參數(shù)資料
型號(hào)： LAN91C95
英文描述： LAN Node Controller
中文描述： 網(wǎng)絡(luò)節(jié)點(diǎn)控制器
文件頁(yè)數(shù)： 14/55頁(yè)
文件大?。?/td> 482K
代理商： LAN91C95
FEAST Fast Ethernet Controller
for PCMCIA and Generic 16-Bit Applications
SMSC DS – LAN91C110 REV. B
Page 14
Rev. 09/05/02
The transmit byte count least significant bit will be assumed 0 by the controller regardless of the value written in memory.
DATA AREA - The data area starts at offset 4 of the packet structure and can extend up to 2043 bytes.
The data area contains six bytes of DESTINATION ADDRESS followed by six bytes of SOURCE ADDRESS, followed by
a variable-length number of bytes. On transmit, all bytes are provided by the CPU, including the source address. The
LAN91C110 does not insert its own source address. On receive, all bytes are provided by the CSMA side.
The 802.3 Frame Length word (Frame Type in Ethernet) is not interpreted by the LAN91C110. It is treated transparently
as data both for transmit and receive operations.
CONTROL BYTE - For transmit packets the CONTROL BYTE is written by the CPU as:
X
X
ODD
CRC
0
0
0
0
ODD - If set, indicates an odd number of bytes, with the last byte being right before the CONTROL BYTE. If clear, the
number of data bytes is even and the byte before the CONTROL BYTE is not transmitted.
CRC - When set, CRC will be appended to the frame. This bit has only meaning if the NOCRC bit in the TCR is set.
For receive packets the CONTROL BYTE is written by the controller as:
0
1
ODD
0
0
0
0
0
ODD - If set, indicates an odd number of bytes, with the last byte being right before the CONTROL BYTE. If clear, the
number of data bytes is even and the byte before the CONTROL BYTE should be ignored.
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
ERR
CAST
CRC
ALGN
BROD
BAD
ODD
FRM
TOOLNG
TOO
SHORT
LOW
BYTE
HASH VALUE
MULT
CAST
5
4
3
2
1
0
ALGNERR - Frame had alignment error. When MII SEL=1 alignment error is set when BADCRC=1 and an odd number of
nibbles was received between SFD and RX_DV going inactive.
BRODCAST - Receive frame was broadcast.
BADCRC - Frame had CRC error, or RX_ER was asserted during reception.
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
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LAN91C96 制造商:SMSC 功能描述:
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LAN91C96(100TQFP) 制造商:未知廠家 制造商全稱:未知廠家 功能描述:LAN Node Controller
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