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參數(shù)資料
| 型號(hào)： | 91C94 |
| 廠商： | SMSC Corporation |
| 英文描述： | ISA/PCMCIA SINGLE CHIP ETHERNET CONTROLLER WITH RAM |
| 中文描述： | 的ISA / PCMCIA的單芯片以太網(wǎng)控制器與RAM |
| 文件頁(yè)數(shù)： | 43/120頁(yè) |
| 文件大小： | 447K |
| 代理商： | 91C94 |
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29
RECEIVE FRAME STATUS WORD
This word is written at the beginning of each receive frame in memory. It is not available as a register.
HIGH
BYTE
ALGN
ERR
BROD
CAST
BADCRC
ODDFRM
TOOLNG
TOO
SHORT
LOW
BYTE
HASH VALUE
MULT
CAST
5
4
3
2
1
0
ALGNERR Frame had alignment error.
BRODCAST Receive frame was broadcast.
BADCRC Frame had CRC error.
ODDFRM This bit when set indicates that the
received frame had an odd number of bytes.
TOOLNG The received frame is longer than the
802.3 maximum size (1518 bytes on the cable).
TOOSHORT The received frame is shorter than
the 802.3 minimum size (64 bytes on the cable).
HASH VALUE Provides the hash value used to
index the Multicast Registers. Can be used by
receive routines to speed up the group address
search. The hash value consists of the six most
significant bits of the CRC calculated on the
Destination Address, and maps into the 64 bit
multicast table.
Bits 5,4,3 of the hash value
select a byte of the multicast table, while bits
2,1,0 determine the bit within the byte selected.
Examples of the address mapping:
ADDRESS
HASH VALUE 5-0
MULTICAST TABLE BIT
ED 00 00 00 00 00
0D 00 00 00 00 00
01 00 00 00 00 00
2F 00 00 00 00 00
000 000
010 000
100 111
111 111
MT-0 bit 0
MT-2 bit 0
MT-4 bit 7
MT-7 bit 7
MULTCAST
Receive frame was multicast.
If
hash value corresponds to a multicast table bit
that is set, and the address was a multicast,
the packet will pass address filtering regardless
of other filtering criteria.
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