Page 419 - Engineering Digital Design

PROBLEMS 389

0 4-to-1
Binary-to-Gray S 0
1 Converter MUX

S 0(H)
S,(H)
S 2(H)
S 3(H)

(a)

A B , S 0

0 0
0 1
1 0
1 1
(b)

FIGURE P8.3

To do this, list all partial products, indicate the sum and carry values at each stage,
and end with the final product values.
8.20 (a) Combine the 4 x 4 binary multiplier in Fig. 8.18 with the 8-bit binary-to-BCD
converter in Fig. P6.3 to produce a one-digit BCD multiplier that can be bit-
sliced to form an n-digit BCD multiplier. What restrictions must be placed on the
operands?
(b) Test the results of part (a) by introducing the following operands into the resulting
circuit of part (a):

Testtfl A = 0111; B = 1000
Test #2 A = 1001; B =0011