some warning when load lef in Encounter

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Greatrebel

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Hi all,

when I load a design in Encounter, I got some warnings which I am not sure would hurt my design.

There are a lot of warnings when I load I/O lef.

Pin 'PAD' in macro 'PRDW0812SCDG_25' has no ANTENNAGATEAREA attribute defined. For any non-power/ground input or inout pin, The attribute should be
defined if any area ratio antenna attribute is defined on any layer.

When load timing lib, a lot of warnings like

**WARN: (TECHLIB-436): Attribute 'max_fanout' on output/inout pin 'Z' of cell 'AN2HVTD0' is not defined in the library

Any help will be appreciated.
 

Both are fine.

PAD pins have no routing so you can't get antenna violations.

max_fanout isn't always defined for library cells (sometimes they have a default at the top of the .lib) Usually max_cap and max_trans are more of a concern than max_fanout.
 

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    Greatrebel

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