Question

What are advantage and disadvantage of hardwired control and Microprogrammed control

Answer 1

Answer:

Advantages:

-The decoders and sequencing logic unit of a micro-programmed control unit are very simple pieces of logic, compared to the hardwired control unit, which contains complex logic for sequencing through the many micro-operations of the instruction cycle. It simplifies the design of the control unit. Simpler design means the control unit is cheaper and less error-prone to implement

-It is also flexible as changes could be easily made to the design Principal

Disadvantage:

-Slower than a hardwired unit of comparable technology Hardwired control unit is used for RISC Architecture because hardwired is faster and can improve the performance.

Microprogrammed control unit is used for CISC because it makes the design simpler and usually in CISC architecture, due to huge number of instructions in the instruction set, the control unit is quite complex. Hence it justifies using microprogrammed control unit.