FWLXT9785BC.A4 Intel, FWLXT9785BC.A4 Datasheet - Page 146

• Manufacturer Part Number: FWLXT9785BC.A4
• Manufacturer: Intel

Specifications of FWLXT9785BC.A4

• Lead Free Status / RoHS Status: Not Compliant

146
LXT9785 and LXT9785E Advanced 8-Port 10/100 Mbps PHY Transceivers
4.9.3
Table 46. 4B/5B Coding
PMA Sublayer
The 100BASE-X PMA protocol uses the 4B/5B data encoding scheme to encode/decode the data
streams. The coding scheme is shown in
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.
Code Type
CONTROL
INVALID
DATA
IDLE
undefined
undefined
undefined
undefined
undefined
undefined
undefined
undefined
undefined
undefined
undefined
undefined
undefined
undefined
4B Code
3 2 1 0
0 0 0 0
0 0 0 1
0 0 1 0
0 0 1 1
0 1 0 0
0 1 0 1
0 1 1 0
0 1 1 1
1 0 0 0
1 0 0 1
1 0 1 0
1 0 1 1
1 1 0 0
1 1 0 1
1 1 1 0
1 1 1 1
0 1 0 1
0 1 0 1
Invalid
Invalid
Invalid
Invalid
Invalid
Invalid
Invalid
Invalid
Invalid
Invalid
Name
K
R
H
T
J
I
A
B
C
D
E
0
1
2
3
4
5
6
7
8
9
F
1
2
2
3
3
4
Table
46.
5B Code
4 3 2 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 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
1 1 1 11
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
Idle. Used as inter stream fill code.
Start-of-Stream Delimiter (SSD),
part 1 of 2.
Start-of-Stream Delimiter (SSD),
part 2 of 2.
End-of-Stream Delimiter (ESD),
part 1 of 2.
End-of-Stream Delimiter (ESD),
part 2 of 2.
Transmit Error. Used to force
signaling errors.
Invalid
Invalid
Invalid
Invalid
Invalid
Invalid
Invalid
Invalid
Invalid
Invalid
Interpretation
Revision Date: 30-May-2006
Document Number: 249241
Revision Number: 010
Datasheet