News for hackers. Stuff that matters.

A comment on Reverse-engineering a carry-lookahead adder in the Pentium. Parent comment

Re:Reverse-engineering a carry-lookahead adder in the Pentium by hn3er1q on Sunday January 19, 2025 @12:10AM (#42753868)
I just remembered your article on the standard cells of Pentium and there you noted bicmos was used by some gates for a reduction in propagation delay in some instances. Were any of the gates in the adder structures bicmos?
[ Parent | on HN ]
Re:Reverse-engineering a carry-lookahead adder in the Pentium by kens on Sunday January 19, 2025 @03:26AM (#42755068)
No, the adder was all CMOS. But there are some BiCMOS drivers visible at the bottom of one of the photos. The NPN transistors are big squares, unlike the CMOS transistors.
[ Parent | on HN ]