Uart Signal Recommendations | Intel IXP43X specs

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

Image 28

Intel IXP43X manual Uart Signal Recommendations

Contents

Intel IXP43X Product Line of Network Processors Hardware Design Guidelines HDG Intel IXP43X Product Line of Network ProcessorsApril Contents Figures Tables Document Number 316844 Revision 001US Date Revision Description § §001 Initial release HDG Content Overview Chapter Name Description Related Documentation AcronymsList of Acronyms and Abbreviations Sheet 1 Term Explanation Overview List of Acronyms and Abbreviations Sheet 2 HDG Intel IXP435 Network Processor Block Diagram Typical Applications System Architecture Description System Memory Map Intel IXP43X Product Soft Fusible Features Signal Type DefinitionsSoft Fusible Features Sheet 1 Symbol Description Soft Fusible Features Sheet 2 USB Host Each USB can be Enable separatelyDDRII/I Sdram Interface Ethernet Signal Interface DDRII/I Sdram Interface Pin Description Sheet 1Type Name Device-Pin Connection Terminatio Description Field DDRII/I Sdram Initialization DDRII/I Sdram Interface Pin Description Sheet 2 Expansion Bus Expansion Bus Signal Recommendations Sheet 1Type Pull Name Recommendations Field Down Reset Configuration Straps Expansion Bus Signal Recommendations Sheet 2Boot/Reset Strapping Configuration Sheet 1 Name Type Pull Recommendations Field Down Boot/Reset Strapping Configuration Sheet 2 Setting Intel XScale Processor Operation Speed 3 8-Bit Device InterfaceIntel XScale Processor Cfg0 Cfg1 Cfgenn Actual Core Speed MHz 4 16-Bit Device Interface Flash Interface 16-Bit Device Interface Uart Interface Flash Interface Example Uart Signal Recommendations MII Interface Uart Interface Example MII NPE a Signal Recommendations Signal Interface MIIMII NPE C Signal Recommendations Sheet 1 MAC Management Signal Recommendations NPE a and NPE C MII NPE C Signal Recommendations Sheet 2Device Connection, MII Gpio Interface MII Interface Example USB Interface Gpio Signal RecommendationsDesign Notes USB Host Signal Recommendations Name Type Pull Description Field Down Common Mode Choke Host Device Utopia Level 2/MIIA Utopia Level 2 InterfaceType Pull Name Description Field Down UTPOPDATA4 UTPOPDATA75UTPOPADDR40 Utpopfci Clav UtpipfciUtpipsoc ETHARXDATA30 Etharxclk UTPIPDATA5 UTPIPDATA6UTPIPDATA7 UTPIPADDR40 HSS Interface Device Connection High-Speed, Serial Interface HSSTXDATA0HSSTXCLK0 HSSRXDATA0 SSP Interface HSS Interface Example Synchronous Serial Peripheral Port Interface PCI Interface Serial Flash and SSP Port SPI Interface Example PCI Controller Sheet 1 PCI Interface Block Diagram PCI Controller Sheet 2Pciintan Pciclkin Connect signal to same pin between PCI Parity Two devices PCI Option InterfacePCI Host/Option Interface Pin Description Sheet 1 Type Option Description Name Device-Pin Connection Field On the Option device, these signals are not Signal PCIREQN0 to one PCIREQN30 inputs to the HostPCI Host/Option Interface Pin Description Sheet 2 Type Option Name Device-Pin Connection Description Field Jtag Interface PCI Host/Option Interface Pin Description Sheet 3 Clock Signals Clock SignalsInput System Clock Clock Oscillator Recommendations for Crystal Selection Power Supply PowerNominal Name Voltage Description Power Sequence Reset TimingDecoupling Capacitance Recommendations VCC Decoupling § § Component Placement PCB OverviewGeneral Recommendations Component Selection Component Placement on a PCB Stack-Up Selection Controlled-impedance traces Low-impedance power distribution Layer Stackup General Layout and Routing Guide General Layout Guidelines Signal Changing Reference Planes General Component Spacing Good Design Practice for VIA Hole Placement Clock Signal Considerations Pad-to-Pad Clearance of Passive Components to a PGA or BGA USB V2.0 Considerations MII Signal ConsiderationsCrosstalk EMI Design Considerations Power and Ground PlaneTrace Impedance § § Electrical Interface Topology@33 MHz Tcyc = 30 nSec Tval = 11 nSec Tprop = 10 nSec PCI Address/Data Routing Guidelines Clock DistributionParameter Routing Guidelines Trace Length Limits PCI Clock Routing Guidelines Signal Loading Routing Guidelines Ddrii / Ddri Sdram Introduction DDRII/I Signal Groups Group Signal Name DescriptionDrasn / Ddrrasn Dcasn / Ddrcasn DDR Sdram Supported Ddri 32-bit Sdram Configurations Supported Ddrii 32-bit Sdram ConfigurationsSupported Ddri 16-bit Sdram Configurations Sizea Supported Ddrii 16-bit Sdram Configurations DDRII/DDRI Rcomp and Slew Resistances Pin RequirementsAddress Size Leaf Select Total Technology Arrangement Banks Ddrii OCD Pin Requirements DDR-II Symbol Parameter Units Min MaxDDR Clock Timings DDR Sdram Write Timings DDRII-400 MHz Interface -- Signal Timings Symbol Parameter Minimum Nominal Maximum Units DDR II/I Sdram Interface -- Signal Timings Symbol Parameter Minimum Nom Maximum UnitsTiming Relationships Printed Circuit Board Layer Stackup Group Signal Name Length mil Signal Package Lengths Sheet 1Timing Relationships Signal Package Lengths Sheet 2 Signal Package Lengths Sheet 3 Clock Group Data and Control Groups Parameter Definition Ddrii Data and Control Signal Group Routing Guidelines DCB70/DDRCB70, DDQ310 / DDRDQ310 Ddrii Command Signal Group Routing Guidelines Signal Group Members § §