DP83950B datasheet(38/80 Pages) NSC

38 / 80 page

50 Functional Description (Continued)

TABLE 51 Pin Definitions for Options in the Mode Load Operation

(Continued)

Programming

Effect When

Function

Name

Function

Bit is 0

Bit is 1

RA0

BYPAS1

These configuration bits select which of the repeater ports

(numbers 2 to 13) are configured to use the on-chip internal

10BASE-T transceivers or the external transceiver interface The

external transceiver interface operates using AUI compatible

signal levels

RA1

BYPAS2

BYPAS1

Information

All ports (2 to 13) use the external

Transceiver Interface

Ports 2 to 7 use the external

interface 8 to 13 use the internal

10BASE-T transceivers

Ports 2 to 5 use the external

interface 6 to 13 use the internal

10BASE-T transceivers

All ports (2 to 13) use the internal

10BASE-T transceivers

RA2

BINV

Active High

Active Low

This selection determines whether the Inter-RIC signals IRE

ACTN ANYXN COLN and Management bus signal MCRS are

Signals

active high or low

RA3

EXPLL

External PLL

Internal PLL

If desired the RIC may be used with an external decoder this

configuration bit performs the selection

RA4

resv

Not Permitted

Required

To ensure correct device operation this bit must be written with

a logic one during the mode load operation

DP83950B Datasheet(PDF) 38 Page - National Semiconductor (TI)

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