Selector Block

Selects one of multiple input signals based on an index. The index input determines which input is routed to the output.

# Selector

Selects one of multiple input signals based on an index value.

Parameters

| Parameter | Type | Default | Description | | --------- | ------ | ------- | ----------------------------------- | | numInputs | number | 2 | Number of data inputs (2-10) | | indexBase | select | 1 | Whether index is 0-based or 1-based |

Ports

• Idx (input): Index selecting which input to route (clamped to valid range)
• In1, In2, ... (inputs): Data input signals
• Out (output): The selected input signal

Behaviour

• The idx input selects which data input is routed to the output
• With indexBase = 1: idx=1 selects in1, idx=2 selects in2, etc.
• With indexBase = 0: idx=0 selects in1, idx=1 selects in2, etc.
• The index is rounded to the nearest integer and clamped to the valid range
• If no matching input is found, outputs 0.0

Remarks

• Index clamping: The index input is rounded to the nearest integer and clamped to [1, numInputs] (or [0, numInputs-1] in 0-based mode); out-of-range indices always produce a valid output
• 0-based vs 1-based: Use indexBase = 0 when the index comes from another block that outputs zero-based indices (e.g., a counter starting at 0)
• Dynamic selection: The index can be a time-varying signal, allowing the selector to dynamically switch between inputs during simulation
• Unconnected inputs: If a selected data input is not connected, the output is 0.0
• Performance: Minimal overhead — index clamping and selection happen in a single step