LAN91C94 datasheet(44/120 Pages) SMSC

44 / 120 page

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OFFSET

NAME

CONFIGURATION REGISTER

TYPE

READ/WRITE

SYMBOL

The Configuration Register holds bits that define the device configuration and are not expected to

change during run-time. This register is part of the EEPROM saved setup.

HIGH

BYTE

NO WAIT

FULL

STEP

SET

SQLCH

AUI

SELECT

LOW

BYTE

16 BIT

DIS LINK

RESERVED

INT SEL1

INT SEL0

Function of

nEN16 pin

NO WAIT - When set, does not request

additional wait states. An exception to this are

accesses to the Data Register if not ready for a

transfer. When clear, negates IOCHRDY for two

to three 20MHz clocks on any cycle to the

LAN91C94.

FULL STEP - This bit is used to select the

signaling mode for the AUI port. When set the

AUI port uses full step signaling. Defaults low to

half step signaling. This bit is only meaningful

when AUI SELECT is high.

SET SQLCH - When set, the squelch level used

for the 10BASE-T receive signal is 240mV.

When

clear

the

receive

squelch

level

400mV.Defaults low.

AUI SELECT - When set the AUI interface is

used, when clear the 10BASE-T interface is

used. Defaults low.

16BIT - Used in conjunction with nEN16 and

IOis8 (in PCMCIA mode only) to define the

width of the system bus. If the nEN16 pin is low,

this bit is forced high. Otherwise the bit defaults

low and can be programmed by the host CPU.

DIS LINK - This bit is used to disable the

10BASE-T link test functions. When this bit is

high the LAN91C94 disables link test functions

by not generating nor monitoring the network for

link pulses. In this mode the LAN91C94 will

transmit packets regardless of the link test, the

EPHSR LINK_OK bit will be set and the LINK

LED will stay on. When low the link test

functions are enabled. If the link status indicates

FAIL, the EPHSR LINK_OK bit will be low, while

transmit packets enqueued will be processed by

the LAN91C94, transmit data will not be sent

out to the cable.

INT SEL1-0 - Used to select one out of four

interrupt pins. The three unused interrupts are

tristated.

LAN91C94 Datasheet(PDF) 44 Page - SMSC Corporation

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