Anritsu MP2110A BERTWave - Page 177

5.2 PPG/ED Panel
5-11
5
How to Operate BERT
PRBS
Pattern
Generation
Polynomial
Pattern
Length
Maximum
number of
contiguous 1s
Maximum
number of
contiguous 0
2^7–1 1+X
6
+X
7
127 7 6
2^9–1 1+X
5
+X
9
511 9 8
2^15–1 1+X
14
+X
15
32767 15 14
2^23–1 1+X
18
+X
23
8388607 23 22
2^31–1 1+X
28
+X
31
214748647 31 30
The ratio of 1s to the PRBS pattern length is 50%.
1/2 Clock Pattern
“1/2 Clock Pattern” means the repeating pattern of “1” and “0”.
The pattern of which the clock frequency is divided in half is output from
the
Data Out
connector and
Data
Out
connector.
Figure 5.2.3-2 Relationship between Data and Clock when 1/2 Clock
Pattern is set
1/16 Clock Pattern
“1/16 Clock Pattern” means the repeating pattern of “11111111” and
“00000000”.
The pattern of which the clock frequency is divided in one-sixteen is
output from the
Data Out
connector and
Data
Out
connector.
Figure 5.2.3-3 Relationship between Data and Clock when 1/16 Clock
Pattern is set
Clock
Data
1101 0 1 0
1 0 0
Pattern
data
Time
Clock
Data
1 1 0 0 0 0 0 0 0 0 1 1 1 1 1 1 1 1 0 0 0
Pattern
data
Time