GATE | GATE-CS-2004 | Question 66

The microinstructions stored in the control memory of a processor have a width of 26 bits. Each microinstruction is divided into three fields: a micro-operation field of 13 bits, a next address field (X), and a MUX select field (Y). There are 8 status bits in the inputs of the MUX.


How many bits are there in the X and Y fields, and what is the size of the control memory in number of words?
(A) 10, 3, 1024
(B) 8, 5, 256
(C) 5, 8, 2048
(D) 10, 3, 512

Answer: (A)

Explanation: MUX has 8 states bits as input lines so we require 3 select inputs to select and input lines.

No. of bits in control memory next address field=26-13-3 =10

10 bit addressing .we have 2 10 memory size

So X,Y size=10,3

So (A) is correct option.

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