VSC8658 datasheet(65/95 Pages) MICROSEMI

65 / 95 page

Configuration

VMDS-10242 VSC8658 Datasheet Revision 4.1

Note: The MAC auto-negotiation, LED_0, LED_1, LED_2, and LED_3 settings available using the CMODE

pins and configuration bits is limited. For full functionality, use the registers. For more information about

using the registers for these and other functions, see Registers, page 26.

5.5.3

CMODE Resistor Values

To affect an aspect of the VSC8658 device configuration, find the parameter in Table 58, page 55 or in

Table 59, page 55, and connect the associated pin to the resistor specified in the following table. This

sets the bits as shown.

Address reversal

0 = Normal functioning.

PHY address 0:7 = Port 0:7.

1 = Reversed functioning.

PHY address 7:0 = Port 0:7.

LED_2 indication

function

bits 11:8

1 and 0 00 = Link or activity.

01 = Duplex or collision.

10 = Fiber_Activity.

11 = Link10 or activity.

PHY address [4:3]

1 and 0

Sets the two MSBs of the PHY address.

LED_1 indication

function

bits 7:4

1 and 0 00 = Link100 or activity.

01 = Link100/1000 or activity.

10 = Link 10/100 or activity.

11 = Fiber_Link/Fiber_Activity.

LED_0 indication

function

bits 3:0

1 and 0 00 = Link1000 or activity.

01 = Link100/1000 or activity.

10 = Activity.

11 = Link or activity.

Table 60 •

CMODE Resistor Values and Resultant Bit Settings

With CMODE

Pin Tied To

With 1%

Resistor Value

Set

Bit 3 (MSB) to:

Set

Bit 2 to:

Set

Bit 1 to:

Set

Bit 0 (LSB) to:

VSS

2.26 k

Ω

VSS

4.02 k

Ω

VSS

5.90 k

Ω

VSS

8.25 k

Ω

VSS

12.1 k

Ω

VSS

16.9 k

Ω

VSS

22.6 k

Ω

VDD33

2.26 k

Ω

VDD33

4.02 k

Ω

VDD33

5.90 k

Ω

VDD33

8.25 k

Ω

VDD33

12.1 k

Ω

Table 59 •

Device Functions and Associated CMODE Pins (continued)

Function

Sets MII

CMODE

Bit

Description

VSC8658 Datasheet(PDF) 65 Page - Microsemi Corporation

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