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Connect signals attached to LEDs on hardware board

  • Library:
  • SoC Blockset / Hardware Logic I/O

  • LED block


The LED block indicates the status of a signal. The hardware logic signals connected to an LED block are equivalent to the signals connected to the light emitting diodes (LED) on the hardware board.



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Input signal from the hardware logic. Each LED has a port, named LED1 to LEDx, where x is Number of LEDs.

Data Types: Boolean


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This parameter is read-only. To choose a hardware board and configure board parameters, see Hardware Implementation Pane.

To view a diagram of the location of the LEDs on the selected hardware board, click the View LEDs location button.

This button is enabled only when you select specific Xilinx or Intel boards. For more information about these boards, refer to Supported Third-Party Tools and Hardware.

This parameter is read-only. Indicates the IO logic level on the selected hardware board.

When the IO logic parameter is shown as Active Low, the LED block accepts active low signals and represents the port names prefixed with letter n. For example, nLED1.

Specify the required number of LED ports by specifying a value from this list. n is the number of available LEDs on the specified hardware board. For example, if you set this parameter to 4, the block shows four LED ports.

To use only the nth LED, set the Number of LEDs parameter to n and leave the unused LED ports unconnected.

For the Zynq® UltraScale+™ RFSoC ZCU216 Evaluation Kit, the first three LED ports represent the first set of red, green, and blue (RGB) LEDs out of the eight available sets, the next three LED ports represent the second set of RGB LEDs, and so on. For example, if you set the Number of LEDs parameter to 9, the LED1, LED4, and LED7 ports connect to the red LEDs, the LED2, LED5, and LED8 ports connect to the green LEDs, and the LED3, LED6, and LED9 ports connect to the blue LEDs on the ZCU216 evaluation board.

Model Examples

Extended Capabilities

Fixed-Point Conversion
Design and simulate fixed-point systems using Fixed-Point Designer™.

Version History

Introduced in R2019a