Shift Register Generator - Tektronix DG2030 User Manual

Shift Register Generator

DG2030 User Manual
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Operation. Generate a clock pattern
Bottom button Popup menu
Enhanced Action Clock Pattern
Set the parameters in the popup menu. (Low Data, High Data, Dest Bit, From, Size)
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 with
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 3-39 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
Î Î Î Î Î Î Î Î
Tap
Figure 3 39: 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
Edit Menu
n
–1.
0 1 0
3 45