參數資料
型號: LQ80221
英文描述: LAN Transceiver
中文描述: 網絡收發(fā)器
文件頁數: 11/91頁
文件大小: 907K
代理商: LQ80221
80220/80221
4-11
MD400159/E
Signals
Bit Value
TXDO
TXD1
TXD2
TXD3
TX_EN
X
X
X
X
0
X
X
X
X
0
1
1
0
1
0
1
1
0
1
0
1
1
0
1
0
1
1
0
1
0
1
1
0
1
0
1
1
0
1
0
1
1
0
1
0
1
1
0
1
0
1
1
0
1
0
1
1
0
1
0
1
1
0
1
0
1
1
0
1
0
1
1
0
1
0
1
1
0
1
0
1
1
2
0
1
0
1
1
0
1
1
1
D0
3
D1
D2
D3
1
D4
4
D5
D6
D7
1
1. 1st preamble nibble transmitted.
2. 1st sfd nibble transmittted.
3. 1st data nibble transmitted.
4. D0 thru D7 are the first 8 bits of the data field.
Signals Bit Value
RXDO
RXD1
RXD2
RXD3
RX_DV
X
X
X
X
0
1
1
0
1
0
1
1
0
1
0
1
1
0
1
0
1
1
0
1
0
1
1
0
1
0
1
1
0
1
0
1
1
0
1
0
1
1
0
1
0
1
1
0
1
0
1
1
0
1
0
1
1
0
1
0
1
1
0
1
0
1
1
0
1
0
1
1
0
1
0
1
1
0
1
0
1
1
2
0
1
0
1
1
0
1
1
1
D0
3
D1
D2
D3
1
D4
4
D5
D6
D7
1
1. 1st preamble nibble received. Depending on mode, device may eliminate
either all or some of the preamble nibbles, up to 1st SFD nibble.
2. 1st sfd nibble received.
3. 1st data nibble received.
4. D0 thru D7 are the first 8 bits of the data field.
d.) Receive Preamble and SFD Bits
Figure 3. MII Frame Format
c.) Transmit Preamble and SFD bits
a.) MII Frame Format
b.) MII Nibble Order
IDLE
PREAMBLE
PRMBLE
SFD
DATA 1
DATA N-1
DATA N
START
OF
FRAME
DELIM.
62 BT
DATA 2
DATA NIBBLES
2 BT
IDLE
TX_EN = 0
TX_EN = 0
TX_EN = 1
FIRST
NIBBLE
FIRST BIT
MAC’s SERIAL BIT STREAM
D0
D1
D2
D3
D4
D5
D6
D7
TXD0 / RXD0
TXD3 / RXD3
TXD2 / RXD2
TXD1 / RXD1
MSB
SECOND
NIBBLE
MII
NIBBLE
STREAM
LSB
= TX_EN = 0
= [ BETWEEN 64-1518 DATA BYTES ]
= [ 1 1 ]
= [ 1 0 1 0 ... ] 62 BITS LONG
IDLE
DATAn
SFD
PREAMBLE
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