# Control of Single Flip-flops

The control gates for the seven flip-flops can be determined in a similar manner. For example, Table 5-6 shows that lEN may change as a result of the two instructions ION and !OF.

pB7: lEN +-1

pB6: lEN +-0

where p = D71T3 and B, and B, are bits 7 and 6 of lR, respectively. Moreover, at the end of the interrupt cycle lEN is cleared to 0.

RT2: lEN +-0

**Frequently Asked Questions**

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Ans: The registers of the computer connected to a common bus system are shown
in Fig. 5-4. The control inputs of the registers are LD (load), INR (increment),
and CLR (clear). Suppose that we want to derive the gate structure associated
with the control inputs of AR. We scan Table 5-6 to find all the statements that
change the content of AR view more..

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Ans: he block diagram of the control logic gates is shown in Fig. 5-6. The inputs
to this circuit come from the two decoders, the I flip-flop, and bits 0 through
11 of IR. The other inputs to the control logic are: AC bits 0 through 15 to check
if AC = 0 and to detect the sign bit in AC( view more..

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Ans: 1. A memory unit with 4096 words of 16 bits each
2. Nine registers: AR, PC, DR, AC, IR, TR, OUTR, INPR, and SC
3. Seven flip-flops: I, S, E, R, lEN, FGI, and FGO
4. Two decoders: a 3 x 8 operation decoder and a 4 x 16 timing decoder view more..

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Ans: The control gates for the seven flip-flops can be determined in a similar
manner. For example, Table 5-6 shows that lEN may change as a result of the
two instructions ION and !OF. view more..

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Ans: 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. view more..

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