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80221 Datasheet(PDF) 11 Page - LSI Computer Systems

Part # 80221
Description  100BASE-TX/10BASE-T Ethernet Media Interface Adapter
PDF  91 Pages
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Manufacturer  LSI [LSI Computer Systems]
Direct Link  http://www.lsicsi.com
Logo LSI - LSI Computer Systems

80221 Datasheet(HTML) 11 Page - LSI Computer Systems

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80220/80221
4-11
MD400159/E
11
Signals
Bit Value
TXDO
X
X
11
1
1
1
111
11
111
11
12
1
TXD1
X
X
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
TXD2
X
X
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
TXD3
X
X
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
1
TX_EN
0
0
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
D03 D44
D1
D5
D2
D6
D3
D7
11
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
X
11
1
111
111
11
111
11
12
1
RXD1
X
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
RXD2
X
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
RXD3
X
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
1
RX_DV
0
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
D03 D44
D1
D5
D2
D6
D3
D7
11
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.
Figure 3. MII Frame Format
c.) Transmit Preamble and SFD bits
d.) Receive 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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