Operator PeriodToSignal

Operator Library: Signal

The operator generates a periodic signal at its output. The period time is controlled by the pixel value at the input link I. Thus the operator converts the input stream values into a signal with the period provided by the pixel values. The high time of the output pulses is one tick.

During processing of a current signal generation with a specified period, the operator will ignore any new values at the input. After the processing of a period is finished, the generates a new period with the length of the last valid input pixel value. The pulse position can either be at the beginning or at the end of a period and is controlled using parameter PulsePosition. In the following figure, the operator's behavior is illustrated.

The next figure shows the generation of the pulse at the start of a period.

The period time is measured in Ticks being high. Tick is a signal input and can be used like a prescaler. For every high value at the Tick input, the period time is counted. The following waveform shows the behavior of the Tick input to the period generation. In most cases, the Tick input is not required. Tie it to operator VCC in this case.

The Reset input link is used to reset the operator. This is useful if a long period or sequence has to be cancelled. In the next figure, the reset usage is illustrated.

This operator is excluded from the VisualApplets functional simulation.

I/O Properties

Property Value
Operator Type M
Input Links I, pixel data input
Tick, signal input
Reset, signal input
Output Link O, signal input

Synchronous and Asynchronous Inputs

  • All signal inputs may be sourced by the same or different M-type operators through an arbitrary network of O-type operators. If they are sourced by the same M-type source, they will be automatically synchronized.
  • Input link I is asynchronous to the signal inputs.

Supported Link Format

Link Parameter Input Link I Input Link Tick Input Link Reset Output Link O
Bit Width [1, 64] 1 1 1
Arithmetic unsigned unsigned unsigned unsigned
Parallelism 1 1 1 1
Kernel Columns 1 1 1 1
Kernel Rows 1 1 1 1
Img Protocol {VALT_IMAGE2D, VALT_LINE1D, VALT_PIXEL0D} VALT_SIGNAL VALT_SIGNAL VALT_SIGNAL
Color Format VAF_GRAY VAF_GRAY VAF_GRAY VAF_GRAY
Color Flavor FL_NONE FL_NONE FL_NONE FL_NONE
Max. Img Width any any any any
Max. Img Height any any any any

Parameters

PulsePosition
Type static parameter
Default AtPeriodEnd
Range {AtPeriodStart, AtPeriodEnd}

The output pulse can either be at the start of each period or at the end of each period.

Examples of Use

The use of operator PeriodToSignal is shown in the following examples:

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