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AM79C901A

HomePHY™ Single-Chip 1/10 Mbps Home Networking PHY

Advanced Micro Devices 

PIN DESIGNATIONS (PL 068)

Listed By Group

PRELIMINARY

Pin Name

Pin Function

Configuration

MII/GPSI

Selects MII or GPSI mode

GM_MODE

Selects MDC/MDIO and GPSI data

ISOLATE

Isolates device if register isolate bit is set = 1

PHY_SEL

Defines default PHY

PHY_AD

Defines bit 2 of the PHY address

Board Interface

RESET

RESET

XCLK/XTAL

Oscillator/Crystal Select

XTAL1

Crystal Input (20 MHz XTAL/60 MHz CLK)

XTAL2

Crystal Output (20 MHz XTAL)

IREF

Tied to GND via a 12.1 kΩ 1% resistor

LED_COL

Collision Indication

LED_ACTIVITY

Activity Indication

LED_LINK

Link Valid Indication

LED_SPEED

High Speed Indication

LED_POWER

High Power Indication

1 Mbps HomePNA PHY Network Ports

HRTXRXP/N

Receive/Transmit Data

10BASE-T PHY Network Ports

TX±

Serial Transmit Data

RX±

Serial Receive Data

MII Interface

TX_CLK

MII Transmit Clock

TXD[3:0]

MII Transmit Data

TX_EN

MII Transmit Enable

RX_CLK

MII Receive Clock

RXD[3:0]

MII Receive Data

RX_ER

MII Receive Error

RX_DV

MII Receive Data Valid

MDC

MII Management Data Clock

MDIO

MII Management Data Input/Output

CRS

Carrier Sense

COL

Collision

Type

Driver Type

Number of

Pins

I

–

1

I

–

1

I

–

1

I

–

1

I

–

1

I

–

1

I

–

1

I

–

1

O

XTAL

1

I

–

1

O

LED

1

O

LED

1

O

LED

1

O

LED

1

O

LED

1

I/O

–

2

O

–

2

I

–

2

O

OMII

1

I

–

4

I

–

1

O

OMII

1

O

OMII

4

O

OMII

1

O

OMII

1

I

–

1

I/O

TSMII

1

O

OMII

1

O

OMII

1

12

Am79C901A

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