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vamsi_addagada
Joined: 05 Jul 2007
Posts: 132
Helped: 3
Location: bangalore
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 24 Sep 2009 6:04 what is Spare-cells ?where i can use those cells |
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| what is Spare-cells ?where i can use those cells in physical design
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jaydip
Joined: 07 Jun 2008
Posts: 47
Helped: 5
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29 Sep 2009 11:10 what is Spare-cells ?where i can use those cells |
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whenever it is required to perform some functional ECO, spare cells would be used .. these are extra cells, floating in an ASIC .. and if you want to include some more functionality, after chips is taped-out, you can use these cells to get avail of required functionality ..
hope it clarifies ...
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niravbhatt
Joined: 16 Mar 2009
Posts: 30
Helped: 2
Location: Ahmedabad,India
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30 Oct 2009 5:51 Re: what is Spare-cells ?where i can use those cells |
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Hi,
What Jaydip has said is correct. Once your ASIC is tapped out and after few month any bug popped up, how to fix this bug after tapped out.
So, in ASIC few floating gates/spare gates will be available which can be utilized to fix the bug.
Ex: Suppose to fix the bug you need 1 AND gate and 2 OR gates, then you can use those AND and OR spare gates from the ASIC.
I hope you understand it in brief. For further query please shoot messages.....
Thanks,
Nirav Bhatt
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shelby
Joined: 04 Jan 2007
Posts: 76
Helped: 10
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31 Oct 2009 19:45 what is Spare-cells ?where i can use those cells |
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The key in having spare cells in your design is that you only need to change the metal layers in order to rewire the logic and fix any bugs. This means you only need to pay for new metal masks, thus SAVING MONEY.
After a 1.0 tapeout, a 1.1 tapeout means you only changed some metal layers while 2.0 tapeout means you changed your base layers as well.
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