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The micro-instructions stored in the control memory of a processor have a width of 26 bit. Each micro-instruction is divided into three fields; a micro-operation field of 13 bit, 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 in the size of the control memory in number of words?
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- 10, 3, 1024
- 8, 5, 256
- 5, 8, 2048
- 10, 3, 512
- 10, 3, 1024
Correct Option: A
MUX has 8 states bits as input lines so we require 3 select inputs to select & input lines. No. of bits in control memory next address field = 26 – 13 – 3
= 10
10 bit addressing, we have 210 memory size. So X, Y size = 10,3,1024
Hence (a) is correct option.
