18.2.3. Decoder and Encoder in Control Units

Try these first

1. 1.

   What is the primary function of a decoder in a hardwired control unit?

   Hint

   Think about how instructions are activated in hardware.

2. 2.

   Define a finite state machine (FSM).

   Hint

   It’s a model used in digital systems to describe how a unit operates.

3. 3.

   What component selects the finite state machine for an instruction?

   • ALU
   • Decoder
   • CPU

   Hint

   Which part handles the opcode?

4. 4.

   Is a hardwired control unit more flexible than a microprogrammed one?

   • True
   • False

   Hint

   Consider how each type interacts with instruction sets.

5. 5.

   Design a finite state machine diagram based on an ADD instruction with at least five states, including fetch, decode, and execute. Provide transition rules.

   Hint

   Think about the steps involved in performing an arithmetic operation.

6. 6.

   Classify different types of computer architectures based on their control unit design and explain the implications of each type's flexibility.

   Hint

   Consider historical contexts of CPU designs and their evolution.