Explain the differences of micro programmed and hardwired control unit

Sure, here are the differences between a micro programmed and hardwired control unit:

1. Implementation: A micro programmed control unit is implemented using programming logic. It uses a microprogram (a sequence of microinstructions) stored in a control memory to execute instructions. On the other hand, a hardwired control unit is implemented using combinational logic circuits and does not use a microprogram.

2. Flexibility: Micro programmed control units are more flexible than hardwired control units. Changes can be made in the microprogram to alter the functionality of the control unit. However, in a hardwired control unit, changes in functionality require changes in the wiring of the logic circuits, which is more complex and time-consuming.

3. Speed: Hardwired control units are typically faster than micro programmed control units. This is because the hardwired control unit directly implements the control logic in hardware, while the micro programmed control unit needs to fetch and decode microinstructions from the control memory, which takes more time.

4. Complexity: Micro programmed control units are less complex than hardwired control units. The control logic in a micro programmed control unit is implemented as a sequence of simple microinstructions, while the control logic in a hardwired control unit is implemented as a complex network of logic gates.

5. Cost: Micro programmed control units are generally cheaper to design and manufacture than hardwired control units. This is because changes in the microprogram can be made without any physical changes to the control unit, while changes in a hardwired control unit require physical changes to the logic circuits.

6. Use: Micro programmed control units are typically used in complex and CISC (Complex Instruction Set Computing) processors where the instructions are more complex and varied. Hardwired control units are typically used in simple and RISC (Reduced Instruction Set Computing) processors where the instructions are simple and uniform.