Datasheet
Table Of Contents
- 1.0 Introduction
- 2.0 Pin Description and Configuration
- 3.0 Functional Description
- 3.1 10BASE-T/100BASE-TX Transceiver
- 3.2 RMII Interface
- 3.3 Back-to-Back Mode – 100 Mbps Copper Repeater
- 3.4 MII Management (MIIM) Interface
- 3.5 Interrupt (INTRP)
- 3.6 HP Auto MDI/MDI-X
- 3.7 Loopback Mode
- 3.8 LinkMD® Cable Diagnostic
- 3.9 NAND Tree Support
- 3.10 Power Management
- 3.11 Reference Circuit for Power and Ground Connections
- 3.12 Typical Current/Power Consumption
- 4.0 Register Descriptions
- 5.0 Operational Characteristics
- 6.0 Electrical Characteristics
- 7.0 Timing Diagrams
- 8.0 Reset Circuit
- 9.0 Reference Circuits — LED Strap-In Pins
- 10.0 Reference Clock - Connection and Selection
- 11.0 Magnetic - Connection and Selection
- 12.0 Package Outline
KSZ8081RNA/RND
DS00002199A-page 26 2016 Microchip Technology Inc.
4.0 REGISTER DESCRIPTIONS
This chapter describes the various control and status registers (CSRs).
4.1 Register Map
4.2 Register Descriptions
TABLE 4-1: REGISTERS SUPPORTED BY KSZ8081RNA/RND
Register Number (hex) Description
0h Basic Control
1h Basic Status
2h PHY Identifier 1
3h PHY Identifier 2
4h Auto-Negotiation Advertisement
5h Auto-Negotiation Link Partner Ability
6h Auto-Negotiation Expansion
7h Auto-Negotiation Next Page
8h Link Partner Next Page Ability
9h Reserved
10h Digital Reserved Control
11h AFE Control 1
12h - 14h Reserved
15h RXER Counter
16h Operation Mode Strap Override
17h Operation Mode Strap Status
18h Expanded Control
19h - 1Ah Reserved
1Bh Interrupt Control/Status
1Ch Reserved
1Dh LinkMD Control/Status
1Eh PHY Control 1
1Fh PHY Control 2
TABLE 4-2: REGISTER DESCRIPTIONS
Address Name Description
Mode
Note 4-1
Default
Register 0h – Basic Control
0.15 Reset 1 = Software reset
0 = Normal operation
This bit is self-cleared after a ‘1’ is written to it.
RW/SC 0
0.14 Loopback 1 = Loopback mode
0 = Normal operation
RW 0
0.13 Speed Select 1 = 100Mbps
0 = 10Mbps
This bit is ignored if auto-negotiation is enabled
(Register 0.12 = 1).
RW Set by the ANEN_-
SPEED strapping pin.
See the Strap-In
Options -
KSZ8081RNA/RND
section for details.