8086 microprocessor architecture ppt

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UNIT-1 INTRODUCTION TO 8086

Minimum mode & Maximum mode system operation Timing diagrams INTRODUCTION TO MICROPROCESSOR: OVERVIEW OF A SIMPLE MICRO COMPUTER: The major parts are the central processing unit or CPU memory and the input and output circuitry or I/O Connecting these parts together are three sets of parallel lines called buses

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8086

8086- Architecture: Features • It is a 16-bit μp • 8086 has a 20 bit address bus can access up to 220 memory locations (1 MB) • It can support up to 64K I/O ports • It provides 14 16 -bit registers • Word size is 16 bits and double word size is 4 bytes • It has multiplexed address and data bus AD0- AD15 and A16 –A19

What is the internal architecture of 8086?
5. Internal architecture of 8086 • 8086 has two blocks BIU and EU. • The BIU handles all transactions of data and addresses on the buses for EU. • The BIU performs all bus operations such as instruction fetching, reading and writing operands for memory and calculating the addresses of the memory operands.
What are the execution units of a 8086 microprocessor?
The 8086 microprocessor has two main execution units: the execution unit (EU) and the bus interface unit (BIU). The BIU is responsible for fetching instructions from memory and decoding them, while the EU executes the instructions. The BIU also manages data transfer between the microprocessor and memory or I/O devices.
Is 8086 a 16 bit P?
It is a 16-bit μp. 8086 has a 20 bit address bus can access up to 220 memory locations (1 MB). It can support up to 64K I/O ports. It provides 14, 16 -bit registers. Word size is 16 bits and double word size is 4 bytes. It has multiplexed address and data bus AD0- AD15 and A16 – A19.
What are the advantages of 8086 microprocessor?
8086 provides the programmer with 14 internal registers, each of 16 bits or 2 bytes wide. The main advantage of the 8086 microprocessor is that it supports Pipelining. In order to increase execution speed and fetching speed, 8086 segments the memory. Its 20-bit address bus can address 1MB of memory, it segments it into 16 64kB segments.

The Bus Interface Unit (BIU)

It provides the interface of 8086 to external memory and I/O devices via the System Bus. It performs various machine cycles such as memory read, I/O read, etc. to transfer data between memory and I/O devices. BIU performs the following functions are as follows: 1. It generates the 20-bit physical address for memory access. 2. It fetches instruction

Prefetch Unit

The Prefetch Unit in the 8086 microprocessor is a component responsible for fetching instructions from memory and storing them in a queue. The prefetch unit allows the 8086 to perform multiple instruction fetches in parallel, improving the overall performance of the microprocessor. The prefetch unit consists of a buffer and a program counter that a

The Execution Unit (EU)

The main components of the EU are General purpose registers, the ALU, Special purpose registers, the Instruction Register and Instruction Decoder, and the Flag/Status Register. 1. Fetches instructions from the Queue in BIU, decodes, and executes arithmetic and logic operations using the ALU. 2. Sends control signals for internal data transfer opera

Decode Unit

The Decode Unit in the 8086 microprocessor is a component that decodes the instructions that have been fetched from memory. The decode unit takes the machine code instructions and translates them into micro-operations that can be executed by the microprocessor’s execution unit. The Decode Unit works in parallel with the Prefetch Unit, which fetches

Control Unit

The Control Unit in the 8086 microprocessor is a component that manages the overall operation of the microprocessor. The control unit is responsible for controlling the flow of instructions through the microprocessor and coordinating the activities of the other components, including the Decode Unit, Execution Unit, and Prefetch Unit. The Control Un

Execution of Whole 8086 Architecture

All instructions are stored in memory hence to fetch any instruction first task is to obtain the Physical address of the instruction is to be fetched. Hence this task is done by Bus Interface Unit

8086 microprocessor architecture Execution unit part-2/2

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