8B/10B Coding 64B/66B Coding - Nikhef
[Pages:29]8B/10B Coding 64B/66B Coding
1. Transmission Systems 2. 8B/10B Coding 3. 64B/66B Coding 4. CIP Demonstrator Test Setup
Sep 4, 2008
PeterJ Slide 1
Transmission system General
Data Clock
D
Q
Flip Flop
C
@ 1 Gbps = 1 ns = 20 cm
Sep 4, 2008
PeterJ Slide 2
Data Clock
Transmission system Propagation Delay
D
Q
Flip Flop
C
Unequal propagation delay
10 cm @ 1 Gbps
????
Sep 4, 2008
PeterJ Slide 3
Transmission system Clock Data Recovery
Data
Clock
Combine Clock and Data!
If there are enough edges in the data then the clock can be recovered from the data using a PLL
CDR
PLL
D
Q
Flip Flop
C
PLL
Sep 4, 2008
PeterJ Slide 4
Code Properties
1. Provide enough edges in the data to enable Clock Recovery
Sep 4, 2008
PeterJ Slide 5
Transmission system Receiver Threshold
Data Clock
CDR
D
Q
Flip Flop
C
Receiver Threshold refers to "Ground" which must be the same potential as "Ground" at
the transmitter!
Jitter!
Sep 4, 2008
PeterJ Slide 6
Data Clock
Transmission
Use Differential signalling!
CDR Icm
D
Q
Flip Flop
C
Receiver Threshold is halfway positive and negative signal
CommUosnemAoCdeCvooulptaligneg dCiaffpearecnitcoersb...etween transmitter anNdeterdmDinCatBioanlaantcthee! receiver can
result in excessive currents
Sep 4, 2008
PeterJ Slide 7
DC Balance
10 10 1
10 10 1
11 11 1
11 1?0
Define a maximum Run Length Sent equal amount of `1's and `0's (Running Disparity)
Sep 4, 2008
PeterJ Slide 8
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