VSC8201 Просмотр технического описания (PDF) - Vitesse Semiconductor

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VSC8201

SimpliPHY® VSC8201 PCB Design and Layout Guide Single Port 10/100/1000BASE-Tand 1000BASE-X PHY

Vitesse Semiconductor 

VSC8201DL

Method III - RGMII Implementation Using the Internal Clock Delay Feature with Locally Generated 2.5v I/O Supply

In this mode the internal clock delay feature is used i.e. MII Register Bit 23.8 is set.

Board Layout

VDDIO_MAC=3.15 - 3.45v

VDDIO_PHY

VDDIO_MAC=3.15 - 3.45v

MAC

1N914

MA2J111

MA111

or

equivalent

470 ohms

RXC

RX_CTL

RD3

RD2

RD1

RD0

TD3

TD2

TD1

TD0

TX_CTL

TXC

0.1uf

0.001uf

VDDIO_PHY

VSC8201

Benefits

• Does not require an external 2.5v supply, thereby reducing system cost.

• Does not require any additional delays on the TXC and RXC traces.

Drawbacks

• Requires a diode and a resistor.

• The MAC which is at 3.3V should be capable of detecting 2.5V logic levels.

Rev. 1.6.3 - 9/29/04

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