage Filters PCI Express Analog Voltage FilterBandgap Analog Voltage Filter PCI Express Analog Voltage Filter Circuit10.2 41110 Reference and Compensation Pins Bandgap Analog Voltage Filter CircuitSMBUs Address Configuration SM BusBit Value This page intentionally left blank Layer Type Thickness Copper Weight Customer Reference BoardsBoard Stack-up CRB Board Stackup Sheet 1Material ImpedanceCustomer Reference Boards CRB Board Stackup Sheet 2Board Outline Mechanical OutlineThis page intentionally left blank Design Guide Checklist PCI Express Interface SignalsSignals Recommendations Reason/Impact PERCOMP10Design Guide Checklist PCI/PCI-X Interface Signals Sheet 1PCI/PCI-X Interface Signals Sheet 2 Miscellaneous SignalsSMBus Interface Signals Recommendations Reason/ImpactReset Pins Ballout Pin Name UsagePower and Ground Signals Signal Recommendations Reason/ImpactJtag Signals This page intentionally left blank