Unit Delay External IC (Obsolete)
Delay signal one sample period, with external initial condition
The Unit Delay External IC block is not recommended. This block was removed from the Discrete library in R2016b. In new models, use the Delay block (with parameters set appropriately). Existing models that contain the Unit Delay External IC block continue to work for backward compatibility.
Additional Math & Discrete / Additional Discrete (until R2016b)
The Unit Delay External IC block delays its input by one sample period. This block is equivalent to the z-1 discrete-time operator. The block accepts one input and generates one output, both of which can be scalar or vector. If the input is a vector, all elements of the vector are delayed by the same sample period.
The block's output for the first sample period is equal to the signal
You specify the time between samples with the Sample time
parameter. A setting of
-1 means that the block inherits the
Data Type Support
The Unit Delay External IC block accepts signals of the following data types:
The data types of the inputs
IC must be
the same. The output has the same data type as
For more information, see Data Types Supported by Simulink in the Simulink® documentation.
- Sample time
Specify the time interval between samples. To inherit the sample time, set this parameter to
-1. See Specify Sample Time in the online documentation for more information.
Double | Single | Boolean | Base Integer | Fixed-Point
Specified in the Sample time parameter
No, of the input port
Yes, of the external
Unit Delay, Unit Delay Enabled (Obsolete), Unit Delay Enabled External IC (Obsolete), Unit Delay Enabled Resettable (Obsolete), Unit Delay Enabled Resettable External IC (Obsolete), Unit Delay Resettable (Obsolete), Unit Delay Resettable External IC (Obsolete), Unit Delay With Preview Enabled (Obsolete), Unit Delay With Preview Enabled Resettable (Obsolete), Unit Delay With Preview Enabled Resettable External RV (Obsolete), Unit Delay With Preview Resettable (Obsolete), Unit Delay With Preview Resettable External RV (Obsolete)
Introduced before R2006a