AM79C873 datasheet(9/44 Pages) AMD

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Am79C873

PRELIMINARY

RX_EN

Receive Enable

Input

This pin is active high enabled for receive signals

RXD[3:0], RX_CLK, RX_DV and RX_ER. A low on this

input tri-states these output pins. For normal operation

in a NODE application, this pin should be pulled high.

Media Interface

RXI±

100/10 Mbps-TX/T Twisted Pair Differential Input

Pair

Input

These pins are the differential receive input for

10BASE-T and 100BASE-TX. They are capable of re-

ceiving 100BASE-TX MLT-3 or 10BASE-T Manchester

encoded data.

FXRD±

100BASE-FX PECL Differential Input Pair

Input

These pins are the differential receive input for

100BASE-FX. They are capable of receiving

100BASE-FX.

FXSD±

100BASE-FX PECL Signal Detect

Input

These input signals from the FX-PMD transceiver indi-

cate detection of a receive signal from the Fiber Media.

10TXO±

10BASE-T Differential Output Pair

Output

This output pair provides controlled rise and fall times

designed to ﬁlter the transmitters output.

100TXO±

100BASE-TX Twisted Pair Differential Output Pair

Output

This output pair drives MLT-3 encoded data to the

100 M twisted pair cable and provides controlled rise

and fall times designed to ﬁlter the transmitters output,

reducing any associated EMI.

FXTD±

100BASE-FX PECL Differential Output PairOutput

These pins are the differential transmit output for

100BASE-FX. They are capable of transmitting

100BASE-FX

LED Interface

These outputs can directly drive LEDs or provide status

information to a network management device.

FDXLED (POLLED)

Polarity/Full Duplex LED

Output

This pin indicates Full Duplex mode status for 100

Mbps and 10 Mbps operation (Active low). If bit 4 of

function will change to indicate the Polarity status for 10

Mbps operation. If polarity is inverted, the POLLED will

go ON.

COLLED

Collision LED

Output

This pin indicates the presence of collision activity for

10 Mbps and 100 Mbps operation. This LED has no

meaning for 10 Mbps or 100 Mbps Full Duplex opera-

tion (Active low).

LINKLED (TRAFFIC LED)

Link LED

Output

This pin indicates Good Link status for 10 Mbps and

100 Mbps operation (Active low). It functions as the

TRAFFIC LED when bit 5 of register 16 is set to 1. In

TRAFFIC LED mode, it is always ON when the link is

OK. The TRAFFIC LED ﬂashes when transmitting or

receiving.

RXLED

Receive LED

Output Drain

This pin indicates the presence of receive activity for 10

Mbps and 100 Mbps operation (Active low). The Net-

PHY-1 device incorporates a “monostable” function on

the RXLED output. This ensures that even minimal re-

ceive activity will generate an adequate LED ON time.

TXLED

Transmit LED

Output Drain

This pin indicates the presence of transmit activity for 10

Mbps and 100 Mbps operation (Active low). The Net-

PHY-1 device incorporates a “monostable” function on

the TXLED output. This ensures that even minimal

transmit activity will generate an adequate LED ON time.

Device Conﬁguration/Control/Status

Interface

UTP

UTP Cable Indication

Output

This pin is the UTP Cable Indication. When UTP=1, it

indicates that the UTP cable is being used.

SPEED10

Speed 10 Mbps

Output

When set high, this bit indicates a 10 Mbps operation,

when set low 100 Mbps operation. This pin can drive

a low current LED to indicate that 100 Mbps operation

is selected.

RX_LOCK

Lock for Clock/Data Recovery PLL

Output

When this pin is high, it indicates that the receiver re-

covery PLL logic has locked to the input data stream.

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