Intel® High Level Synthesis Compiler Pro Edition: Reference Manual

ID 683349
Date 10/04/2021

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Document Table of Contents HLS Emulation Models for RTL-Based Functions

For an RTL-based function, write C++ code that serves as an emulation model for that function. This model is used when you run your component in emulation mode.

The emulation model is not used when you simulate your component; simulations use RTL extracted from the library.


If your function uses static variables to hold internal state, the emulation is equivalent to the RTL functionality only if the function is called from only one place in the HLS component.

This behavior is different because on CPUs all calls to the function share the same state variables. On FPGAs, the RTL module is instantiated once for each location in the HLS component where the function is called, and these instances do no share state.