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Controlling

A micro progr...

Question

A micro program control unit is required to generate a total of 25 control signals. Assume that during any microinstruction at most two control signals are active. Minimum number of bits required in the control word to generate the required control signal

A

10

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B

12

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C

2

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D

25

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Solution

The correct option is A 10

5 bits 5 bits

5 bits to identify first and 5 bits to identify second including the case when one of them not present.

So total bits required = 10

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where all the instructions require

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control signals are needed to be generated by the control unit. While designing the horizontal micro-programmed control unit, single address field format is used for branch control logic. What is the minimum size of the control word and control address register?

Q. The data path shown in the figure computes the number of 1s in the 32-bit input word corresponding to an unsigned even integer stored in the shift register. The unsigned counter, initially zero, is incremented if the most significant bit of the shift register is 1.

The microprogram for the control is shown in the table below with missing control words for microinstructions

I_{1}, I_{2}, . . . . ., I_{n}

Micro- instruction	reset_counter	shift_left	load_output
BEGIN	1	0	0
$I_{1}$	?	?	?
:	:	:	:
$I_{n}$	?	?	?
END	0	0	1

The counter width (k), the number of missing microinstructions (n), and the control word for microinstructions

I_{1}, I_{2}, . . . . ., I_{n}

are, respectively.

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10

control signals

S 1

S 10

in various time steps

T 1

T 5

4

I 1

I 4

as shown below.

	$T 1$	$T 2$	$T 3$	$T 4$	$T 5$
$I 1$	$S 1, S 3,$ $S 5$	$S 2, S 4,$ $S 6$	$S 1, S 7$	$S 10$	$S 3, S 8$
$I 2$	$S 1, S 3,$ $S 5$	$S 8, S 9,$ $S 10$	$S 5, S 6,$ $S 7$	$S 6$	$S 10$
$I 3$	$S 1, S 3,$ $S 5$	$S 7, S 8,$ $S 10$	$S 2, S 6,$ $S 9$	$S 10$	$S 1, S 3$
$I 4$	$S 1, S 3,$ $S 5$	$S 2, S 6,$ $S 7$	$S 5, S 10$	$S 6, S 9$	$S 10$

Which of the following pairs of expressions represent the circuit for generating control signals

S 5

S 10

respectively
[(IJ+Ik)Tn indicates that the control signal should be generated in time step

T n

if the instruction being executed is IJ or IK]?

Q. A logic circuit controls the passage of a signal according to the following requirements:
1. Output X will equal to A when control input B and C are same
2. X will remain high when B and C are different.
The logic circuit will be

Q. An instruction set of a processor has

125

signals which can be divided into

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Group

1 : 20

2 : 70

3 : 2

4 : 10

5 : 23

signals

How many bits of the control words can be saved by using vertical microprogramming over horizontal microprogramming?

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