Cache in SOCs

Dear Sir/Ma'am,

In SOC size of interconnections between multiple processors is very small. So is it possible to have one big size central cache for all processors ignoring access time. 

I know processors share cache memories with other processors by using interconnections. 

But can we make an SOC that have a single central cache for all processors. If we can do this what will be its disadvantages other than longer access time.

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