The 16-bit common bus shown in Fig. 5-4 is controlled by the selection inputs
S2, S1, and 50• The decimal number shown with each bus input specifies the
equivalent binary number that must be applied to the selection inputs in order
to select the corresponding register. Table 5-7 specifies the binary numbers for
S2S1S0 that select each register. Each binary number is associated with a Boolean
variable x1 through x7, corresponding to the gate structure that must be active
in order to select the register or memory for the bus. show more...