100BASE-TX Receive Blocks, Transmit Driver | Intel 82555 manual

82555 — Networking Silicon

4.2.4Transmit Driver

The transmit differential lines are implemented with a digital slope controlled current driver that meets the TP-PMD specifications. Current is sunk from the isolation transformer by the transmit differential pins. The conceptual transmit differential waveform for 100 Mbps is illustrated in the following figure.

(V TDP -VTDN )
+1V
0V	t
-1V
ITDP
40mA
20mA
0	t
ITDN
40mA
20mA
0	t

Figure 7. Conceptual Transmit Differential Waveform

The magnetics module that is external to the 82555 converts ITDP and ITDN to 2.0 Vpp, as required by the TP-PMD specification. The same magnetics used for 100BASE-TX mode should also work

in 10BASE-T mode. The following is a list of current magnetics modules available from several vendors:

Table 3. Magnetics Modules

Vendor	Model/Type	100BASE-TX	10BASE-T


Delta	LF8200A	Yes	Yes

Pulse Engineering	PE-68515	Yes	Yes

Pulse Engineering	H1012	Yes	Yes

4.3100BASE-TX Receive Blocks

The receive subsection of the 82555 accepts 100BASE-TX MLT-3 data on the receive differential pair. Due to the advanced digital signal processing design techniques employed, the 82555 will accurately receive valid data from Category 5 (CAT5) UTP and Type 1 STP cable of length well in excess of 100 meters.

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Datasheet

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Intel 82555 manual 100BASE-TX Receive Blocks, Transmit Driver, Vendor Model/Type

Contents

Product Features 82555 10/100 Mbps LAN Physical Layer Interface Networking Silicon Revision Description Contents Repeater Mode Compliance to Industry Standards IntroductionFunctional Overview Networking Silicon 100 Mbps Mode Architectural Overview 10 Mbps Mode MII TX Interface Media Independent Interface MII Yes Transmit Error From RICRepeater mode only Pin Definitions Pin Numbers and Labels Clock Pins Twisted Pair Ethernet TPE PinsMedia Independent Interface MII Pins Pin Types Media Access Control/Repeater Interface Control Pins LED Pins External Bias Pins Miscellaneous 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 Blocks 2 100BASE-TX Scrambler and MLT-3 Encoder Invalid NRZ to MLT-3 Encoding Diagram 3 100BASE-TX Transmit Framing Vendor 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-Negotiation Adapter Mode Addresses Auto 10/100 Mbps Speed Selection Networking Silicon Datasheet 10BASE-T Functionality in Adapter Mode 10BASE-T Transmit Clock Generation10BASE-T Transmit Blocks 10BASE-T Receive Blocks 3 10BASE-T Error Detection and Reporting 10BASE-T Collision Detection10BASE-T Link Integrity 10BASE-T Jabber Control Function 10BASE-T Full Duplex Networking Silicon Datasheet Connectivity Repeater ModeSpecial Repeater Features Clock Signal Example Management Data Interface MDI Frame Structure Bits Name Description Default MDI RegistersMDI Registers 0 Transition Register 1 Status Register Bit Definitions 10BASE-T Register 2 82555 Identifier Register Bit Definitions MDI Registers 8 MDI Registers 16 Register 17 82555 Special Control Bit Definitions 100BASE-TX 150 Register 22 Receive Symbol Error Counter Bit Definitions Actled Liled Bit Setting Technology Auto-Negotiation FunctionalityDescription Priority Technology Parallel Detect and Auto-Negotiation Priority Auto-Negotiation and Parallel Detect Networking Silicon Datasheet LED Descriptions Networking Silicon Datasheet Reset and Miscellaneous Test Modes ResetLoopback Scrambler Bypass Test Instruction Coding Number Code Test Instruction Select Input to Tout Electrical Specifications and Timing Parameters DC CharacteristicsAbsolute Maximum Ratings General Operating Conditions 11.3.3 100BASE-TX Voltage/Current DC Characteristics Total supply current 230 Leakage on analog pins Symbol Parameter Conditions Min Typ Max Units AC CharacteristicsMII Clock Specifications MII Timing Parameters MII Clocks AC Timing Repeater Mode Timing Parameters RXC tri-stated a Transmit Packet Timing Parameters Squelch Test Timing Parameters Jabber Timing Parameters Receive Packet Timing Parameters 11.4.8 10BASE-T Normal Link Pulse NLP Timing Parameters Auto-Negotiation Fast Link Pulse FLP Timing Parameters Reset Timing Parameters 11.4.11 X1 Clock Specifications 11.4.12 100BASE-TX Transmitter AC Specification X1 Clock Specifications Symbol Description Min Norm Max 12.0 82555 Package Information 10.0