History of VHDL

VHDL was originally developed at the request of the Department of Defense (United States) to document the behavior of subcontracting companies ASIC that were included in the team. Actually VHDL was developed as an alternative to large, complex manuals which were subject to specify details of implementation.

The thought that one would be able to replicate such type of document was way much attractive, as the though that such type of simulators would be able to read the VHDL files have attracted hundreds of designers, as it would help them to minimize their task. However the next step to achieve such task was that to make the mixture of different types of tools that they would be able to read the VHDL and would be able to give an output that would be able to implement the whole circuit physically.

Because of the Department of Defense that require both the syntax as possible on the basis of Ada, to avoid reinventing other concepts that were already completely tested in the development of ADA. VHDL is largely based on the ADA, as it has adopted the syntax as well as the concept of the ADA language, which allows the user of this language to take the full command on VHDL without that much of experience.

The very first version of VHDL was specially designed in a way that it would match the standards of IEEE, as it consists of a great number of data types that includes real as well as integer, Logical etc. Moreover the positive arrays were called as bit while the characters or alphanumeric characters were known to be the string characters.

Later on many updates and upgrades were added in VHDL simulator to make it 100% compatible with VHDL language however to this date VHDL simulator is known to be the most perfect and the most compatible VHDL simulator for VHDL language as it minimizes the task of a designer to a large extinct.