Structure specification with a procedural hardware description language
F.J. Hill, Rowena Swanson, Md. Raihan Masud, Zainalabedin Navabi · IEEE Transactions on Computers · 1981
Describes the extension and formalization of the hardware description language AHPI to form AHPL III. This language provides for nesting AHPL descriptions within descriptions. It incorporates a general index extension mechanism which permits the efficient representation of sets of duplicate descriptions of any complexity. Three types of structures, procedural structures, functional registers, and combinational logic units are permitted. Procedural structures may be primitive or nonprimitive. All but primitive procedural structures share a common syntax. Nesting, declaration, and invocation rules for these distinct structures are specified in a semantics table.