What is the list of basic and conventionnal building blocs in front end design?

[master_picengineer]

Hi All,
+ In front end design what is the list of basic and conventionnal building blocs (dff, latch,counters,...) enabling conceiving a module ?
+ In what case we use combinatory latches ?
Thanks

 

[Satdev Ahlawat]

Standard Cell

you can use for this fsm