Behavioral Description Language

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Behavioral Description Language (BDL) is a programming language based on ANSI C with extensions for hardware description, developed to describe hardware at levels ranging from the algorithm level to the functional level.

Although the term Behavioral Description Language is a generic term and can refer to multiple high level description languages, NEC Corporation has developed a C-subset called BDL for High Level Synthesis. This C-subset includes its own data types (called var-class), special constants for hardware design e.g. high impedance, timing descriptors and control statements.

As BDL is meant for Hardware synthesis, the complete ANSI-C syntax is not supported. The principal unsupported operations are: (i) Floating point data types (ii) Sizeof operator (iii) unions and (iv) Recursive functions.

BDL is sometimes also known as Cyber C because it is synthesized using NEC's High Level Synthesis tool called CyberWorkBench [1].


  • Wakabayashi, K.; Okamoto, T. (2006). "C-based SoC design flow and EDA tools: an ASIC and system vendor perspective". Trans. Comp.-Aided Des. Integ. Cir. Sys. 19 (12): 1507–1522. doi:10.1109/43.898829. 

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