IRVS VLSI IDEA INNOVATORS

IRVS VLSI IDEA INNOVATORS
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Monday, September 20, 2010

Designs of VHDL

Design Hierarchy

• Hierarchy can be represented using VHDL.

• Example
– A full adder which is the top level module being composed of three lower level modules that are; half adder and OR gate.



Note: Design hierarchy simplifies the design procedure and manageability in case of complex designs.

Design Libraries

• Design Unit
– It is any block of VHDL code or collection of VHDL codes that may be independently analyzed and inserted into a design library.

• Design Library.
– It is a storage facility in which analysed VHDL descriptions are stored for repeated uses.




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