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Intel IXP43X manual Signal Interface, UART Signal Recommendations

Models: IXP43X

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Intel® IXP43X Product Line of Network Processors—Hardware Design Guidelines

• Clear to Send

Note: The UART module does not support full modem functionality. However, this can be implemented, by using GPIO ports to generate DTR, DSR, RI, and DCD and making some changes to the driver.

3.4.1Signal Interface

Table 8.		UART Signal Recommendations

		Type	Pull
	Name	Type	Up/	Recommendations
	Name	Field	Up/	Recommendations
		Field	Down
			Down

				Serial data input Port 0.
	RXDATA0	I	Yes	Ω
				When signal is not being used in the system, this pin should be pulled high with a 10-K
				resistor.

	TXDATA0	O	No	Serial data output Port 0.

				Clear-To-Send Port 0.
	CTS0_N	I	Yes	\When signal is not being used in the system, this pin should be pulled high with a 10-KΩ
				resistor.

	RTS0_N	O	No	Request-To-Send Port 0.

The following figure contain a typical four signal interface between the UART and an RS-232 transceiver driver, required to interface with external devices. Unused inputs to the RS-232 driver can be connected to ground. This avoids signals floating to undetermined states which can cause over heating of the driver leading to permanent damage.

Intel® IXP43X Product Line of Network Processors
HDG	April 2007
28	Document Number: 316844; Revision: 001US

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Intel IXP43X manual Signal Interface, UART Signal Recommendations

Contents

Intel IXP43X Product Line of Network Processors Hardware Design GuidelinesApril Intel IXP43X Product Line of Network Processors AprilContents IntroductionFigures Tables DDRII Data and Control Simulation Results DQ and DQS signalsMAC Management Signal Recommendations NPE A and NPE C Pad-to-Pad Clearance of Passive Components to a PGA or BGADDR Clock Timings Revision History AprilApril Intel IXP43X Product Line of Network ProcessorsDocument Number 316844 Revision 001US 1.1 Content Overview 1.0 Introduction1.2 Related Documentation 1.3 AcronymsIntel IXP43X Product Line of Network Processors Datasheet Intel IXP400 Software Specification Update1.4 Overview Table 1. List of Acronyms and Abbreviations Sheet 2 of16 GPIO General Purpose Input Output Packaging 460-pin PBGA Figure 1. Intel IXP435 Network Processor Block Diagram 1.5 Typical Applications 2.1 System Architecture Description 2.0 System Architecture2.2 System Memory Map JTAG HeaderProcessors Memory Bus3.1 Soft Fusible Features 3.0 General Hardware Design ConsiderationsTable 2. Signal Type Definitions Soft Fusible Features Sheet 1 of3.2 DDRII/I SDRAM Interface Soft Fusible Features Sheet 2 of3.2.1 Signal Interface DDRII/I SDRAM Interface Pin Description Sheet 1 of3.2.2 DDRII/I SDRAM Initialization DDRII/I SDRAM Interface Pin Description Sheet 2 of3.3 Expansion Bus 3.3.1 Signal InterfaceExpansion Bus Signal Recommendations Sheet 1 of Expansion Bus Signal Recommendations Sheet 2 of 3.3.2 Reset Configuration StrapsBoot/Reset Strapping Configuration Sheet 1 of Boot/Reset Strapping Configuration Sheet 2 of Network Processors Developer’s Manual3.3.3 8-Bit Device Interface Setting Intel XScale Processor Operation SpeedApril 3.3.4 16-Bit Device InterfaceDocument Number 316844 Revision 001US Byte Access 16-Bit-Word AccessIntel IXP43X Product Line of NetworkIntel Flash 3.4 UART Interface16-Bit-Word Access 16-Bit Device3.4.1 Signal Interface UART Signal RecommendationsConnector Female 1 DCD2 RX 3 TX3.5.1 Signal Interface MII MII NPE A Signal RecommendationsMII NPE C Signal Recommendations Sheet 1 of being disabled without asserting a system reset3.5.2 Device Connection, MII MII NPE C Signal Recommendations Sheet 2 ofMAC Management Signal Recommendations - NPE A and NPE C being disabled without asserting a system reset3.6 GPIO Interface Network Processors10/100 Intel IXP43X3.6.1 Signal Interface 3.7 USB Interface3.6.2 Design Notes GPIO Signal Recommendations3.7.1 Signal Interface USB Host Signal RecommendationsFigure 7. Common Mode Choke USB RBIASP USB RBIASN22.6 Ω ±1 % resistor3.8 UTOPIA Level 2 Interface 3.8.1 Signal InterfaceUTOPIA Level 2/MIIA Type PullName DescriptionType PullName DescriptionType PullName Description3.9 HSS Interface 3.8.2 Device ConnectionIntel IXP43X Product Line of3.9.1 Signal Interface 3.9.2 Device Connectionbeing disabled without asserting a system reset High-Speed, Serial Interface3.10 SSP Interface Figure 11. HSS Interface Example3.10.2 Device Connection 3.10.1 Signal InterfaceSynchronous Serial Peripheral Port Interface 3.11 PCI Interface Intel IXP43X ProductLine of Network Processors3.11.1 Signal Interface PCI Controller Sheet 1 of3.11.2 PCI Interface Block Diagram PCI Controller Sheet 2 of3.11.3 PCI Option Interface Network ProcessorsFigure 13. PCI Interface Table 18. PCI Host/Option Interface Pin Description Sheet 1 ofPCI Host/Option Interface Pin Description Sheet 2 of TypeOption Name3.11.4 Design Notes 3.12 JTAG InterfacePCI Host/Option Interface Pin Description Sheet 3 of 3.12.1 Signal Interface 3.13.1 Clock Signals3.13 Input System Clock 3.13.2 Clock OscillatorNetwork 3.13.3 Recommendations for Crystal SelectionOSCIN 33 KΩ3.14 Power Power SupplyProcessors Datasheet Processors Datasheet3.14.5 Power Sequence 3.14.6 Reset Timing3.14.1 Decoupling Capacitance Recommendations 3.14.2 VCC DecouplingThe IXP43X network processors can be configured at reset de-assertion via external, pull-down resistors on the address expansion bus signals EXADDR2321. For a complete description, see Section 6, “Boot/Reset Strapping Configuration” on page 4.4 Component Placement 4.0 General PCB Guide4.1 PCB Overview 4.2 General Recommendations4.5 Stack-Up Selection InexpensiveManufactured by virtually all printed-circuit-board vendors Figure 16. Component Placement on a PCBPoor routing density Uncontrolled signal trace impedance Lack of power/ground planes, resulting in unacceptable crosstalkControlled-impedance traces Low-impedance power distribution Higher cost More weight Manufactured by fewer vendorsFigure 17. 8-Layer Stackup Figure 18. 6-Layer Stackup5.1 Overview 5.0 General Layout and Routing Guide5.2 General Layout Guidelines 5.2.1 General Component Spacing VIAsFigure 19. Signal Changing Reference Planes Figure 20. Good Design Practice for VIA Hole Placement Figure 21. Poor Design Practice for VIA Placement25 mils min 25 mils min 25 mils min Flush Via min Potential Bridge minPBGA Package 5.2.2 Clock Signal ConsiderationsFigure 22. Pad-to-Pad Clearance of Passive Components to a PGA or BGA 5.2.4 USB V2.0 Considerations 5.2.3 MII Signal Considerations5.2.5 Crosstalk 5.2.6 EMI Design Considerations 5.2.8 Power and Ground Plane5.2.7 Trace Impedance Use at least one decoupling capacitor per power pin and place it as close as possible to the pin 6.1 Electrical Interface 6.0 PCI Interface Design Considerations6.2 Topology 6.3 Clock Distribution PCI SlotPCI Slot PCI Slot6.3.1 Trace Length Limits PCI DevicesClock Driver6.3.2 Routing Guidelines 6.3.3 Signal LoadingThis manual does not repeat all the guidelines that are already stated in the 7.0 DDRII / DDRI SDRAM 7.1 IntroductionDDRII/I Signal Groups Signal NameGroup DescriptionDDR SDRAM ProcessorsProduct Line of Network IXP43XSupported DDRII 32-bit SDRAM Configurations Supported DDRI 32-bit SDRAM ConfigurationsSupported DDRI 16-bit SDRAM Configurations DDRI R1 =387 Ω ±1 % resistorR 1 = 285 Ω ±1 % resistor DDRIMPCRES7.3 DDRII OCD Pin Requirements 7.3.1 Signal-Timing AnalysisFigure 27. DDRII OCD Pin Requirements Figure 28. DDR Clock Timing WaveformFigure 29. DDR SDRAM Write Timings Figure 30. DDR SDRAM Read TimingsADDR/CTRL CS10# CK DQS DQS # DQFigure 31. DDR - Write Preamble/Postamble Duration DDRII-400 MHz Interface -- Signal TimingsSee Figure 29, “DDR SDRAM Write Timings” on page DDR II/I SDRAM Interface -- Signal Timings 7.3.2 Timing Relationships7.3.1.0.1 Printed Circuit Board Layer Stackup Signal Package Lengths Sheet 1 of Table 31 on pageTable 32 on page Table 33 on page Figure 30 on page Table 32 on pageSignal Package Lengths Sheet 2 of Signal NameSignal Name Group7.3.3.1 Clock Group 7.3.3 Routing GuidelinesSignal Package Lengths Sheet 3 of Figure 32. DDRII Clock Simulation Results CK Signals 7.3.3.2 Data and Control GroupsClock Signal Group Routing Guidelines 22 ohm Table 35. DDRII Data and Control Signal Group Routing Guidelines7.3.3.3 Command Groups 20ohmTable 35. DDRII Data and Control Signal Group Routing Guidelines Figure 34. DDRII Command Simulation Results ADDRESS signalsTable 36. DDRII Command Signal Group Routing Guidelines