Data Types VHDL

• In order to write VHDL code efficiently it is necessary to study the specification and use of data types.

• Following are the categories of data types:
– Pre-defined
– User defined
– Subtypes
– Arrays
– Port arrays
– Records
– Signed and unsigned

Pre-defined data types

• Specified by IEEE 1076 and IEEE 1164





• To assign a value to the signal use the operator “ < = ”

• Assignment examples:









• Other types



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