DP83907 datasheet(7/70 Pages) NSC

7 / 70 page

20 Pin Description (Continued)

Pin No

Pin Name

Type

Description

EXTERNAL MEMORY SUPPORT

(Continued)

RCS

RAM CHIP SELECT

Drives the chip select of the external RAM

MOS

BPCS

BOOT PROM CHIP SELECT

Selects the boot PROM on the memory support data bus

This is for READ only

MOS

EECS

EEPROM CHIP SELECT

Strobes data from the EEPROM onto the memory support

data bus

MOS

POWER SUPPLY PINS

AVCC

ANALOG 5V SUPPLY PIN

This pin supplies 5V to the DP83907’s analog circuitry To

maximize data recovery it is recommended that analog layout and decoupling rules be

applied between this pin and AGND

AGND

ANALOG NEGATIVE (GROUND) SUPPLY PIN

35 48

XVCC TPVCC

PHYSICAL MEDIA 5V SUPPLY PINS

This pin supplies 5V to the DP83907’s analog

physical media interface circuitry

32 49

XGND TPGND

PHYSICAL MEDIA NEGATIVE (GROUND) SUPPLY PINS

This pin is the ground to the

DP83907’s analog physical media interface circuitry

26 109

coreVCC

POSITIVE 5V SUPPLY PINS

These pins suppy power to the DP83907

27 110

coreGND

NEGATIVE (GROUND) SUPPLY PINS

These are the supply pins for the DP83907 It is

suggested that decoupling capacitors be 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

20 70 103

VCC

POSITIVE 5V SUPPLY PINS

These pins supply power to the DP83907 Output Drivers

eg SD MSD MSA Chip selects

14 17 23

GND

NEGATIVE (GROUND) SUPPLY PINS

These are the supply pins for the DP83907

Drivers It is suggested that decoupling capacitors be connected between the VCC and

28 57 75

GND pins It is essential to provide a path to ground for the GND pins with the lowest

100 106113

possible impedance

116 131

Note

Driver Types are I e Input O e Output IO e Bi-directional Output OCH e Open Collector 3ST 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

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