VSC8658 datasheet(15/95 Pages) MICROSEMI

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Functional Descriptions

VMDS-10242 VSC8658 Datasheet Revision 4.1

Functional Descriptions

This section provides detailed information about how the VSC8658 device works, what configurations

and operational features are available, and how to test its function. It includes descriptions of the various

device interfaces and how to set them up.

With the information in this section, you can better determine which device setup parameters you must

access to configure the VSC8658 device to work in your application. There are three ways to configure

the VSC8658 device. You can access and set its internal memory registers, use a combination of the

device CMODE pins and its registers, or configure and connect an external EEPROM to execute a

configuration sequence upon system startup.

For information about VSC8658 device registers, see Configuration, page 26.

For information about the device CMODE pins, see CMODE, page 55.

For information about using an EEPROM with the VSC8658 device, see EEPROM, page 58.

4.1

Operating Modes

With respect to its function in your design, the VSC8658 device can act as the interface between a media

access controller (MAC) and either Category 5 (Cat5) media, 100BASE-FX fiber media, or 1000BASE-X

fiber media. Or, the VSC8658 device can act as a MAC-to-MAC pass-through device to take advantage

of the auto-negotiation feature.

Depending upon the speed of data throughput required in your application, the MAC may be either a

SerDes or an SGMII device, and can also be configured to support twisted pair Cat5 cabling, 100BASE-

FX/1000BASE-X fiber optic cabling, or copper small form factor pluggable (SFP) devices.

As shown in the following table, the operating mode you choose when setting up the VSC8658 device is

a function of which type of MAC is to be connected, which data throughput speeds are required in the

application, and the type of Cat5 media support required.

Table 2 •

Operating Mode vs. Speed

VSC8658 Mode

10/100/1000BAS

E-T Support

1000BASE-X

Fiber Optic

Support

100BASE-FX

Support

10/100/

1000BASE-T

Copper SFP

Support

SerDes MAC-to-Cat5 Link Partner

1000BASE-T

only

SGMII MAC-to-Cat5 Link Partner

Yes

SerDes MAC-to-SerDes with Auto-Negotiation

Yes

1000BASE-T

only

SGMII MAC-to-SerDes with Auto-Negotiation

Yes

1000BASE-T

only

SerDes MAC-to-SerDes with Pass-Through

Yes(1)

1000BASE-T

only(1)

SGMII MAC-to-SGMII with Pass-Through

Yes(1)

SGMII MAC-to-100BASE-FX

Yes

SerDes MAC with Automatic Media Sensing

(AMS) and Auto Negotiation

1000BASE-T

Only

Yes

SGMII MAC with AMS

Yes

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