LXT974/LXT975 — Fast Ethernet 10/100 Quad Transceivers
Table 19. 4B/5B Coding
4B Code
3 2 1 0
5B Code
4 3 2 1 0
Code Type
Name
Interpretation
0 0 0 0
0 0 0 1
0
1 1 1 1 0
0 1 0 0 1
1 0 1 0 0
1 0 1 0 1
0 1 0 1 0
0 1 0 1 1
0 1 1 1 0
0 1 1 1 1
1 0 0 1 0
1 0 0 1 1
1 0 1 1 0
1 0 1 1 1
1 1 0 1 0
1 1 0 1 1
1 1 1 0 0
1 1 1 0 1
1 1 1 11
1 1 0 0 0
1 0 0 0 1
0 1 1 0 1
0 0 1 1 1
0 0 1 0 0
0 0 0 0 0
0 0 0 0 1
0 0 0 1 0
0 0 0 1 1
0 0 1 0 1
0 0 1 1 0
0 1 0 0 0
0 1 1 0 0
1 0 0 0 0
1 1 0 0 1
Data 0
Data 1
Data 2
Data 3
Data 4
Data 5
Data 6
Data 7
Data 8
Data 9
Data A
Data B
Data C
Data D
Data E
Data F
1
0 0 1 0
2
0 0 1 1
3
4
0 1 0 0
0 1 0 1
5
0 1 1 0
6
DATA
0 1 1 1
7
1 0 0 0
8
1 0 0 1
9
1 0 1 0
A
1 0 1 1
B
1 1 0 0
C
1 1 0 1
D
1 1 1 0
E
1 1 1 1
F
IDLE
undefined
0 1 0 1
I 1
Idle. Used as inter-stream fill code
J 2
Start-of-Stream Delimiter (SSD), part 1 of 2
CONTROL
0 1 0 1
K 2
Start-of-Stream Delimiter (SSD), part 2 of 2
undefined
undefined
undefined
undefined
undefined
undefined
undefined
undefined
undefined
undefined
undefined
undefined
undefined
T 3
End-of-Stream Delimiter (ESD), part 1 of 2
R 3
End-of-Stream Delimiter (ESD), part 2 of 2
H 4
Transmit Error. Used to force signaling errors
Invalid
Invalid
Invalid
Invalid
Invalid
Invalid
Invalid
Invalid
Invalid
Invalid
Invalid
Invalid
Invalid
Invalid
Invalid
Invalid
Invalid
Invalid
Invalid
Invalid
INVALID
1. The /I/ (Idle) code group is sent continuously between frames.
2. The /J/ and /K/ (SSD) code groups are always sent in pairs; /K/ follows /J/.
3. The /T/ and /R/ (ESD) code groups are always sent in pairs; /R/ follows /T/.
4. An /H/ (Error) code group is used to signal an error condition.
32
Datasheet
INTEL [ INTEL ]
