UCR EE/CS 120B   Digital Systems   Spring 1999  Professor Frank Vahid

Homework 3  Due: 5/18, BEFORE lecture.  You can turn it
in before lecture begins at 11:10, or put it under the door of
A207 before 11:00.  You must complete the following using two sides of 
only two stapled sheets of 8x11 paper (no perforated edges from spiral 
notebooks), Don't forget the required "This is my own original work"
statement at the top. SHOW YOUR WORK for every problem.

1. Design a 4-bit register that can load, clear and increment (and of
   course maintain its value).  Use D flip-flops having D and clock inputs
   only (no asynchronous reset).

2. Use 1kx2 RAMs to build a 3kx4 RAM.

3. Using the datapath of Figure 7.26, create an algorithm and control
   words (in the form of Fig 7.27 a, b and c) to perform the following:
      Outport = Inport * Inport
   Explain your algorithm clearly using comments.