A micro-program sequencer is a crucial component in a microprogrammed control unit, serving as a key building block.
- Basic Components:
- The two main parts of a micro-programmed control unit are the control memory and the component responsible for selecting the next address.
- Micro-Program Sequencer:
- The component handling the task of selecting the next address is known as the micro-program sequencer.
- Functionality:
- The primary role of the micro-program sequencer is to provide an address to the control memory. This allows the retrieval and execution of micro-instructions.
- Address Selection:
- The sequencer determines which specific address should be loaded into the control address register for the next step in the instruction execution process.
- Next Address Logic:
- The logic within the sequencer, often referred to as the next address logic, decides the source of the address to be loaded. It relies on information bits received from the present micro-instruction.
- Address Source Choice:
- The decision on the address source is influenced by the details provided in the present micro-instruction. This ensures that the correct address is chosen for the next micro-instruction in the sequence.
- Instruction Execution:
- All the instructions are stored in the control memory. The current micro-instruction, required for the ongoing operation, is placed in the micro-instruction register for execution.
| Aspect | Horizontal Organization | Vertical Organization |
|---|---|---|
| Hierarchy | Flatter hierarchy with few levels | Taller hierarchy with multiple levels |
| Communication | Direct and quick | Passes through several layers, slower |
| Flexibility and Adaptability | More flexible and adaptable | Less flexible, slower to adapt to changes |
| Employee Empowerment | More empowerment and autonomy | Limited empowerment, centralized decisions |
| Organizational Culture | Collaborative and team-oriented | Traditional, structured, clear chain of command |
| Scalability | More scalable as it grows | May face challenges in scalability |
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