Intel 82555 manual AC Characteristics, MII Clock Specifications

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Networking Silicon — 82555

Symbol	Parameter Description	Condition	Min	Typ	Max	Units


c	Current on all VCC pins			235		mA
ICC100	Current on all VCC pins			235		mA
ICCT100TOT	Total supply current			275		mA

a.Transmitter current is measured with a 1:1 transformer on the center tap.

b.Transmitter current is measured with a 1:1 transformer on the center tap.

c.Current is measured on all VCC pins at VCC = 5.25 V.

Rbias100

6 6 7 Ω

6 3 4 Ω

3 8 m A	4 0 m A	4 2 m A Icct100
6 0 4 Ω

Figure 12. RBIAS100 Resistance versus ICCT100

11.4AC Characteristics

Output Levels

Input Levels

VOH = 2.4 V

VIH = 2.0 V

VOL = 0.45 V

VIL = 0.8 V

Figure 13. AC Testing Level Conditions

11.4.1MII Clock Specifications

	Symbol	Parameter	Conditions	Min	Typ	Max	Units


T1	TP100	TXC/RXC period	100 Mbps		40		ns
T2	TP10	TXC/RXC period	10 Mbps		400		ns
T3	TPMDC	MDC clock period		400			ns
T4	TTXDC	TXC duty cycle		35		65	%
T5	TRXDC	RXC duty cycle		35		65	%
T6	TMDC	MDC duty cycle		35		65	%

Datasheet

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Contents 82555 10/100 Mbps LAN Physical Layer Interface Product FeaturesRevision Description Networking SiliconContents Repeater Mode Functional Overview IntroductionCompliance to Industry Standards Networking Silicon Architectural Overview 100 Mbps ModeMII TX Interface 10 Mbps ModeMedia Independent Interface MII Repeater mode only Transmit Error From RICYes Pin Numbers and Labels Pin DefinitionsTwisted Pair Ethernet TPE Pins Clock PinsMedia Independent Interface MII Pins Pin TypesMedia Access Control/Repeater Interface Control Pins External Bias Pins LED PinsMiscellaneous Control Pins VCC Power and Ground PinsVSS Symbol 5B Symbol Code 4B Nibble Code 100BASE-TX Adapter Mode Operation100BASE-TX Transmit Clock Generation 100BASE-TX Transmit BlocksInvalid 2 100BASE-TX Scrambler and MLT-3 Encoder3 100BASE-TX Transmit Framing NRZ to MLT-3 Encoding DiagramTransmit Driver 100BASE-TX Receive BlocksVendor Model/Type 100BASE-TX Collision Detection Combination Tx/T4 Auto-Negotiation Solution 100BASE-TX Link Integrity and Auto-Negotiation SolutionLink Integrity Auto-NegotiationAuto 10/100 Mbps Speed Selection Adapter Mode AddressesNetworking Silicon Datasheet 10BASE-T Transmit Clock Generation 10BASE-T Functionality in Adapter Mode10BASE-T Transmit Blocks 10BASE-T Receive Blocks10BASE-T Collision Detection 3 10BASE-T Error Detection and Reporting10BASE-T Link Integrity 10BASE-T Jabber Control Function10BASE-T Full Duplex Networking Silicon Datasheet Special Repeater Features Repeater ModeConnectivity Clock Signal Example MDI Frame Structure Management Data InterfaceMDI Registers Bits Name Description DefaultMDI Registers 0 Transition10BASE-T Register 1 Status Register Bit DefinitionsRegister 2 82555 Identifier Register Bit Definitions MDI Registers 16 MDI Registers 8100BASE-TX Register 17 82555 Special Control Bit Definitions150 Actled Liled Register 22 Receive Symbol Error Counter Bit DefinitionsAuto-Negotiation Functionality Bit Setting TechnologyDescription Priority TechnologyPriority Parallel Detect and Auto-NegotiationAuto-Negotiation and Parallel Detect Networking Silicon Datasheet LED Descriptions Networking Silicon Datasheet Reset Reset and Miscellaneous Test ModesLoopback Scrambler BypassNumber Code Test Instruction Select Input to Tout Test Instruction CodingDC Characteristics Electrical Specifications and Timing ParametersAbsolute Maximum Ratings General Operating ConditionsTotal supply current 230 Leakage on analog pins 11.3.3 100BASE-TX Voltage/Current DC CharacteristicsMII Clock Specifications AC CharacteristicsSymbol Parameter Conditions Min Typ Max Units MII Clocks AC Timing MII Timing ParametersRXC tri-stated a Repeater Mode Timing ParametersSquelch Test Timing Parameters Transmit Packet Timing ParametersReceive Packet Timing Parameters Jabber Timing ParametersAuto-Negotiation Fast Link Pulse FLP Timing Parameters 11.4.8 10BASE-T Normal Link Pulse NLP Timing Parameters11.4.11 X1 Clock Specifications Reset Timing ParametersX1 Clock Specifications 11.4.12 100BASE-TX Transmitter AC Specification12.0 82555 Package Information Symbol Description Min Norm Max10.0