FWLXT9785BC Cortina Systems Inc, FWLXT9785BC Datasheet - Page 143

• Manufacturer Part Number: FWLXT9785BC
• Manufacturer: Cortina Systems Inc

Specifications of FWLXT9785BC

• Lead Free Status / RoHS Status: Not Compliant

LXT9785/LXT9785E
Datasheet
249241, Revision 11.0
16 April 2007
Table 46
4.9.3.1
Cortina Systems
4B/5B Coding
Link
In 100 Mbps mode, the LXT9785/LXT9785E establishes a link whenever the descrambler
becomes locked and remains locked for approximately 50 ms. Whenever the descrambler
loses lock (<16 consecutive idle symbols during a 2 ms window), the link is taken down.
This provides a robust link, filtering out any small noise hits that may otherwise disrupt the
link. Furthermore, 100 Mbps idle patterns will not bring up a 10 Mbps link.
®
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.
LXT9785 and LXT9785E Advanced 8-Port 10/100 Mbps PHY Transceivers
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 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
Name
Invalid
Invalid
Invalid
Invalid
Invalid
Invalid
Invalid
Invalid
Invalid
Invalid
K
R
H
J
T
I
A
B
C
D
E
6
7
8
9
F
1
2
3
2
3
4
4 3 2 1 0
5B Code
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 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
4.9 100 Mbps Operation
Interpretation
Page 143