20. Lecture - 21
The chapter delves into microinstructions and microprograms, highlighting the differences between hardwired control and microprogrammed control units. It emphasizes the flexibility of microprogrammed control, which allows for dynamic generation of control signals through memory, contrasting with the fixed nature of hardwired systems. The unit outlines key objectives, explaining essential concepts such as the sequencing and control signal generation in microprogrammed architectures.
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What we have learnt
- Microinstructions are essential for executing specific control signals in a microprogrammed control unit.
- Flexibility in control signal generation is achieved through microprograms stored in memory.
- Sequencing control signals and handling conditional jumps in microprogrammed controls can be more complex compared to hardwired systems.
Key Concepts
- -- Microinstructions
- Microinstructions specify the exact control signals needed to execute a particular operation within the CPU.
- -- Microprogrammed Control Unit
- A control unit that generates control signals from stored microinstructions in a dedicated memory, offering greater flexibility than a hardwired control unit.
- -- Program Counter
- In a microprogrammed architecture, the program counter tracks the current instruction being executed, similar to its function in conventional CPU architectures.
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