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-->Hard macros are generally in the form of IPs (or we termed it as IPs !).....
-->Important is those sre block level designs which are silicon tested and proved....
-->they might have been optimized for power or area or timing.
-->In physical design you can access pins of hard macros unlike soft macos which allows us to manipulate in different way.
-->you have frredom to move, rotate, flip but you can't touch inside anything inside macos
-->very common example of hard maco is memory...it can be any design which carries dedicated single functionality (in general)
-->be aware of features and characteristics of hard macro before you use it in your design... other than power, timing and area you also should know pin properties like sync pin etc
-->LEF file format allows easy usage of macos in different tools
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