91C100FDREVB datasheet(22/68 Pages) SMSC

22 / 68 page

SMSC DS – LAN91C100FD REV. B

Page 22

Rev. 05/31/2000

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OFFSET

NAME

TYPE

SYMBOL

RECEIVE CONTROL REGISTER

READ/WRITE

RCR

HIGH

BYTE

SOFT

RST

FILT

CAR

ABORT_

ENB

Reserved

STRIP

CRC

RXEN

LOW

BYTE

Reserved

ALMUL

PRMS

RX_

ABORT

SOFT_RST - Software-Activated Reset. Active high. Initiated by writing this bit high and terminated by writing the bit low.

The LAN91C100FD’s configuration is not preserved except for Configuration, Base, and IA0-IA5 Registers. EEPROM is

not reloaded after software reset.

FILT_CAR - Filter Carrier. When set filters leading edge of carrier sense for 12 bit times (3 nibble times). Otherwise

recognizes a receive frame as soon as carrier sense is active. (Does NOT filter RX DV on MII!)

ABORT_ENB - Enables abort of receive when collision occurs. Defaults low. When set, the LAN91C100FD will

automatically abort a packet being received when the appropriate collision input is activated (COL100 for MII, COL for non-

MII). This bit has no effect if the SWFDUP bit in the TCR is set.

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. Does not receive its own transmission unless it is in Full

Duplex!

RX_ABORT - This bit is set if a receive frame was aborted due to length longer than 2K bytes. The frame will not be

received. The bit is cleared by RESET or by the CPU writing it low.

Reserved - Must be 0.

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