VSC8658 datasheet(63/95 Pages) MICROSEMI

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Configuration

VMDS-10242 VSC8658 Datasheet Revision 4.1

Example 2 To configure an individual PHY to 100BASE-FX mode, first ensure that bit 15 = 0, then set

bits 10:8 to the correct PHY number to be configured for 100BASE-FX, then set bits 7:0 = 0x01, and

finally reset bit 15 = 1. Repeat these steps for each individual PHY.

5.5

CMODE

The information in this section provides a detailed description of the methods you can use to configure

the VSC8658 device using its CMODE pins. It includes descriptions of the registers that work together

with the CMODE pins to control the device function.

There are eight configuration mode (CMODE) pins on the VSC8658 device. For more information about

the physical location of the CMODE pins, see Pin Descriptions, page 72. Each of the CMODE pins maps

to four configuration bits, which means that each pin controls 16 possible settings for the device.

5.5.1

CMODE Pins and Related Functions

The following table lists the pin numbers and device functionality that are controlled by each

configuration bit.

5.5.2

Functions and Related CMODE Pins

The following table lists the pin and bit settings according to the device function and CMODE pin used to

configure them.

Table 58 •

CMODE Configuration Pins and Device Functions

CMODE Pin

Bit 3 (MSB) Control

Bit 2 Controls

Bit 1 Controls

Bit 0 (LSB) Controls

Reserved

Always set to logic 0

Link speed downshift

Speed and duplex [1]

Speed and duplex [0]

MAC auto-negotiation

ActiPHY

Advertise asymmetric

pause

Advertise symmetric

pause

Media interface [2]

SIGDET polarity

Clock speed 125 MHz

or 156 MHz selection

CLKOUT enable

Media interface [1]

LED fiber/copper

combine

LED blink or pulse

stretch [1]

LED blink or pulse

stretch [0]

Media interface [0]

LED3 combine or

separate

LED3 [1]

LED3 [0]

PHY address reversal

LED2 combine or

separate

LED2 [1]

LED2 [0]

PHY address [4]

LED1 combine or

separate

LED1 [1]

LED1 [0]

PHY address [3]

LED0 combine or

separate

LED0 [1]

LED0 [0]

Table 59 •

Device Functions and Associated CMODE Pins

Function

Sets MII

CMODE

Bit

Description

Link speed

downshift

bit 4

0 = Link only according to the auto-negotiation resolution.

1 = Enable link speed downshift feature.

Speed and duplex

bits 8:5 and

bits 9:8

1 and 0 00 = 10/100/1000BASE-T FDX/HDX. 1000BASE-X

FDX/HDX.

01 = 10/100/1000BASE-T FDX; 10/100BASE-T HDX.

1000BASE-X FDX.

10 = 1000BASE-T FDX only.

11 = 10/100BASE-T FDX/HDX.

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