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Registers

VMDS-10507 VSC8504-02 Datasheet Revision 4.2

4Registers

This section provides information about how to configure the VSC8504-02 using its 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; however, in some cases, that

value may change immediately 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 Write Self Clearing

The VSC8504-02 uses several different types of registers:

•

IEEE Clause 22 device registers with addresses from 0 to 31

•

Three pages of extended registers with addresses from 16E1–30E1, 16E2–30E2, and 16E3–30E3

•

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

•

IEEE Clause 45 devices registers accessible through the Clause 22 registers 13 and 14 to support

IEEE 802.3az-2010 energy efficient Ethernet registers

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

Figure 37 •

Reserved Registers—For main registers 16–31, extended registers 16E1–30E1, 16E2–30E2, 16E3–

30E3, 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.

4.1

Registers are referred to 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 (example 27E1) means it is a register contained within

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

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

Extended

Registers 3

0x0003

16E3

17E3

18E3

19E3

30E3

General Purpose

Registers

0x0010

15G

16G

17G

18G

19G

30G

Clause 45

Registers

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