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Microprogrammed control unit:

a)is faster than a hardwired control unit

b)facilitates easy implementation of new instructions

c)is useful when very small programs are to be run

d)usually refers to control unit of a microprocessor
asked in CO & Architecture by (133 points)
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(a) is wrong. Microprogrammed CU can never be faster than hardwired CU. Microprogrammed CU it has an extra layer on top of hardwired CU and hence can only be slower than hardwired CU.

(b) is a suitable answer as we can add new instruction by changing the content of control memory.

(c) is not correct as when only small programs are there, hardwired control makes more sense.

(d) control unit can also be hardwired, so this is also not correct.

Reference: http://www2.mta.ac.il/~carmi/Teaching/Architecture/SlidesOriginal/ch07%20-%20Microprogrammed%20Control.pdf
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Why not d?


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