DP83816 datasheet(9/106 Pages) NSC

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2.0 Pin Description (Continued)

Note: DP83816 supports NMC93C46 for the EEPROM device.

Clock Interface

Symbol

LQFP Pin

No(s)

Dir

Description

Crystal/Oscillator Input: This pin is the primary clock reference input for the

DP83816 and must be connected to a 25 MHz 0.005% (50ppm) clock source. The

DP83816 device supports either an external crystal resonator connected across

pins X1 and X2, or an external CMOS-level oscillator source connected to pin X1

only.

Crystal Output: This pin is used in conjunction with the X1 pin to connect to an

external 25 MHz crystal resonator device. This pin must be left unconnected if an

external CMOS oscillator clock source is utilized. For more information see the

definition for pin X1.

LED Interface

Symbol

LQFP Pin

No(s)

Dir

Description

LEDACTN/MA0

142

TX/RX Activity: This pin is an output indicating transmit/receive activity. This pin is

driven low to indicate active transmission or reception, and can be used to drive a

low current LED (<6 mA). The activity event is stretched to a minimum duration of

approximately 50 ms.

LED100N/MA2

144

100 Mb/s Link: This pin is an output indicating the 100 Mb/s Link status. This pin is

driven low to indicate Good Link status for 100 Mb/s operation, and can be used to

drive a low current LED (<6 mA).

LED10N/MA1

143

10 Mb/s Link: This pin is an output indicating the 10 Mb/s Link status. This pin is

driven low to indicate Good Link status for 10 Mb/s operation, and can be used to

drive a low current LED (<6 mA).

Serial EEPROM Interface

Symbol

LQFP Pin

No(s)

Dir

Description

EESEL

128

EEPROM Chip Select: This signal is used to enable an external EEPROM device.

EECLK/MA4

EEPROM Clock: During an EEPROM access (EESEL asserted), this pin is an

output used to drive the serial clock to an external EEPROM device.

EEDI/MA3

EEPROM Data In: During an EEPROM access (EESEL asserted), this pin is an

output used to drive opcode, address, and data to an external serial EEPROM

device.

EEDO/MD4

138

EEPROM Data Out: During an EEPROM access (EESEL asserted), this pin is an

input used to retrieve EEPROM serial read data.

This pin has an internal weak pull up.

MD1/CFGDISN

133

I/O

Configuration Disable: When pulled low at power-on time, disables load of

configuration data from the EEPROM. Use 1 K

Ω to ground to disable configuration

load.

DP83816 Datasheet(PDF) 9 Page - National Semiconductor (TI)

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