AC Characteristics, MII Clock Specifications | Intel 82555 guide

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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Image 49

Intel 82555 manual AC Characteristics, MII Clock Specifications, Symbol Parameter Conditions Min Typ Max Units

Contents

82555 10/100 Mbps LAN Physical Layer Interface Product Features Revision Description Networking Silicon Contents Repeater Mode Functional Overview IntroductionCompliance to Industry Standards Networking Silicon Architectural Overview 100 Mbps Mode MII TX Interface 10 Mbps Mode Media Independent Interface MII Repeater mode only Transmit Error From RICYes Pin Numbers and Labels Pin Definitions Twisted Pair Ethernet TPE Pins Clock PinsMedia Independent Interface MII Pins Pin Types Media Access Control/Repeater Interface Control Pins External Bias Pins LED Pins Miscellaneous 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 Blocks Invalid 2 100BASE-TX Scrambler and MLT-3 Encoder 3 100BASE-TX Transmit Framing NRZ to MLT-3 Encoding Diagram Transmit 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-Negotiation Auto 10/100 Mbps Speed Selection Adapter Mode Addresses Networking Silicon Datasheet 10BASE-T Transmit Clock Generation 10BASE-T Functionality in Adapter Mode10BASE-T Transmit Blocks 10BASE-T Receive Blocks 10BASE-T Collision Detection 3 10BASE-T Error Detection and Reporting10BASE-T Link Integrity 10BASE-T Jabber Control Function 10BASE-T Full Duplex Networking Silicon Datasheet Special Repeater Features Repeater ModeConnectivity Clock Signal Example MDI Frame Structure Management Data Interface MDI Registers Bits Name Description DefaultMDI Registers 0 Transition 10BASE-T Register 1 Status Register Bit Definitions Register 2 82555 Identifier Register Bit Definitions MDI Registers 16 MDI Registers 8 100BASE-TX Register 17 82555 Special Control Bit Definitions 150 Actled Liled Register 22 Receive Symbol Error Counter Bit Definitions Auto-Negotiation Functionality Bit Setting TechnologyDescription Priority Technology Priority Parallel Detect and Auto-Negotiation Auto-Negotiation and Parallel Detect Networking Silicon Datasheet LED Descriptions Networking Silicon Datasheet Reset Reset and Miscellaneous Test ModesLoopback Scrambler Bypass Number Code Test Instruction Select Input to Tout Test Instruction Coding DC Characteristics Electrical Specifications and Timing ParametersAbsolute Maximum Ratings General Operating Conditions Total supply current 230 Leakage on analog pins 11.3.3 100BASE-TX Voltage/Current DC Characteristics MII Clock Specifications AC CharacteristicsSymbol Parameter Conditions Min Typ Max Units MII Clocks AC Timing MII Timing Parameters RXC tri-stated a Repeater Mode Timing Parameters Squelch Test Timing Parameters Transmit Packet Timing Parameters Receive Packet Timing Parameters Jabber Timing Parameters Auto-Negotiation Fast Link Pulse FLP Timing Parameters 11.4.8 10BASE-T Normal Link Pulse NLP Timing Parameters 11.4.11 X1 Clock Specifications Reset Timing Parameters X1 Clock Specifications 11.4.12 100BASE-TX Transmitter AC Specification 12.0 82555 Package Information Symbol Description Min Norm Max 10.0