SMC Networks SMC91C95 User Manual
Page 44
44
I/O SPACE - BANK0
OFFSET
NAME
TYPE
SYMBOL
4
RECEIVE CONTROL
REGISTER
READ/WRITE
RCR
HIGH
BYTE
SOFT_
RST
FILT_
CAR
0
0
0
0
STRIP_
CRC
RXEN
0
0
0
0
0
0
0
0
LOW
BYTE
ALMUL
PRMS
RX_
ABORT
0
0
0
0
0
0
0
0
SOFT_RST - Software activated Reset. Active
high. Initiated by writing this bit high and
terminated by writing the bit low. The SMC91C95
configuration is not preserved, except for
Configuration, Base, and IA0-IA5 Registers. The
EEPROM in both ISA and PCMCIA mode 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. Does not receive its own transmission
unless it is in full duplex.
RX_ABORT - This bit is set if a receive frame is
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
1
0
Run out of Memory
During Receive
1
1