In 2008, Accellera released VHDL 4.0 to the IEEE for balloting for inclusion in IEEE 1076-2008. The VHDL standard IEEE 1076-2008 was published in January 2009.
Currently, IEEE 1076-2008 is the latest version of VHDL.
implement vhdl code for counter.output of counter pulse is a square wave
VHDL program follows IEEE library. This means that all the data types, commands, keywords etc. used in a VHDL program are stored in a library called IEEE library. This library will be available in the EDA tool which is executing the VHDL program. 1164 is a package where all the logic gates are defined. This is a sub part of IEEE library. As encoder program requires logic gates, we need to use 1164 package in the code.
In the synthesis part of a VHDL code, the EDA tool provides technology schematic. It describes the structure and sub-structures of the design. We can watch our design from the system level to the gate level.
VHDL is basically a hardware description language. To describe hardware as a program that can be dumped into a PLD, we use VHDL. It is essential to represent hardware as program so that it can be tested before realizing it physically. If there are any errors, they can be corrected here itself.
John Hines, Wright Patterson AFB, Daton Ohio
In 2008, Accellera released VHDL 4.0 to the IEEE for balloting for inclusion in IEEE 1076-2008. The VHDL standard IEEE 1076-2008 was published in January 2009. Currently, IEEE 1076-2008 is the latest version of VHDL.
The first publicly available VHDL version was VHDL 7.2. It was released in the year 1985. The proposal for standardization was first kept in front of Institute of Electrical and Electronics Engineering Inc. (IEEE) in 1986. Several enhancements and modifications were made to the VHDL 7.2 version by IEEE. This was done by a team of commercial, government and academic representatives. Then they released the first IEEE standard version of VHDL. It was IEEE 1076-1987. It was released in 1987. From then, IEEE is releasing several versions.
VHDL is not any software. It is a programming language. One should learn how to program using VHDL. The supporting software tools may be downloaded from some of the EDA Tools providers on trial basis. Aldec is providing the student version for free.
VHDL is a hardware description language. XILINX is an EDA tool. EDA tools, electronic design and automation tools, are used to implement the programs like VHDL or Verilog. VHDL has several versions. But all these are standardized by IEEE and they don't belong to XILINX. Several FPGAs and CPLDs are manufactured by XILINX.
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