Intel 82555 manual Mbps Mode, MII TX Interface

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82555 — Networking Silicon

•Receive: The 82555 takes receive analog MLT-3 data from the receive differential pair and converts it into a digital 125 Mbps stream, recovering both clock and data signals.

MII TX Interface							MII RX Interface
4b/5b							4b/5b
Encoding							4b/5b
Encoding							Decoding
							Decoding
Scrambler							De-scrambler
							De-scrambler
Serialization							Serial to 5B
							Serial to 5B
NRZ to NRZI							NRZI to NRZ
							NRZI to NRZ
NRZI to MLT3							MLT3 to NRZI
							MLT3 to NRZI
	Magnetics Module
1	2	3	4	5	6	7	8
		RJ-45 Connector

Figure 3. 82555 Analog Logic

2.210 Mbps Mode

The 82555 operation in 10BASE-T mode is similar to the 82555 operation in 100BASE-TX mode. Manchester encoding and decoding is used instead of 4B/5B encoding/decoding and scrambling/ descrambling. In addition, the Transmit Clock and Receive Clock (MII clock signals) provide 2.5 MHz instead of 25 MHz.

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Datasheet

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Contents Product Features 82555 10/100 Mbps LAN Physical Layer InterfaceNetworking Silicon Revision DescriptionContents Repeater Mode Compliance to Industry Standards IntroductionFunctional Overview Networking Silicon 100 Mbps Mode Architectural Overview10 Mbps Mode MII TX InterfaceMedia Independent Interface MII Yes Transmit Error From RICRepeater mode only Pin Definitions Pin Numbers and LabelsClock Pins Twisted Pair Ethernet TPE PinsMedia Independent Interface MII Pins Pin TypesMedia Access Control/Repeater Interface Control Pins LED Pins External Bias PinsMiscellaneous Control Pins VSS Power and Ground PinsVCC 100BASE-TX Adapter Mode Operation Symbol 5B Symbol Code 4B Nibble Code100BASE-TX Transmit Clock Generation 100BASE-TX Transmit Blocks2 100BASE-TX Scrambler and MLT-3 Encoder InvalidNRZ to MLT-3 Encoding Diagram 3 100BASE-TX Transmit FramingVendor Model/Type 100BASE-TX Receive BlocksTransmit Driver 100BASE-TX Collision Detection 100BASE-TX Link Integrity and Auto-Negotiation Solution Combination Tx/T4 Auto-Negotiation SolutionLink Integrity Auto-NegotiationAdapter Mode Addresses Auto 10/100 Mbps Speed SelectionNetworking Silicon Datasheet 10BASE-T Functionality in Adapter Mode 10BASE-T Transmit Clock Generation10BASE-T Transmit Blocks 10BASE-T Receive Blocks3 10BASE-T Error Detection and Reporting 10BASE-T Collision Detection10BASE-T Link Integrity 10BASE-T Jabber Control Function10BASE-T Full Duplex Networking Silicon Datasheet Connectivity Repeater ModeSpecial Repeater Features Clock Signal Example Management Data Interface MDI Frame StructureBits Name Description Default MDI RegistersMDI Registers 0 TransitionRegister 1 Status Register Bit Definitions 10BASE-TRegister 2 82555 Identifier Register Bit Definitions MDI Registers 8 MDI Registers 16Register 17 82555 Special Control Bit Definitions 100BASE-TX150 Register 22 Receive Symbol Error Counter Bit Definitions Actled LiledBit Setting Technology Auto-Negotiation FunctionalityDescription Priority TechnologyParallel Detect and Auto-Negotiation PriorityAuto-Negotiation and Parallel Detect Networking Silicon Datasheet LED Descriptions Networking Silicon Datasheet Reset and Miscellaneous Test Modes ResetLoopback Scrambler BypassTest Instruction Coding Number Code Test Instruction Select Input to ToutElectrical Specifications and Timing Parameters DC CharacteristicsAbsolute Maximum Ratings General Operating Conditions11.3.3 100BASE-TX Voltage/Current DC Characteristics Total supply current 230 Leakage on analog pinsSymbol Parameter Conditions Min Typ Max Units AC CharacteristicsMII Clock Specifications MII Timing Parameters MII Clocks AC TimingRepeater Mode Timing Parameters RXC tri-stated aTransmit Packet Timing Parameters Squelch Test Timing ParametersJabber Timing Parameters Receive Packet Timing Parameters11.4.8 10BASE-T Normal Link Pulse NLP Timing Parameters Auto-Negotiation Fast Link Pulse FLP Timing ParametersReset Timing Parameters 11.4.11 X1 Clock Specifications11.4.12 100BASE-TX Transmitter AC Specification X1 Clock SpecificationsSymbol Description Min Norm Max 12.0 82555 Package Information10.0