Datasheet

 2016-2017 Microchip Technology Inc. DS00002117F-page 31
KSZ9031RNX
4.0 REGISTER DESCRIPTIONS
This chapter describes the various control and status registers (CSRs).
4.1 Register Map
The register space within the KSZ9031RNX consists of two distinct areas.
• Standard registers // Direct register access
• MDIO Manageable device (MMD) registers // Indirect register access
The KSZ9031RNX supports the following standard registers.
The KSZ9031RNX supports the following MMD device addresses and their associated register addresses, which make
up the indirect MMD registers. These can be seen in Ta b l e 4-2.
TABLE 4-1: STANDARD REGISTERS SUPPORTED BY KSZ9031RNX
Register Number (hex) Description
IEEE-Defined Registers
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 Auto-Negotiation Link Partner Next Page Ability
9h 1000BASE-T Control
Ah 1000BASE-T Status
Bh - Ch Reserved
Dh MMD Access – Control
Eh MMD Access – Register/Data
Fh Extended Status
Vendor-Specific Registers
10h Reserved
11h Remote Loopback
12h LinkMD Cable Diagnostic
13h Digital PMA/PCS Status
14h Reserved
15h RXER Counter
16h - 1Ah Reserved
1Bh Interrupt Control/Status
1Ch Auto MDI/MDI-X
1Dh - 1Eh Reserved
1Fh PHY Control