CS 120 Lecture Notes - Lecture 5: Logic Gate, Or Gate, Logisim

• School: Binghamton University
• Department: Computer Science
• Course: CS 120
• Professor: Steven Moore

Document Summary

There are 2 billion transistors in the iphone cpu. Ten years ago the standard desktop had 48 million. The cpus ha(cid:448)e stayed the sa(cid:373)e i(cid:374) the past fe(cid:449) years, (cid:271)e(cid:272)ause (cid:449)e"(cid:448)e hit a heat (cid:449)all. Cpus ha(cid:448)e (cid:271)e(cid:272)o(cid:373)e so hot that, if (cid:449)e (cid:272)o(cid:374)ti(cid:374)ued o(cid:374) the sa(cid:373)e path, the cpus (cid:449)ould"(cid:448)e (cid:271)e(cid:272)o(cid:373)e as hot as the sun. Floati(cid:374)g (cid:272)ir(cid:272)uits are (cid:271)ad, (cid:271)e(cid:272)ause there (cid:449)ould(cid:374)"t (cid:271)e a (cid:1005) state or (cid:1004) state. Transistors take a 1 to open, and a 0 to close, or vice versa. There is (cid:374)othi(cid:374)g that does(cid:374)"t ha(cid:448)e so(cid:373)e sort of (cid:272)urre(cid:374)t goi(cid:374)g through it; e(cid:448)e(cid:374) hu(cid:373)a(cid:374)s ha(cid:448)e a (cid:272)urre(cid:374)t. Because of this, the accepted value for 0 is the ground state. Open (on) is 0, (cid:449)o(cid:374)"t allo(cid:449) po(cid:449)er to ru(cid:374) through. Closed (off) is 1, allows power to run through. Whatever bit goes in will be inverted in the output.