I/O SPACE - BANK 0
OFFSET
4
NAME
TYPE
SYMBOL
RCR
RECEIVE CONTROL REGISTER
READ/WRITE
HIGH
BYTE
SOFT
RST
FILT CAR
0
0
0
0
0
0
0
0
0
STRIP
CRC
RXEN
0
0
0
LOW
BYTE
ALMUL
0
PRMS
0
RX_
ABORT
0
0
0
0
0
0
SOFT_RST Software-activated Reset. Active
high. Initiated by writing this bit high and
RXEN Enables the receiver when set. If
cleared, completes receiving current frame and
then goes idle. Defaults low on reset.
terminated by writing the bit low.
The
LAN91C100's configuration is not preserved
except for Configuration, Base, and IA0-5
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.
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!)
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 2044
bytes. The frame will not be received. The bit is
cleared by RESET or by the CPU writing it low.
STRIP_CRC When set, it strips the CRC on
received frames. When clear, the CRC is stored
in memory following the packet. Defaults low.
26
SMSC [ SMSC CORPORATION ]
