VHDL and Verilog Test Bench Synthesis - SynaptiCAD Inc.

Most probably, if you will be writing VHDL source code that is intended for use with more than one synthesis tool, then you will use VHDL's design management and modularity features to isolate the technology-specific statements to easily-modified sections of your design.

Equivalent of #ifdef in VHDL for simulation/synthesis separation

VHDL is a language that is used for two different purposes: simulation andsynthesis.

Introductory VHDL: From Simulation to Synthesis - …

If you have created one or more test benches as a part of your design specification, then you will use a simulator to apply the test bench to your design as it is written for synthesis (a functional simulation) and possibly using the post-synthesis version of the design as well.

Vhdl Design and Synthesis | Data Type | Subroutine

(IEEE 1076-1993 is slowly working its way into the VHDL mainstream, but does not add significant new features for synthesis users.)The VITAL initiative (VHDL Initiative Toward ASIC Libraries) is an effort to enhance VHDL's abilities for modeling timing in ASIC and FPGA design environments.


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Just as high-level programming languages allow complex design concepts to be expressed as computer programs, VHDL allows the behavior of complex electronic circuits to be captured into a design system for automatic circuit synthesis or for system simulation.

Generating VHDL for Simulation and Synthesis from a …

The VHDL source code for a parallel multiplier, using 'generate' to make the VHDL source code small is The test bench is The output of the simulation is The VHDL source code for a parallel Booth multiplier, two's complement 32-bit multiplicand by 32-bit multiplier input producing 64-bit product is The test bench is The output of the simulation is Both VHDL models use a concurrent conditional statement to model various multiplexors.

Generating VHDL for Simulation and Synthesis from a High-Level DSP ..

FPGA vendors are now offering low-cost, but powerful synthesis tools optimized for their devices, and lower-cost simulation packages are also beginning to appear.

VHDL Expert Simulation & Synthesis, Hands On Training

The condition for synchronous actions has to be the last condition of the IF structure because asynchronous control signals are usually treated with higher priority by the underlying hardware cells. An unconditional else path is strictly forbidden as statements that have to be processed whenever the active clock edge is not present do not have a physical representation. It is very important not to forget any of these asynchronous signals. Otherwise simulation will differ from synthesis results, as simulation tools base their simulation on the sensitivity list and synthesis tools usually ignore the sensitivity list completely.

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VHDL (along with other forms of entry, such as schematics and block diagrams), will be used for design entry: after being captured into a design entry system using a text editor (or via a design entry tool that generates VHDL from higher-level graphical representations), the VHDL source code can be input to simulation, allowing it to be functionally verified, or can be passed directly to synthesis tools for implementation in a specified type of device.

Introductory VHDL: From Simulation to Synthesis: …

In the meantime, the IEEE standard 1076.6 was passed that lists that the VHDL constructs that should infer register generation. As this standard is not fully supported by synthesis tools, yet, the first option is still the most common way of describing a rising/falling clock edge for synthesis. When asynchronous set or reset signals are present, only the IF variant is applicable. The RISING_EDGE function is just mentioned for sake of completeness as it is not supported by synthesis tools. Nevertheless it may be useful for simulation.