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Intel8086MICROPROCESSOR1

FeaturesItisa16-bitμp.8086hasa20bitaddressbuscanaccessupto220memorylocations(1MB).Itcansupportupto64KI/Oports.Itprovides14,16-bitregisters.Wordsizeis16bits.IthasmultiplexedaddressanddatabusAD0-AD15andA16–A19.Itrequiressinglephaseclockwith33%dutycycletoprovideinternaltiming.2
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8086 microprocessor-architecturePresentation Transcript * 1. Intel 8086MICROPROCESSOR 1 * It requires single phase clock with 33% duty cycle to provide internal timing. 2 It has multiplexed address and data bus AD0- AD15 and A16 – A19. Word size is 16 bits. It provides 14, 16 -bit registers. It can support up to 64K I/O ports. 8086 has a 20 bit address bus can access up to 220 memory locations (1 MB). It is a 16-bit μp.2. Features * Memory is byte addressable - Every byte has a separate address. 3 Address ranges from 00000H to FFFFFH A 40 pin dual in line package. It requires +5V power supply. It can prefetches up to 6 instruction bytes from memory and queues them in order to speed up instruction execution. 8086 is designed to operate in two modes, Minimum and Maximum.3. * 4. Intel 8086 Internal Architecture 4 * 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. The instruction bytes are transferred to the instruction queue.• EU executes instructions from the instruction system byte queue. 5 * 6. • Both units operate asynchronously to give the 8086 an overlapping instruction fetch and execution mechanism which is called as Pipelining. This results in efficient use of the system bus and system performance.• BIU contains Instruction queue, Segment registers, Instruction pointer, Address adder.• EU contains Control circuitry, Instruction decoder, ALU, Pointer and Index register, Flag register. 6 * 7. EXECUTION UNIT• Decodes instructions fetched by the BIU• Generate control signals,• Executes instructions.The main parts are:• Control Circuitry• Instruction decoder• ALU 7 * 8. EXECUTION UNIT – General Purpose Registers 16 bits 8 bits 8 bits AH AL AX Accumulator BH BL Base BX CX CH CL Count DX DH DL Data SP Stack Pointer Pointer BP Base Pointer SI Source Index Index DI Destination Index 8 * 9. EXECUTION UNIT – General Purpose Registers Register PurposeAX Word multiply, word divide, word I /OAL Byte multiply, byte divide, byte I/O, decimal arithmeticAH Byte multiply, byte divideBX Store address informationCX String operation, loopsCL Variable shift and rotateDX Word multiply, word divide, indirect I/O (Used to hold I/O address during I/O instructions. If the result is more than 16-bits, the lower order 16-bits are stored in accumulator and higher order 16-bits are stored in DX register) 9 * 10. Pointer And Index Registers• used to keep offset addresses.• Used in various forms of memory addressing.• In the case of SP and BP the default reference to form a physical address is the Stack Segment (SS-will be discussed under the BIU)• The index registers (SI & DI) and the BX generally default to the Data segment register (DS). SP: Stack pointer – Used with SS to access the stack segment BP: Base Pointer – Primarily used to access data on the stack – Can be used to access data in other segments 10 * 11. • SI: Source Index register – is required for some string operations – When string operations are performed, the SI register points to memory locations in the data segment which is addressed by the DS register. Thus, SI is associated with the DS in string operations.• DI: Destination Index register – is also required for some string operations. – When string operations are performed, the DI register points to memory locations in the data segment which is addressed by the ES register. Thus, DI is associated with the ES in string operations.• The SI and the DI registers may also be used to access data stored in arrays 11 * flags –control Flags 3 U U U U OF DF IF TF SF ZF U AF U PF U CF Sign Auxiliary Carry Interrupt Trap Zero Parity Over flow Direction U - Unused 126 flags indicates some conditions- status flags of the 16 are active flags and remaining 7 are undefined. 9 a 16 bit flag register 12. EXECUTION UNIT – Flag Register• A flag is a flip flop which indicates some conditions produced by the execution of an instruction or controls certain operations of the EU .• In 8086 The EU contains * 13. EXECUTION UNIT – Flag Register Flag PurposeCarry (CF) Holds the carry after addition or the borrow after subtraction. Also indicates some error conditions, as dictated by some programs and procedures .Parity (PF) PF=0;odd parity, PF=1;even parity.Auxiliary (AF) Holds the carry (half – carry) after addition or borrow after subtraction between bit positions 3 and 4 of the result (for example, in BCD addition or subtraction.)Zero (ZF) Shows the result of the arithmetic or logic operation. Z=1; result is zero. Z=0; The result is 0Sign (SF) Holds the sign of the result after an arithmetic/logic instruction execution. S=1; negative, S=0 13 * 14. Flag Purpose A control flag.Trap (TF) Enables the trapping through an on-chip debugging feature. A control flag.Interrupt (IF) Controls the operation of the INTR (interrupt request) I=0; INTR pin disabled. I=1; INTR pin enabled. A control flag.Direction (DF) It selects either the increment or decrement mode for DI and /or SI registers during the string instructions. Overflow occurs when signed numbers are added orOverflow (OF) subtracted. An overflow indicates the result has exceeded the capacity of the Machine 14 * 15. Execution unit – Flag Register• Six of the flags are status indicators reflecting properties of the last arithmetic or logical instruction.• For example, if register AL = 7Fh and the instruction ADD AL,1 is executed then the following happen AL = 80h CF = 0; there is no carry out of bit 7 PF = 0; 80h has an odd number of ones AF = 1; there is a carry out of bit 3 into bit 4 ZF = 0; the result is not zero SF = 1; bit seven is one OF = 1; the sign bit has changed 15 * 16. BUS INTERFACE UNIT (BIU)Contains• 6-byte Instruction Queue (Q)• The Segment Registers (CS, DS, ES, SS).• The Instruction Pointer (IP).• The Address Summing block (Σ) 16 * 17. THE QUEUE (Q)• The BIU uses a mechanism known as an instruction stream queue to implement a pipeline architecture.• This queue permits pre-fetch of up to 6 bytes of instruction code. Whenever the queue of the BIU is not full, it has room for at least two more bytes and at the same time the EU is not requesting it to read or write operands from memory, the BIU is free to look ahead in the program by pre-fetching the next sequential instruction. 17 * 18. • These pre-fetching instructions are held in its FIFO queue. With its 16 bit data bus, the BIU fetches two instruction bytes in a single memory cycle.• After a byte is loaded at the input end of the queue, it automatically shifts up through the FIFO to the empty location nearest the output.• The EU accesses the queue from the output end. It reads one instruction byte after the other from the output of the queue.• The intervals of no bus activity, which may occur between bus cycles are known as Idle state. 18 * The Complete physicallyavailable memory may be Stack segment (64KB)divided into a number of logicalsegments. FFFFF 19The CPU 8086 is able to Data segment (64KB) 1 MBaddress 1Mbyte of memory. Extra segment (64KB)The memory in an 8086/88based system is organized assegmented memory. Code segment (64KB)19. Physical MemorySegmented Memory 00000 * 20. • The size of each segment is 64 KB• A segment is an area that begins at any location which is divisible by 16.• A segment may be located any where in the memory• Each of these segments can be used for a specific function. – Code segment is used for storing the instructions. – The stack segment is used as a stack and it is used to store the return addresses. – The data and extra segments are used for storing data byte. * In the assembly language programming, more than one data/ code/ stack segments can be defined. But only one segment of each type can be accessed at any time. 20 * 21. • The 4 segments are Code, Data, Extra and Stack segments.• A Segment is a 64kbyte block of memory.• The 16 bit contents of the segment registers in the BIU actually point to the starting location of a particular segment.• Segments may be overlapped or non-overlappedAdvantages of Segmented memory Scheme• Allows the memory capacity to be 1Mb although the actual addresses to be handled are of 16 bit size.• Allows the placing of code, data and stack portions of the same program in different parts (segments) of the m/y, for data and code protection.• Permits a program and/or its data to be put into different areas of memory each time program is executed, i.e. provision for relocation may be done .• The segment registers are used to allow the instruction, data or stack portion of a program to be more than 64Kbytes long. The above can be achieved by using more than one code, data or stack segments. 21 * 22. Segment registers• In 8086/88 the processors have 4 segments registers• Code Segment register (CS), Data Segment register (DS), Extra Segment register (ES) and Stack Segment (SS) register.• All are 16 bit registers.• Each of the Segment registers store the upper 16 bit address of the starting address of the corresponding segments. 2223. 23 * 24. MEMORY 00000BIU Segment Registers 34BA0 CODE (64k) 44B9FCSR 34BA 44EB0 DATA (64K) 1 MBDSR 44EB 54EAF 54EB0ESR 54EB EXTRA (64K) 64EAFSSR 695E 695E0 STACK (64K) 795DF Each segment register store the upper 16 bit of the starting address 24 of the segments * 25. Instruction pointer & summing block• The instruction pointer register contains a 16-bit offset address of instruction that is to be executed next.• The IP always references the Code segment register (CS).• The value contained in the instruction pointer is called as an offset because this value must be added to the base address of the code segment, which is available in the CS register to find the 20-bit physical address.• The value of the instruction pointer is incremented after executing every instruction.• To form a 20bit address of the next instruction, the 16 bit address of the IP is added (by the address summing block) to the address contained in the CS , which has been shifted four bits to the left. 25 * 26. 26 * 27. • The following examples shows the CS:IP scheme of address formation: CS 34BA IP 8AB4 Code segment 34BA0Inserting a hexadecimal 0H (0000B) with the CSR or shifting the CSR 8AB4 (offset) four binary digits left 3D645 34BA0(CS)+ 8AB4(IP) 3 D 6 5 4 (next address) 44B9F 27 * 28. • Example For Address Calculation (segment: offset) • If the data segment starts at location 1000h and a data reference contains the address 29h where is the actual data?Offset 0000 0000 0010 1001Segment Address 0001 0000 0000 0000 0000Required Address 0001 0000 0000 0010 1001 28 * 29. Segment and Address register combination• CS:IP• SS:SP SS:BP• DS:BX DS:SI• DS:DI (for other than string operations)• ES:DI (for string operations) 29 * 30. Summary of Registers & Pipeline of 8086 µP EU BIUAX AH AL IPBX BH BL Fetch &CX CH CL D store code CS DS ES SS EDX DH DL C bytes in C O PIPELINE C O O IP BX DI SP D PIPELINE SP D E (or) D DI BP E O QUEUE E BP I SI R U SI T N DI Default Assignment Timing FLAGS ALU control 30
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