Deprecated IEEE Packages and Non-Standard Packages

Some packages are widely spread but were never standardized by IEEE. Different vendors have shipped different versions, with incompatible implementations. These packages should not be used and are flagged as Deprecated IEEE packages.

use ieee.std_logic_arith.all
use ieee.std_logic_signed.all
use ieee.std_logic_unsigned.all

Instead, use the standard ieee.numeric_std package.

use ieee.numeric_std.all

The package ieee.std_logic_misc has the same problem of not being standardized by IEEE. Contrary to the packages above, there is no consensus on how to replace this package. Sigasi Studio flags this package as Non-standard package.

use ieee.std_logic_misc.all

Read more on IEEE packages in Deprecated IEEE Libraries.

Rule configuration

These rules can be disabled for your project, or their severity and parameters can be modified in the project linting settings. Alternatively, they can be manually configured with the following template:

# For deprecated IEEE packages
# For Non-standard packages