VSC8658 datasheet(34/95 Pages) MICROSEMI

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Configuration

VMDS-10242 VSC8658 Datasheet Revision 4.1

Configuration

The VSC8658 device can be configured using three different methods:

•

Setting internal memory registers using the management interface

•

Setting a combination of CMODE pins and registers

•

Loading a configuration into an external EEPROM and connecting that device so that it writes

configuration information at system startup

5.1

Registers

This section provides information about how to configure the VSC8658 device using its internal memory

registers and the management interface. For information about configuring the device using the CMODE

pins, see CMODE, page 55. For information about setting up an external EEPROM to perform startup

configuration, see EEPROM, page 58.

The VSC8658 device uses three types of registers:

•

IEEE standard and main device registers with addresses from 0 to 31

•

Extended registers with addresses from 16E through 30E

•

General-purpose input and output (GPIO) registers with addresses from 0G to 30G

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

Figure 17 •

5.1.1

Reserved Registers

For main registers 16 through 31, extended registers 16E through 30E, and GPIO registers 0G through

30G, any bits marked as “Reserved” should be processed as read only and their states as undefined.

IEEE 802.3

Standard Registers

Extended Registers

Main Registers

0x0000

0x0001

GPIO Registers

0x0010

15G

16G

30G

16E

17E

18E

19E

30E

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