LAN83C175 Datasheet, PDF (47/92 Pages) SMSC Corporation – Ethernet CARDBUS Integrated Controller With Modem Support

4C - BOARD ID/CHECKSUM
Power
Up
Reset
XXXXXXXXXXXXXXXX
Value:
These registers hold the board ID and the
checksum for the adapter. They are recalled
from EEPROM after reset.
31 through 16: Unused.
15 through 8 - BOARD ID: Used as the 8 bit
LAN adapter ID field.
7 through 0 - CHECKSUM: Used as the
checksum for the LAN address and board ID.
The sum of the 6 LAN address bytes, the
board ID and the checksum should be FF.
50 through 5C - MULTICAST ADDRESS
HASH TABLE
Reset Value: Unknown
These 4 registers hold the node's multicast
filter table.
31 through 16: Unused.
15 through 0 - HASH TABLE: The bits in the
hash table are decoded in the following order:
MC0 = 15-0
MC1 = 31-16
MC2 = 47-32
MC3 = 63-48
60 - RECEIVE CONTROL
Reset Value: XX00000000
31 through 10: Unused.
9 and 8 - EXTERNAL BUFFER SIZE SELECT:
When D9:8 = <00>, external buffer access is
disabled and all packets are buffered
internally. D9:8 = <01> -> 16K. D9:8 = <10> ->
32K. D9:8 = <11> -> 128K. These bits are
jumper set on reset.
7 - EARLY RECEIVE ENABLE: When set, the
receiver operates in early receive mode. When
early receive is enabled, save errored packets
must be set. The runt size (slot time) must be
programmed to a value greater than or equal to
224 bit times.
6 - MONITOR MODE: Disables the buffering of
receive packets. Receive status and counters
continue to function. Receive error interrupt will
not be posted in monitor mode.
5 - PROMISCUOUS MODE: When set, address
filtering is bypassed and all frames with individual
addresses are received.
4 - RECEIVE INVERSE INDIVIDUAL ADDRESS
FRAMES: When set, individually addressed
frames that do not match the programmed LAN
address register are received.
3 - RECEIVE MULTICAST FRAMES: When set,
multicast address filtering is enabled. Frames
that have multicast addressing and pass the
multicast hash filter will be received.
2 - RECEIVE BROADCAST FRAMES: When set,
broadcast frames are received.
1 - RECEIVE RUNT FRAMES: When set, frames
less than one slot time in length will be received.
0 - SAVE ERRORED PACKETS: When set,
frames with CRC and alignment errors are saved
in the receive buffers.
64 - RECEIVE STATUS
Reset Value: 0000000
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