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well not quite - people certainly add spare gates - but not for fixing individual errors - instead you add maybe 1% extra gates - if you find a bug in your desi
by Taniwha 11y ago
well not quite - people certainly add spare gates - but not for fixing individual errors - instead you add maybe 1% extra gates - if you find a bug in your design you can redo the upper metal layers using the extra gates to fix it - that changes ALL the chips you make, not just fix one bad transistor in aparticular chip
- gibrown 11y agoYou're right, that was inelegantly written and kinda conflates two different things. Gates are spread around for fixing design errors as you describe. There is also often redundant logic and memory built in to allow fixing individual chips though. Here's a quick presentation I found on laser repairs: http://www.ee.ncu.edu.tw/~jfli/memtest/lecture/ch07.pdf http://www.ee.ncu.edu.tw/~jfli/memtest/lecture/ch07.pdf