Question

a type of control unit in which a nano-instruction memory is included.
hardwire
single level microprogrammable
multiprocessor
two level microprogrammable

Explanation:

To determine the type of control unit with nano - instruction memory, we analyze the options:

• Hardwire: Hardwired control units are based on fixed logic circuits and do not have a nano - instruction memory in the relevant context.
• Single Level Microprogrammable: In single - level microprogramming, the micro - instructions are at one level and do not typically include a nano - instruction memory.
• Multiprocessor: A multiprocessor is a system with multiple processors and is not a type of control unit with a nano - instruction memory.
• Two Level Microprogrammable: Two - level microprogrammable control units have a hierarchical structure where a nano - instruction memory is included to store the lower - level (nano -) instructions that help in executing micro - instructions.

Answer:

D. Two Level Microprogrammable