Execution Unit 1 | Architecture OF 8086 | Microprocessor & it's Peripherals Interfacing | Summary and Q&A

TL;DR

The execution unit in a processor architecture is responsible for executing instructions, performing arithmetic and logical operations, and storing results in registers.

Key Insights

• 🎭 The execution unit performs arithmetic and logical operations on data fetched from memory.
• 🎮 The control system in the execution unit decodes opcodes and generates control signals.
• 🏪 General purpose registers store data, while segment registers store offset addresses.
• 👨‍💼 The bus interface unit fetches instructions from memory for execution.
• 🇦🇪 The execution unit stores results in registers and updates flags to indicate status.
• 🫦 Physical addresses are calculated to access the address bus using 16-bit registers.
• 💁 An assembler converts assembly language instructions into binary format.

Transcript

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Questions & Answers

Q: What is the purpose of the bus interface unit?

The bus interface unit fetches instructions from memory to be executed by the execution unit.

Q: Why do we calculate the physical address?

Physical addresses are calculated to access the 20-bit address bus using 16-bit registers in order to fetch data.

Q: How is data saved in memory while typing a program?

The data is converted into machine language or binary format by an assembler, and each instruction has a specific opcode that represents the data.

Q: What does the control system in the execution unit do?

The control system decodes the opcode of each instruction and generates control signals for the execution unit to perform the appropriate operation.

Summary & Key Takeaways

• The execution unit executes instructions and performs arithmetic and logical operations.

• It fetches data from the bus interface unit and stores results in registers.

• General purpose registers hold data, while segment registers store offset addresses.