DP83861 datasheet(8/88 Pages) NSC

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1.4 E

2PROM Interface

1.5 Clock Interface

1.6 LED/Interrupt Interface

Signal Name

Type

PIn #

Description

SDA

I/O, PU

189

Serial Data: See application note “DP83861 EN Gig PHYTER

E2PROM Usage Guide” on how to use this interface. This pin should

be left floating if the E2PROM interface is not used.

SCL

I/O, PD

190

SERIAL CLOCK: See application note “DP83861 EN Gig PHYTER

E2PROM Usage Guide” on how to use this interface. This pin should

be left floating if the E2PROM interface is not used.

Signal Name

Type

Pin #

Description

REF_CLK

153

CLOCK INPUT: 125 MHz or 25 MHz (both require +/-50ppm toler-

ance and less than 200 ps of jitter) See Section 3.4.

REF_SEL

154

Clock Select: This pin enables the use of a 125 MHz clock source to

REF_CLK when pulled directly or through a 2K

Ω resistor to 3.3V sup-

ply. When pulled low directly or through a 2K

Ω resistor to ground en-

ables a 25 MHz clock source. This pin should never be floated.

Signal Name

Type

PIn #

Description

LED_RX

I/O, S, PD

207

RECEIVE ACTIVITY LED: The Receive LED output indicates that the

PHY is receiving.

LED_TX

I/O, S, PD

205

TRANSMIT ACTIVITY LED: The Transmit LED output indicates that

the PHY is transmitting.

LED_LNK

I/O, S, PD

204

GOOD LINK LED STATUS: Indicates status for Good Link the crite-

ria for good link are:

10BASE-T: Link is established by detecting Normal Link Pulses sep-

arated by 16 ms or by packet data received.

100BASE-T: Link is established as a result of an input receive ampli-

tude compliant with TP-PMD specifications which will result in internal

generation of Signal Detect. LED_LNK will assert after the internal

Signal Detect has remained asserted for a minimum of 500

µs.

LED_LNK will de-assert immediately following the de-assertion of the

internal Signal Detect.

1000BASE-T: Link is established as a result of training, Auto-Negoti-

ation completed, valid 1000BASE-T link established and reliable re-

ception of signals transmitted from a remote PHY is established.

LED_DUPLEX

I/O, S, PD

185

DUPLEX LED STATUS: If the LED is on, it indicates Full Duplex

mode of operation, else Half Duplex operation.

LED_COL

I/O, S, PD

201

COLLISION LED STATUS: Indicates that the PHY has detected a

collision condition (simultaneous transmit and receive activity while in

Half Duplex mode).

LED_ACT

I/O, S, PU

200

TX/RX ACTIVITY LED STATUS: Indicates either transmit or receive

activity.

LED_10

I/O, S, PD

180

10 Mb/s SPEED LED: If LED is on, then the current speed of opera-

tion is 10 Mb/s. 1

LED_100

I/O, S, PU

181

100 Mb/s SPEED LED: If LED is on, then the current speed of oper-

ation is 100 Mb/s. 1

LED_1000

I/O, S, PU

184

1000 Mb/s SPEED LED: If LED is on, then the current speed of op-

eration is 1000 Mb/s. 1

DP83861 Datasheet(PDF) 8 Page - National Semiconductor (TI)

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