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參數(shù)資料
| 型號(hào)： | LAN91C100FDTQFP |
| 廠商： | STANDARD MICROSYSTEMS CORP |
| 元件分類(lèi)： | 微控制器/微處理器 |
| 英文描述： | FEAST FAST ETHERNET CONTROLLER WITH FULL DUPLEX CAPABILITY |
| 中文描述： | 2 CHANNEL(S), 100M bps, LOCAL AREA NETWORK CONTROLLER, PQFP208 |
| 封裝： | TQFP-208 |
| 文件頁(yè)數(shù)： | 20/79頁(yè) |
| 文件大?。?/td> | 585K |
| 代理商： | LAN91C100FDTQFP |
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FEAST Fast Ethernet Controller with Full Duplex Capability
Rev.
10/14/2002
Page 20
SMSC DS – LAN91C100FD Rev. D
PRELIMINARY
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 LAN91C100FD 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 LAN91C100FD. 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 WORDRECEIVE 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
BAD
CRC
ODD
FRM
TOOLNG
TOO
SHORT
LOW
BYTE
HASH VALUE
MULT
CAST
5
4
3
2
1
0
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