Integrating OpenCL .cl files with RTL - Avalon required? Defining clocks, etc

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The official documentation for integrating RTL with OpenCL is in "Intel FPGA SDK for OpenCL Programming Guide, 11.1 OpenCL Library". Using Avalon is mandatory for this purpose. The RTL module will have the same clock as the OpenCL kernel, which does not need to be set by the user.

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Much thanks HRZ - apologies, I didn't realise it was in that documentation - I've read it already but must have missed that section somehow.