VSC8658 datasheet(16/95 Pages) MICROSEMI

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Functional Descriptions

VMDS-10242 VSC8658 Datasheet Revision 4.1

4.1.1

SerDes MAC-to-Cat5 Mode MAC Interface

When connected to a SerDes MAC, the VSC8658 device provides data throughput at a rate of

1000 Mbps only; 10 Mbps and 100 Mbps rates are not supported. To configure the device for operation in

this mode, select the 1000BASE-T-only setting in the registers, using the CMODE pin, or in the external

EEPROM startup sequence.

For information about using the device registers to configure the VSC8658 device for operation in

SerDes MAC-to-Cat5 mode, see Mode Control, page 28.

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.

The following illustration shows a typical connection of the VSC8658 device to a SerDes MAC.

Figure 3 •

SerDes MAC Interface

4.1.2

SGMII MAC-to-Cat5 Mode MAC Interface

When configured to detect and switch between 10BASE-T, 100BASE-T, and 1000BASE-T data rates, the

VSC8658 device can be connected to an SGMII-compatible MAC.

For information about using the device registers to configure the VSC8658 device for operation in

SerDes MAC-to-Cat5 Mode, see Mode Control, page 28.

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.

The following illustration shows a typical connection of the VSC8658 device to an SGMII-compatible

MAC.

SerDes MAC with AMS and Pass-Through

1000BASE-T

Only

Yes(1)

1000BASE-T

only(1)

SGMII MAC with AMS and Pass-Through

Yes

Yes(1)

The MAC used must be capable of supporting this media.

Table 2 •

Operating Mode vs. Speed (continued)

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

VSC8658

PHY Port_n

MAC_TDP

MAC_TDN

MAC_RDN

MAC_RDP

RDN

RDP

TDN

TDP

100

Ω

150

Ω

0.1 µF

100

Ω

150

Ω

100

Ω

150

Ω

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