OpenCL* Library Design Example

OpenCL* Library feature allows including modules written in Register Transfer Level (RTL) languages, such as VHDL and Verilog, into OpenCL* kernels. One or more such RTL modules are packaged into an “OpenCL* library” object, which is then passed to aoc as if it were a software library. For more information about OpenCL* Library feature, see Intel® FPGA SDK for OpenCL* Programming Guide.

Two examples are provided here. The first one contains RTL cores that do not access external memory. This is the preferred way to create OpenCL* Library components, as it is easier to design and debug than modules that need to talk to external memory directly.

The second example contains an RTL module that requires Avalon Memory Mapped interface to access DDR directly. 


The design example provides source code for the OpenCL* device (.cl) as well as the host application. For compiling the host application, the Linux package includes a Makefile and the Windows package includes a Microsoft Visual Studio 2010 project.

The following downloads are provided for this example:


The use of this design is governed by, and subject to, the terms and conditions of the Altera® hardware reference design license agreement.

Software and Hardware Requirements

This design example requires the following tools:

  • Intel® FPGA Software v16.1 or later
  • Intel FPGA SDK for OpenCL* v16.1 or later
  • On Linux: GNU Make and gcc
  • On Windows: Microsoft Visual Studio 2010

To download the Intel FPGA tools, visit the OpenCL* download page. The requirements for the underlying operating system are the same as those of the Intel FPGA SDK for OpenCL*.

The use of this design is governed by, and subject to, the terms and conditions of the Altera hardware reference design license agreement.

OpenCL* and the OpenCL* logo are trademarks of Apple Inc. used by permission by Khronos.

* Product is based on a published Khronos Specification, and has passed the Khronos Conformance Testing Process. Current conformance status can be found at

Design Examples Disclaimer

These design examples may only be used within Altera Corporation devices and remain the property of Altera. They are being provided on an “as-is” basis and as an accommodation; therefore, all warranties, representations, or guarantees of any kind (whether express, implied, or statutory) including, without limitation, warranties of merchantability, non-infringement, or fitness for a particular purpose, are specifically disclaimed. Altera expressly does not recommend, suggest, or require that these examples be used in combination with any other product not provided by Altera.