VHDL stands
for Very High speed integrated circuits Hardware Description Language. It was
funded by the US Department of Defense in the 70’s and 80’s. It was
established as IEEE standard IEEE 1076 in 1987. It was later updated on 1993, 2002
and 2008. Today VHDL
is widely used across the industry for design description, simulation and
synthesis purpose.
Here
General Structure of VHDL Program is given below
·
Library
Declaration
·
Package
Declaration
·
User
Defined Library Declaration*
·
User
Defined Package Declaration*
·
Entity
Declaration
o
Generic
Declaration
o
Port
Declaration
·
Architecture
Declaration
·
Configuration
Declaration