Datasheet
Table Of Contents
- Small Footprint RMII 10/100 Ethernet Transceiver with HP Auto-MDIX Support
- 1.0 Introduction
- 2.0 Pin Description and Configuration
- 3.0 Functional Description
- 3.1 Transceiver
- 3.2 Auto-negotiation
- 3.3 HP Auto-MDIX Support
- 3.4 MAC Interface
- 3.5 Serial Management Interface (SMI)
- 3.6 Interrupt Management
- 3.7 Configuration Straps
- 3.8 Miscellaneous Functions
- 3.9 Application Diagrams
- 4.0 Register Descriptions
- 4.1 Register Nomenclature
- 4.2 Control and Status Registers
- TABLE 4-2: SMI Register Map
- 4.2.1 Basic Control Register
- 4.2.2 Basic Status Register
- 4.2.3 PHY Identifier 1 Register
- 4.2.4 PHY Identifier 2 Register
- 4.2.5 Auto Negotiation Advertisement Register
- 4.2.6 Auto Negotiation Link Partner Ability Register
- 4.2.7 Auto Negotiation Expansion Register
- 4.2.8 Mode Control/Status Register
- 4.2.9 Special Modes Register
- 4.2.10 Symbol Error Counter Register
- 4.2.11 Special Control/Status Indications Register
- 4.2.12 Interrupt Source Flag Register
- 4.2.13 Interrupt Mask Register
- 4.2.14 PHY Special Control/Status Register
- 5.0 Operational Characteristics
- 6.0 Package Information
- 7.0 Application Notes
- Appendix A: Data Sheet Revision History
- The Microchip Web Site
- Customer Change Notification Service
- Customer Support
- Product Identification System
- Worldwide Sales and Service
LAN8720A/LAN8720AI
DS00002165B-page 44 2016 Microchip Technology Inc.
4.2.3 PHY IDENTIFIER 1 REGISTER
Index (In Decimal): 2 Size: 16 bits
Bits Description Type Default
15:0 PHY ID Number
Assigned to the 3rd through 18th bits of the Organizationally Unique Identifier
(O
UI), respectively.
R/W 0007h
4.2.4 PHY IDENTIFIER 2 REGISTER
Index (In Decimal): 3 Size: 16 bits
9 100BASE-T2 Half Duplex
0 = PHY not able to perform half duplex 100BASE-T2
1 = PHY able to perform half duplex 100BASE-T2
RO 0b
8 Extended Status
0 = no extended status information in register 15
1 = extended status information in register 15
RO 0b
7:6 RESERVED RO —
5 Auto-Negotiate Complete
0 = auto-negotiate process not completed
1 = auto-negotiate process completed
RO 0b
4 Remote Fault
1 = remote fault condition detected
0 = no remote fault
RO/LH 0b
3 Auto-Negotiate Ability
0 = unable to perform auto-negotiation function
1 = able to perform auto-negotiation function
RO 1b
2 Link Status
0 = link is down
1 = link is up
RO/LL 0b
1 Jabber Detect
0 = no jabber condition detected
1 = jabber condition detected
RO/LH 0b
0 Extended Capabilities
0 = does not support extended capabilities registers
1 = supports extended capabilities registers
RO 1b
Bits Description Type Default