Custom Logic

Frozen Content

Quite literally, custom logic is logic (or intelligence) that you create yourself and add in to your design. You would typically add your own custom logic into a design where the functionality required cannot be implemented using the FPGA-ready components shipped with Altium Designer.

In Altium Designer, custom logic is implemented using a hierarchical design approach, and using any combination of generic logic components, C or HDL code (VHDL or Verilog). In addition, provision of a Custom Wishbone Interface component allows you to quickly hook your custom logic into your existing bus-based system – creating your own Custom Wishbone Peripheral – without needing any knowledge of the workings of that bus system.

Figure 1. Adding custom logic through creation of hierarchical FPGA designs.

Vendor-specific FPGA primitives can also be used to provide the desired functionality, but use of such devices limits the portability of the design – locking it into a specific device family or, in some cases, specific physical FPGA device.

 

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