19. Finite State Machine Implementation for ADD R1,M
The chapter covers the operation of hardwired control units in CPUs, focusing on the sequencing of operations and control signals involved in executing macro instructions. It delves into the roles of micro-instructions and the significance of external signals in determining state transitions in finite state machines. Additionally, the importance of optimizing hardware implementation for conditional and unconditional jumps is emphasized.
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What we have learnt
- The operation of hardwired control units involves generating control signals based on instruction opcodes.
- Finite state machines are essential for sequencing operations within a CPU, with transitions often depending on both state variables and external signals.
- Conditional jumps require evaluating internal flags to determine instruction flow, showcasing the complexity of control unit designs.
Key Concepts
- -- Hardwired Control Unit
- A type of control unit that generates control signals through fixed combinational logic, allowing rapid execution of instructions.
- -- Finite State Machine (FSM)
- A computational model consisting of states and transitions, representing the operation of the control unit based on input signals.
- -- Macro Instructions
- Higher-level instructions that can be broken down into simpler micro-instructions executed by the control unit.
- -- Control Signals
- Signals generated by the control unit that direct the operation of various components within the CPU.
- -- Conditional Jump
- An operation in which the next instruction to execute depends on the evaluation of a condition, such as the status of a flag.
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