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
2016 Microchip Technology Inc. DS00002165B-page 47
LAN8720A/LAN8720AI
4.2.7 AUTO NEGOTIATION EXPANSION REGISTER
Index (In Decimal): 6 Size: 16 bits
Bits Description Type Default
15:5 RESERVED RO —
4 Parallel Detection Fault
0 = no fault detected by parallel detection logic
1 = fault detected by parallel detection logic
RO/LH 0b
3 Link Partner Next Page Able
0 = link partner does not have next page ability
1 = link partner has next page ability
RO 0b
2 Next Page Able
0 = local device does not have next page ability
1 = local device has next page ability
RO 0b
1 Page Received
0 = new page not yet received
1 = new page received
RO/LH 0b
0 Link Partner Auto-Negotiation Able
0 = link partner does not have auto-negotiation ability
1 = link partner has auto-negotiation ability
RO 0b
4.2.8 MODE CONTROL/STATUS REGISTER
Index (In Decimal): 17 Size: 16 bits
Bits Description Type Default
15:14 RESERVED RO —
13 EDPWRDOWN
Enable the Energy Detect Power-Down mode:
0 = Energy Detect Power-Down is disabled
1 = Energy Detect Power-Down is enabled
R/W 0b
12:10 RESERVED RO —
9 FARLOOPBACK
Enables far loopback mode (for example, all the received packets are sent
back
simultaneously (in 100BASE-TX only)). This mode works even if the Iso-
late bit (0.10) is set.
0 = Far loopback mode is disabled
1 = Far loopback mode is enabled
Refer to Section 3.8.9.2, Far Loopback for additional information.
R/W 0b