Hardware description language (HDL) layout access is
primarily based at the introduction and use of text-primarily based
descriptions of a virtual common sense circuit or machine the use of a specific
HDL (the 2 IEEE standards in commonplace use are Verilog®-HDL and VHDL).
From: Digital Systems Design with FPGAs and CPLDs, 2008
Related phrases:
Sarah L. Harris, David Harris, in Digital Design and Computer Architecture, 2022
four.10 Summary
Hardware description languages (HDLs) are extraordinarily essential tools for current virtual designers. Once you've got learned SystemVerilog or VHDL, you will be capable of specify virtual structures plenty faster than in case you had to draw the whole schematics.
The debug cycle is likewise frequently a whole lot faster due to the fact modifications require code adjustments rather than tedious schematic rewiring. However, the debug cycle may be plenty longer the usage of HDLs in case you don’t have a good concept of the hardware your code implies.
HDLs are used for each simulation and synthesis. Logic simulation is a powerful way to test a machine on a laptop before it's far become hardware. Simulators let you test the values of signals interior your device that is probably not possible to degree on a physical piece of hardware. Logic synthesis converts the HDL code into digital good judgment circuits.
The maximum vital component to keep in mind while you are writing HDL code is that you are describing actual hardware, now not writing a computer software. The maximum not unusual amateur’s mistake is to write HDL code with out considering the hardware you must produce. If you don’t understand what hardware you are implying, you're nearly sure no longer going to get what you need.
Instead, start by means of sketching a block diagram of your machine, figuring out which portions are combinational common sense, which quantities are sequential circuits or finite kingdom machines, and so forth. Then, write HDL code for every element, using the suitable idioms to mean the type of hardware you want.
R.C. Cofer, Benjamin F. Harding, in Rapid System Prototyping with FPGAs, 2006
7.Three.1 Dual Nature of HDL Languages
HDL languages may be used for each layout implementation and design simulation. It is crucial to remember that sure HDL systems, and code constructs that may be used to simulate a design won't be able to be translated into physical hardware. A outcome of the dual-nature of HDL languages is that a design described by “compilable” HDL code isn't guaranteed to be synthesizable right into a layout that can be located in a focused FPGA.
The fashion designer ought to be privy to the particular structures and constructs that can be used to generate hardware. Designers must additionally be able to implement the systems required for efficient design simulation. This is in all likelihood the finest mission related to HDL-based design. Figure 7.7 illustrates the twin nature of VHDL and Verilog.
Ian Grout, in Digital Systems Design with FPGAs and CPLDs, 2008
6.Three.3 HDL Design Entry
Hardware description language (HDL) design access is primarily based at the creation and use of textual content-primarily based descriptions of a digital good judgment circuit or machine the usage of a selected HDL (the two IEEE requirements in commonplace use are Verilog®-HDL and VHDL). It is commonplace to adopt a hierarchical design technique to maintain a mission achievable. The HDL code is written to conform to one in all 3 styles:
A structural description describes the circuit structure in terms of the logic gates used and the interconnect wiring among the logic gates to shape a circuit netlist read more :- healthfitnesshouse