Quiz submission record for quiz5-1-2 at Tue Jul 20 09:26:27 2004:

Your Answer for Question 1:
c5 = g4 + (p4*g3) + (p4*p3*g2) + (p4*p3*p2*g1)+(p4*p3*p2*p1*g0)+ (p4*p3*p2*p1*p0*c0) 

Your Answer for Question 2:
When the ALUSrc is asserted, the second ALU operand is the sign-extended, lower 16 bits of the instruction.  When the ALUSrc is deasserted, the second ALU operand comes from the second register file output.

Your Answer for Question 3:
The Xs represent don't cares, indicating that the output does not depend on the value of the input corresponding to that column.  The SOP is, then:

o = not(a) + anot(c)

The table isn't "complete" in the sense that with three inputs one would generally expect 2^3 combinations and only three are shown above.  However, it is complete since the Xs merely simplify the table and still cover all possibilities.  That is,
the entry 1 X 0 | 1, for example, is just a condensed way of saying:
1 0 0 | 1
1 1 0 | 1
so, all the combinations of inputs are included in the table, they are just disguised :)


Your unique submission ID is quiz5-1-2-cs61c-ax-1090340787-2593.