Question: What's the difference between Borderless SRAM

[cpsean]

Question:
Who can tell me what's the difference
between Borderless SRAM and Bordered SRAM.
especially the layout difference.

Thanks

 

[Colbhaidh]

Re: Question: What's the difference between Borderless

Not sure this is the answer but in most SRAM layouts the cell blocks are surrounded by dummy SRAM cells which are not active. These allow for process variations between the dense SRAM cell array and more sparse decoder areas. In processing, the edge of the dense SRAM array, i.e. the edge cells can have different critical dimensions. So to prevent any mis-matching, a dummy cell is added such that edge cells are identical to any other.
Not everyone uses this practise as it is possible to eliminate this processing effect or at least redeuce it considerably and thus the cell array is not bordered with dummy cells.
I have not heard this called bordered or borderless so I may be bordering on the wrong answer.

 

[cpsean]

Re: Question: What's the difference between Borderless

I basically catch ur mean, It's called in UMC process
by Memory Compiler of library Vendor