Configure Scalar Argument Interface

Syntax

#pragma HLS interface argument(<arg_name>) type(simple) stable(<false|true>)

Description

This pragma configures the scalar input port. The stable option informs SmartHLS that the port can be held valid and unchanged throughout the whole iteration of the execution and potentially can save register usage in the generated module. Note that the type option is not configurable in the current release but still needs to be specified if you wish to add the stable option. If ‘stable’ is false, the pragma is not necessary because SmartHLS assumes not stable by default. More details in Top-Level RTL Interface section.

Parameters

Parameter	Type	Optional	Default	Description
argument	String	No		Argument name
type	simple	No		Interface type
stable	true|false	Yes	false	true if the argument is stable

Position

At the beginning of the function definition block.

Examples

int fun(int a) {
#pragma HLS interface argument(a) type(simple) stable(true)
  ...
}

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