PRBS – Pseudo-random binary sequence generator

Block SymbolLicensing group: STANDARD

Function Description
The PRBS block generates a pseudo-random binary sequence. The figure below displays how the sequence is generated.

The initial and final values of the sequence are val0. The sequence starts from this value when rising edge occurs at the START input (off $\to$ on), the output y is immediately switched to the valhi value. The generator then switches the output to the other limit value with the period of swper seconds and the probability of switching swprob. After seqt seconds the output is set back to val0. A waitt-second period follows to allow the settling of the controlled system response. Only then it is possible to start a new sequence. It is possible to terminate the sequence prematurely by the $BRK = on$ input when necessary.

Inputs

START	Starting signal (rising edge)	Bool
BRK	Termination signal	Bool

Outputs

y	Generated pseudo-random binary sequence	Double (F64)
BSY	Busy flag	Bool

Parameters

val0	Initial and final value	Double (F64)
valhi	Upper level of the y output $⊙$ 1.0	Double (F64)
vallo	Lower level of the y output $⊙$ -1.0	Double (F64)
swper	Period of random output switching [s] $⊙$ 1.0	Double (F64)
swprob	Probability of switching $↓$ 0.0 $↑$ 1.0 $⊙$ 0.2	Double (F64)
seqt	Length of the sequence [s] $⊙$ 10.0	Double (F64)
waitt	Settling period [s] $⊙$ 2.0	Double (F64)

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