in CO and Architecture
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5 votes
5 votes
Microprogrammed control unit uses fixed logic to interrupt instruction.

True or False.
in CO and Architecture
2.1k views

4 Comments

it should be false ...

we uses microprogrammed control unit so that we can have a flexibility over CONTROL signals and execution...

ONLY in case of hardwired ..we have fixed logic ...but for Microprogramming ..we can have flexiblity..
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@Shubham, how would you relate this to interrupting instruction?
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I think False because microprogrammed  control unit uses flexible logic.
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1 Answer

2 votes
2 votes

In microprogrammed control unit, the logic of the control unit is specified by a microprogram.

As we are using a program to generate control signals no fixed logic is required.

For hardwired CU 

Hardwired control units are implemented through use of combinational logic units, featuring a finite number of gates that can generate specific results based on the instructions that were used to invoke those responses. Hardwired control units are generally faster than microprogrammed designs.[4] Their design uses a fixed architecture—it requires changes in the wiring if the instruction set is modified or changed. This architecture is preferred in reduced instruction set computers (RISC) as they use a simpler instruction set

Ref: http://nptel.ac.in/courses/106103068/21

https://en.wikipedia.org/wiki/Control_unit#Hardwired_control_unit

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