Computer Science 324 Computer Architecture Mount Holyoke College Fall 2007

Agenda

• Announcements
  • Lab 2 due tonight.
• Lecture assignment recap
• MIPS ISA wrapup
  • Working with large constants
  • instructions vs. pseudoinstructions
• A brief look at the IA-32 ISA
• Digital logic
  • resistors and transistors
  • the inverter
  • NOR and NAND
  • digital logic gate abstractions
• Lab 3 out.
  • Written part: turn in on paper in person on Monday or by slipping it under my door Monday night
  • Circuits: you'll need to pair up, since we only have three digital logic stations, and you need to demonstrate your circuits by Monday at 4 PM

Lecture Assignment

Due at the start of class, Wednesday, September 26.

Turn in short answers to these questions. Please turn in a hard copy (typeset or handwritten are OK). We will discuss these questions during class, so no late submissions are accepted.

There are no new readings. You may refer to my notes on digital logic and to P&H Appendix B as you need clarification on any of our digital logic topics.

1. We constructed a NAND gate from two transistors in series. What function of three inputs is obtained by placing three transistors in series?

   

2. Show that the NOR gate is universal by building circuits to compute NOT, AND, and OR using only NOR gates.