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Shift Register Generator
DG2040 Data Generator
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Operation.
Do the following to generate a clock pattern.
Bottom button
Pop up menu
Enhanced Action
Clock Pattern
Set the parameters in the pop up menu. (Low Data, High Data, Dest Bit, From, Size)
This Enhanced Action menu function sets up the configuration for the pseudo-
random pulse generator that uses a shift register.
The shift register pseudo-random pulse generator consists of a register that is
between 1 and 32 bits and a feedback loop. This feedback loop takes the value
that is shifted out of the register, performs the exclusive OR with one or more
bits within the register, and places the result in the first bit of the register. The
position at which an exclusive OR is set is called a tap, and certain tap configura-
tions produce series that are the longest possible. The data generated by such a
configuration is called an M-series. If the number of stages in the shift register is
n, then an M-series pseudo-random signal will have a length of 2
Create a simple register and tap setup as follows:
H Register length: 3
H Register value: 101
H Set the tap with the Maximum Length Taps item.
Figure 3-44 shows the output for the above settings.
Register Length
Î Î Î Î Î Î Î Î
1
0
1
Î Î Î Î Î Î Î Î
Î Î Î Î Î Î Î Î
Tap
Figure 3 44: Register value and tap setting example
Side button
OK
Region (Select All or
Entered)
Start (Select Low or
High)
OK
Output
One Period
1
0
1
1
1
0
Reference
n
–1.
0
1
0
3 47
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