Intel 82555 9.0 LED Descriptions

Datasheet 39

Networking Silicon — 82555

9.0 LED Descriptions

The 82555 supports four LED pins to indicate link status, network activity and network speed.

•Link: This LED is off (logic high) until a valid link has been detected. After a valid link has

been detected, the LED will remain on (active-low).

•Activity: This LED is on (active-low) when activity is detected on the wire. In DTE (adapter)

mode, this LED is on during transmit and receive when the 82555 is not in loopback mode. In

repeater mode, this LED is on only during receive when the 82555 is not in loopback mode.

•Speed: This LED will be on if a 100BASE-TX link is detected and off if a 10BASE-T link is

detected. If the link fails while in Auto-Negotiation, this LED will keep the last valid link state.

If 100BASE-TX link is forced this LED will be on, regardless of the link status. This LED will

be of if the 10BASE-T link is forced, regardless of the link status.

•Full Duplex: The FDX_N signal can operate as a LED if it is enabled. It indicates full duplex

link for either 100BASE-TX or 10 BASE-T technology.

MDI register 27 in Section 7.2.3.9, “Register 27: 82555 Special Control Bit Definitions” on

page 34 details the information for LED function mapping and support enhancements.

Contents

Main 82555 10/100 Mbps LAN Physical Layer Interface Networking Silicon Datasheet Product Features Page Page Contents 1.0 Introduction 1.1 Functional Overview 1.2 Compliance to Industry Standards Page 2.0 Architectural Overview 2.1 100 Mbps Mode 2.2 10 Mbps Mode Magnetics Module Datasheet 5 g Figure 4. Intel 82557/82555 Solution 2.3 Media Independent Interface (MII) 82555 82557 PCI Bus Si nals Page Page 8 Datasheet 3.1 Pin Types 3.2 Clock Pins 3.4 Media Independent Interface (MII) Pins 3.3 Twisted Pair Ethernet (TPE) Pins 3.5 Media Access Control/Repeater Interface Control Pins Datasheet 9 10 Datasheet 3.6 LED Pins 3.7 External Bias Pins Datasheet 11 3.8 Miscellaneous Control Pins 3.9 Power and Ground Pins 4.0 100BASE-TX Adapter Mode Operation 4.1 100BASE-TX Transmit Clock Generation 4.2 100BASE-TX Transmit Blocks 4.2.1 100BASE-TX 4B/5B Encoder 4.2.2 100BASE-TX Scrambler and MLT-3 Encoder Page 4.2.4 Transmit Driver 4.3 100BASE-TX Receive Blocks 4.4 100BASE-TX Collision Detection 4.5 100BASE-TX Link Integrity and Auto-Negotiation Solution 4.5.1 Link Integrity 4.5.2 Auto-Negotiation 4.5.3 Combination Tx/T4 Auto-Negotiation Solution 4.6 Auto 10/100 Mbps Speed Selection 4.7 Adapter Mode Addresses Page 5.0 10BASE-T Functionality in Adapter Mode 5.1 10BASE-T Transmit Clock Generation 5.2 10BASE-T Transmit Blocks 5.2.1 10BASE-T Manchester Encoder 5.2.2 10BASE-T Driver and Filter 5.4 10BASE-T Collision Detection 5.5 10BASE-T Link Integrity 5.6 10BASE-T Jabber Control Function Page Page 6.0 Repeater Mode 6.1 Special Repeater Features 6.2 Connectivity Page 7.0 Management Data Interface 7.1 MDI Frame Structure 7.2 MDI Registers 7.2.1 MDI Registers 0 - 7 7.2.1.1 Register 0: Control Register Bit Definitions 7.2.1.2 Register 1: Status Register Bit Definitions Datasheet 29 30 Datasheet Datasheet 31 7.2.1.6 Register 5: Auto-Negotiation Link Partner Ability Register Bit Definitions Register numbers 16, 17, 20, 21, 22, 23, 24, 25, and 27 are described in the following subsections. 7.2.1.7 Register 6: Auto-Negotiation Expansion Register Bit Definitions 7.2.2 MDI Registers 8 - 15 Registers eight through fifteen are reserved for IEEE. 7.2.3 MDI Registers 16 - 31 32 Datasheet 7.2.3.1 Register 16: 82555 Status and Control Register Bit Definitions 7.2.3.2 Register 17: 82555 Special Control Bit Definitions Datasheet 33 7.2.3.3 Register 20: 100BASE-TX Receive Disconnect Counter Bit Definitions 7.2.3.4 Register 21: 100BASE-TX Receive Error Frame Counter Bit Definitions 34 Datasheet 7.2.3.5 Register 22: Receive Symbol Error Counter Bit Definitions 7.2.3.6 Register 23: 100BASE-TX Receive Premature End of Frame Error Counter Bit Definitions 7.2.3.9 Register 27: 82555 Special Control Bit Definitions 7.2.3.7 Register 24: 10BASE-T Receive End of Frame Error Counter Bit Definitions 7.2.3.8 Register 25: 10BASE-T Transmit Jabber Detect Counter Bit Definitions 8.0 Auto-Negotiation Functionality 8.1 Description 8.2 Parallel Detect and Auto-Negotiation Page Page 9.0 LED Descriptions Page 10.0 Reset and Miscellaneous Test Modes 10.1 Reset 10.2 Loopback 10.3 Scrambler Bypass 10.4 Test Port Page Datasheet 43 11.0 Electrical Specifications and Timing Parameters 11.1 Absolute Maximum Ratings 11.3.2 10BASE-T Voltage/Current DC Characteristics 11.2 General Operating Conditions 11.3 DC Characteristics 11.3.1 MII DC Characteristics Icct10 105mA 110mA 115mA Figure 11. RBIAS10 Resistance versus I 44 Datasheet 768 Icct100 38mA 40mA 42mA 604 634 Figure 12. RBIAS100 Resistance versus I 11.4.2 MII Timing Parameters T1,T2,T3 Figure 15. MII Transmit Timing Parameters Figure 14. MII Clocks AC Timing 46 Datasheet 11.4.3 Repeater Mode Timing Parameters Datasheet 47 Figure 16. MII Receive Timing Parameters Figure 18. PORT Enable Timing Figure 17. MII Timing Parameters: MDC/MDIO 11.4.4 Transmit Packet Timing Parameters Figure 19. Transmit Frame Timing Parameters 11.4.5 Squelch Test Timing Parameters Datasheet 49 Figure 20. Squelch Test Timing Parameters 11.4.6 Jabber Timing Parameters 11.4.7 Receive Packet Timing Parameters 50 Datasheet Figure 22. Receive Packet Timing Parameters 11.4.8 10BASE-T Normal Link Pulse (NLP) Timing Parameters 11.4.9 Auto-Negotiation Fast Link Pulse (FLP) Timing Parameters Figure 23. Normal Link Pulse Timing Parameters Datasheet 51 Networking Silicon 82555 11.4.10 Reset Timing Parameters 11.4.11 X1 Clock Specifications 11.4.12 100BASE-TX Transmitter AC Specification 12.0 82555 Package Information