Variable vs. Signal on indexing - FPGA Groups
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well supported by Simulation and Synthesis CAD tools VHDL is …
The separate clock input and output signals are referenced to different bits of a signal vector using the variable called index.VHDL generate for loop:Verilog generate for loop:Now you might ask why you would want to write the same code segment multiple times so here are a couple of examples where you would want to use the generate for loop:
vhdl • View topic • Variable vs. Signal on indexing
VHDL stands for VHSIC (Very High SpeedIntegrated Circuits) Hardware Description Language. In themid-1980’s the U.S. Department of Defense and the IEEE sponsored thedevelopment of this hardware description language with the goal to develop veryhigh-speed integrated circuit. It has become now one of industry’s standardlanguages used to describe digital systems. The other widely used hardwaredescription language is Verilog. Both are powerful languages that allow you todescribe and simulate complex digital systems.A third HDL language is ABEL (Advanced Boolean Equation Language) whichwas specifically designed for Programmable Logic Devices (PLD). ABEL is lesspowerful than the other two languages and is less popular in industry. Thistutorial deals with VHDL, as described by the IEEE standard 1076-1993.
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AD9910 Datasheet and Product Info | Analog Devices
The Synopsys Synthesis Example illustrates that the RTL synthesis is moreefficient than the behavior synthesis, although the simulation of previousone requires a few clock cycles.
Digital electronics - Wikipedia
The aim of this book continues to be the introduction of the VHDL language to the reader at the beginner's level. VHDL is a large and verbose language with many complex constructs that have complex semantic meanings and is initially difficult to understand (the US military requires VHDL for device designs, thus explains its popularity vs. other HDLs). The book presents a subset of VHDL consisting of commonly used features that make it both simple and easy to use.