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E.6.2 Duality of types: SystemVerilog types vs. C types

发布于 2020-09-09 22:56:14 字数 951 浏览 1015 评论 0 收藏 0

A value that crosses the Direct Programming Interface is specified in SystemVerilog code as a value of SystemVerilog type, while the same value shall be specified in C code as a value of C type. Therefore, each data type that is passed through the Direct Programming Interface requires two matching type definitions: the SystemVerilog definition and C definition.

The user needs to provide such matching definitions. Specifically, for each SystemVerilog type used in the import declarations or export declarations in SystemVerilog code, the user shall provide the equivalent type definition in C reflecting the argument passing mode for the particular type of SystemVerilog value and the direction (input, output, or inout) of the formal SystemVerilog argument. For values passed by reference, a generic pointer void * can be used (conveniently typedefed in svdpi.h or svdpi_src.h) without knowing the actual representation of the value.

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