Designers face the challenge of specifying and implementing complicated mixed-technology systems. In order to better address mixed-signal designs, the VHDL-AMS and Verilog-AMS languages have been developed. These languages provide powerful capabilities to model and simulate behaviors in both the continuous and discrete time domains. Contemporaneously, the control systems community developed the...

One of the major problems within the VHDL based behavioral synthesis is to start the design on higher abstraction level than the register transfer level (RTL). VHDL semantics was designed strictly for simulation, therefore it was not considered as high-level synthesis language. A novel synthesis procedure was developed, which uses the methodology of high level synthesis. It starts from an abstr...

Goossens defined a structural operational semantics for a subset of VHDL-87 and proved that the parallelism present in VHDL is benign. We extend this work to include VHDL-93 features such as shared variables and postponed processes that change the underlying semantic model. In the presence of shared variables, non-deterministic execution of VHDL-93 processes destroys the unique meaning property...

The VHDL language is considered to be an important standard among the hardware description tools. Most of the existing loop optimization techniques that consider the parallelism inherent to multi-dimensional problems depend on loop transformations not available in the current VHDL Synthesis products. This study presents a coding technique on modeling multi-dimensional (nested) loops on VHDL, wh...

This paper deals with a declarative interface for VHDL in general and the use of such an interface for OBDD based verification of VHDL gate level designs in particular. It presents a solution that enables OBDD verification without external manipulation of the netlist which is well integrated into the standard VHDL environment. The information required for OBDD based VHDL verification, existing ...

This paper presents a new platform for VHDL visualization to support undergraduates in learning this hardware description language. The presented platform, denoted as VISUAL-VHDL, enables students to enter their own VHDL code and control an animation process, which shows step-by-step how the different language constructs are treated to synthesize a complete digital circuit. Furthermore, VISUAL-...

This tutorial paper gives a functional semantics for delta delay VHDL i e VHDL restricted to zero delay signal assignments In combination with the sequential state ments zero delay signal assignment is su cient to generate the full algorithmic ex pressibility of VHDL The restriction is useful for a formal semantics of VHDL aimed at higher levels of abstraction where real absolute and precise ti...