L80223 LSI, L80223 Datasheet - Page 24

• Manufacturer Part Number: L80223
• Manufacturer: LSI

Specifications of L80223

• Lead Free Status / RoHS Status: Not Compliant

2.2.2.1 100BASE-TX Operation
Figure 2.3
Table 2.2
1. 1st preamble nibble transmitted.
2. 1st SFD nibble transmitted.
3. 1st data nibble transmitted.
4. D0 through D7 are the first 8 bits of the data field.
2-6
Stream
Nibble
Signals
TX_EN
TXDO
TXD1
TXD2
TXD3
TX_EN = 0
MII
IDLE
TXD0/RXD0
TXD1/RXD1
TXD2/RXD2
TXD3/RXD3
Nibble
X
X
X
X
0
First
First Bit
MII Frame Format
Transmit Preamble and SFD Bits at MAC Nibble Interface
X
X
X
X
0
LSB
PREAMBLE
PRMBLE
1
0
1
0
1
62 Bits
1
In 100BASE-TX transmit operation, data is received on the Controller
Interface from an external Ethernet controller according to the format
shown in
which scrambles the encoded data. The scrambled data is then sent to
the TP transmitter. The TP transmitter converts the encoded and
scrambled data into MLT3 ternary format, preshapes the output, and
drives the twisted-pair cable.
Functional Description
D0
1
0
1
0
1
1
0
1
0
1
PREAMBLE =
D1
Figure 2.3
1
0
1
0
1
Frame
2 Bits
DATAn =
Start
SFD
of
IDLE =
SFD =
MAC Serial Bit Stream
1
0
1
0
1
a. MII Frame Format
b. MII Nibble Order
D2
Copyright © 2000, 2001, 2002 by LSI Logic Corporation. All rights reserved.
TX_EN = 1
[ 1 0 1 0 ...] 62 Bits Long
[ 1 1 ]
[Between 64 1518 Data Bytes]
TX_EN = 0
1
0
1
0
1
DATA 1
and
1
0
1
0
1
D3
Table
Bit Value
DATA 2
1
0
1
0
1
DATA Nibbles
2.2. The data is sent to the 4B5B encoder,
D4
1
0
1
0
1
DATA N-1 DATA N
1
0
1
0
1
D5
1
0
1
0
1
1
0
1
0
1
D6
1
0
1
0
1
1
0
1
0
1
D7
TX_EN = 0
IDLE
1
0
1
0
1
2
MSB
1
0
1
1
1
Second
Nibble
D0
D1
D2
D3
1
3
D4
D5
D6
D7
1
4