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Appending Xilinx Libraries

When working with FPGAs, you may sometimes need to use libraries provided by the vendor. SCode provides methods to include and use Xilinx libraries.

If you need to use a library component that is not already defined in SCode’s built-in xilinx_lib.sh, there are two ways to add it:

  1. Modify xilinx_lib.sh: You can edit the file directly, following the pattern of existing definitions.
  2. Add via functions in your code: Use the xilinx_unisim_lib_append or xilinx_unimacro_lib_append functions directly in your SCode logic.

To use the second method, you need to provide the I/O information for the library component. The function parameters are as follows:

xilinx_unisim_lib_append(name, i, o, io=[], generic={})
xilinx_unimacro_lib_append(name, i, o, io=[], generic={})

Pass the library component name as a string, and the input (i) and output (o) pin names as lists. If there are inout (io) pins, provide them as a list; otherwise, this can be omitted. Generics can be provided as a dictionary and are also optional.

For example, the following code adds the IBUFGDS_DIFF_OUT component, which takes a differential input and produces a differential output:

xilinx_unisim_lib_append('IBUFGDS_DIFF_OUT', ['I', 'IB'], ['O', 'OB'])

Since there are no inout pins or generics required for this component, those parameters are omitted. Once added, you can instantiate the component as follows:

IBUFGDS_DIFF_OUT(I=I, IB=IB, O=O, OB=OB)

The resulting converted VHDL code will look like this:

u0_IBUFGDS_DIFF_OUT : IBUFGDS_DIFF_OUT port map (
    I                   => I,
    IB                  => IB,
    O                   => O,
    OB                  => OB
);
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