VSC8540RT datasheet(36/87 Pages) MICROCHIP

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VSC8540RT

DS60001603E-page 36

 2022 Microchip Technology Inc. and its subsidiaries

6.0

REGISTERS

This section provides information about how to configure the VSC8540RT device using their internal memory registers

and the management interface. The registers marked reserved and factory test should not be read or written to, because

doing so may produce undesired effects.

The default value documented for registers is based on the value at reset; in some cases, that value may change imme-

diately after reset.

The access type for each register is shown using the following abbreviations:

• RO: Read Only

• ROCR: Read Only, Clear on Read

• RO/LH: Read Only, Latch High

• RO/LL: Read Only, Latch Low

• R/W: Read and Write

• RWSC: Read and Write, Self-Clearing

The VSC8540RT device uses several different types of registers:

• IEEE Clause 22 device registers with addresses from 0 to 31

• Two pages of extended registers with addresses from 17E1–30E1 and 16E2–30E2

• General-purpose registers with addresses from 0G to 30G

• IEEE Clause 45 device registers accessible through the Clause 22 registers 13 and 14 to support IEEE 802.3az-

2010 Energy-Efficient Ethernet registers and IEEE 802.3bf-2011 registers

The following illustration shows the relationship between the device registers and their address spaces.

FIGURE 6-1:

Reserved Registers

For main registers 16–31, extended registers 17E1–30E1, 16E2–30E2, and general purpose registers 0G–30G, any bits

marked as Reserved should be processed as read-only and their states as undefined.

Reserved Bits

In writing to registers with reserved bits, use a read-modify-then-write technique, where the entire register is read but

only the intended bits to be changed are modified. Reserved bits cannot be changed and their read state cannot be

considered static or unchanging.

6.1

This document refers to registers by their address and bit number in decimal notation. A range of bits is indicated with

a colon. For example, a reference to address 26, bits 15 through 14 is shown as 26.15:14.

A register with an E and a number attached (such as 27E1) means it is a register contained within extended register

page number 1. A register with a G attached (such as 13G) means it is a GPIO page register.

IEEE 802.3

Standard

Registers

Main Registers

0x0000

Extended

Registers 1

0x0001

16E1

17E1

18E1

19E1

30E1

Extended

Registers 2

0x0002

16E2

17E2

18E2

19E2

30E2

General Purpose

Registers

0x0010

15G

16G

17G

18G

19G

30G

Clause 45

Registers

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