DP83905AVQB datasheet(7/80 Pages) NSC

7 / 80 page

20 Pin Description (Continued)

Pin No

Pin Name

Type

Description

EXTERNAL MEMORY SUPPORT (Continued)

RCS1

RAM CHIP SELECT 1

Drives the chip select of the external RAM on the lower half

of the memory support data bus

MOS

RCS2

RAM CHIP SELECT 2

Drives the chip select of the external RAM on the upper half

of the memory support data bus

MOS

EECS

EEPROM CHIP SELECT

Strobes data from the EEPROM onto the memory support

data bus

MOS

EECONFIG

CONFIGURE FROM EEPROM

When this pin is tied high the ATLANTIC Controller

loads the configuration from an EEPROM

TTL

BSCLK

INTERNAL BUS CLOCK

This controls the speed of the NIC core if it is not running

off of an internal clock (see Configuration Register C) This pin should be tied to

TTL

ground if it is unused

LOW POWER SUPPORT

LOWPWR

LOW POWER

Instructs ATLANTIC Controller to enter its low power mode as

detailed in Section 45 Should be tied to ground for normal operation

TTL

TEST SUPPORT

TEST

This input is only used for test mode It should be left unconnected as it has

an internal pull-down resistor which will enable correct operation

MOS

POWER SUPPLY PINS

160

PLLVCC

PLL 5V SUPPLY PINS

This pin supplies 5V to the ATLANTIC’s analog PLL inside

the ENDEC block To maximize data recovery it is recommended that analog layout

and decoupling rules be applied between this pin and PLLGND

159

PLLGND

PLL NEGATIVE (GROUND) SUPPLY PINS

157 152

PVCC

PHYSICAL MEDIA 5V SUPPLY PINS

These pins supply 5V to the ATLANTIC’s

analog physical media interface circuitry

144 143

139

158 149

PGND

PHYSICAL LAYER NEGATIVE (GROUND) SUPPLY PINS

These pins are the

ground to the ATLANTIC’s analog physical media interface circuitry

140 138

9OVCC

OSClLLATOR 5V SUPPLY PINS

This pin supplies 5V to the ATLANTIC’s oscillator

and LED circuitry

OGND

OSCILLATOR NEGATIVE (GROUND) SUPPLY PINS

This pin is the ground to the

ATLANTIC’s oscillator and LED circuitry

59 49

VCC

POSITIVE 5V SUPPLY PINS

These pins supply power to the ATLANTIC

Controller’s logic

24 13

60 54 44

GND

NEGATIVE (GROUND) SUPPLY PINS

These are the supply pins for the

ATLANTIC Controller’s logic It is suggested that decoupling capacitors be

35 23 14

connected between the VCC and GND pins It is essential to provide a path to ground

for the GND pins with the lowest possible impedance

132 121

IFVCC

INTERFACE POSITIVE 5V SUPPLY PINS

These pins supply power to the

ATLANTIC Controller’s ISA interface

107 87 68

135 129

lFGND

INTERFACE NEGATIVE (GROUND) SUPPLY PINS

These are the supply pins for

the ATLANTIC Controller’s ISA interface It is suggested that decoupling capacitors

125 124

be connected between the IFVCC and IFGND pins It is essential to provide a path to

116 98

ground for the IFGND pins with the lowest possible impedance

85 71 65

Driver Types are I e Input O e Output IO e Bi-directional Output OCH e Open Collector 3SH e TRI-STATE Output TTL e TTL Compatible AUI e

Attachment Unit Interface TPI e Twisted Pair Interface LED e LED Drive MOS e CMOS Level Compatible XTAL e Crystal

DP83905AVQB Datasheet(PDF) 7 Page - National Semiconductor (TI)

DP83905AVQB Datasheet(HTML) 7 Page - National Semiconductor (TI)

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