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Intel 8086
MICROPROCESSOR
ARCHITECTURE
Presented by
SUDESHNA DEY
Asst.Professor (ECE)
Dream Institute of Technology
Features
 20 bit address bus -220 memory locations (1 MB).
 Word size is 16 bit
 Address and data bus AD0- AD15 and A16 – A19.
 operate -- Minimum & Maximum.
 40 pin dual in line package.
 Address ranges -- 00000H to FFFFFH
Intel 8086 Internal Architecture
EXECUTION UNIT
The main parts are:
• Control Circuitry
• Instruction decoder
• ALU
EXECUTION UNIT – General Purpose
Registers
Pointer And Index Registers
 SP: Stack pointer
 BP: Base Pointer
 SI: Source Index register
 DI: Destination Index register
EXECUTION UNIT – Flag
Register
16 bit flag register
6 flags-- status flags
3 flags -–control Flags
BUS INTERFACE UNIT (BIU)
 6-byte Instruction Queue (Q)
• Segment Registers (CS, DS, ES, SS).
• Instruction Pointer (IP).
• Address Summing block (Σ)
Segment registers
• 4 segments registers are 16 bit
• Code Segment (CS), Data Segment (DS), Extra Segment (ES) Stack
Segment (SS)
8086 introduction.ppt

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