LAN91C94 datasheet(40/120 Pages) SMSC

40 / 120 page

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OFFSET

NAME

RECEIVE CONTROL REGISTER

TYPE

READ/WRITE

SYMBOL

RCR

HIGH BYTE

SOFT RST

FILT_CAR

STRIP CRC

RXEN

LOW BYTE

ALMUL

PRMS

RX_

ABORT

SOFT_RST - Software activated Reset. Active

high. Valid for ISA and PCMCIA. Initiated by

writing this bit high and terminated by writing the

bit

low.

LAN91C94

configuration

not

preserved, except for Configuration, Base, IA0-

5, COR, and CSR Registers. EEPROM is not

reloaded after software reset.

FILT_CAR - Filter Carrier. When set filters

leading edge of carrier sense for 12 bit times.

Otherwise recognizes a receive frame as soon

as carrier sense is active.

STRIP_CRC - When set it strips the CRC on

received frames. When clear the CRC is stored

in memory following the packet. Defaults low.

RXEN - Enables the receiver when set. If

cleared, completes receiving current frame and

then goes idle. Defaults low on reset.

ALMUL - When set accepts all multicast frames

(frames in which the first bit of DA is '1'). When

clear accepts only the multicast frames that

match the multicast table setting. Defaults low.

PRMS - Promiscuous mode. When set receives

all

frames,

regardless

their

destination

address. Does not receive its own transmission

unless FDUPX = 1.

RX_ABORT - This bit is set if a receive frame

was aborted due to length longer than 1532

bytes. The frame will not be received. The bit is

cleared by RESET or by the CPU writing it low.

RX_ABORT

RX_OVRN_ INT

Packet Too Long

Run out of Memory

During Receive

LAN91C94 Datasheet(PDF) 40 Page - SMSC Corporation

LAN91C94 Datasheet(HTML) 40 Page - SMSC Corporation

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