Advanced Microprocessors and Sign up to vote on this title Useful Not useful Peripherals : A K Ray
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80286
The second generation of 16-bit micro processors Sign up to vote on this title
Useful Released in 1982 by Intel
68
pin IC
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Various
versions of 80286 are available r un on 12.5 MHz, 10 MHz and 8 MHz cl frequencies Sign up to vote on this title
Not usefuluction Upwardly compati ble with Useful theinstr You're Reading a Preview of 8086
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Memory can address
1 GB
of virtual memor
80286
The concept of virt ual memory is impleme Sign up to vote on this title Not useful can Useful the CPU using physical memory that You're Reading a Preview directly access and secondary memory th
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The program may be divided into a set of segments
At any instant, a segment portion of act u Sign up to vote on this title program required for execution atNot useful that ins Useful You're Reading a Preview exists in the physical memory at the time o
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the portion of a program is req for execution by the CPU, it is fetched from the secondary memory andSignplaced in the up to vote on this title Useful Not useful physical memory. This is called as swapp You're Reading a Preview in of the program
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In (Swapping) Sign up to vote on this title
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econdar memory
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80286-
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Register Organisatio
contains almost the same set of registers as in 8086 Sign up to vote on this title 80286
Eight 16 bit
Useful
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general purpose registers (AX, BX, You're Reading a Preview
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AH
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Register Organisatio AL
BH
BL
CH
CL
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CS
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Internal Block Diagra
Contains 4 f unctional parts:
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1)
Address Unit(AU)
2)
B s Unit (BU)
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Internal Block Diagram Sign up to vote on this title
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Address Unit(AU) :
Responsi ble for calculating the physical addre Sign up to vote on this title of instr uctions and data that the CPU wants to Useful Not useful access You're Reading a Preview
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Bus Unit (BU) :
Sheet Music
Physical address computed by AU is handed over to BU
BU transmit this physical address over the Sign up to vote on this title address bus A0 ± A23 Useful Not useful
Reading a Preview BU fetch instr uctionYou're from memory bytes
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Instruction Unit (IU) :
IU accepts instr uctions from the prefetch que and an instr uction decoder decodes them one Sign up to vote on this title by one
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The decoded instr uYou're ctions are stored in a Reading a Preview
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Execution
Output
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Unit (EU) :
of decoding circ uit drives a control circ
in EU
It is responsible for executing the instr uctions Useful Not useful received frm the decoded instr ction queue You're Reading a Previewu Sign up to vote on this title
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Operating Modes
80286
Sign up to vote on this title works in two operating mode
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Real Address Mode You're Reading a Preview
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Real Addressing Mode
Just
act as a fast
Instr uction set is pward compatible wi uReading You're a Preview
8086.
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Real Addressing Mode ± Address Calculation Sign up to vote on this title
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The 80286 reserves two fixed areas of physical memory for
System Initialization
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(FFFFYou're to FFFFFH) 0H Reading a Preview
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Protected Virtual Address Mod (PVAM)
up to vote on this titleconce The first processor to suSign pport the Useful Not useful of virtual memory You're Reading a Preview
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Large programs are divided into smaller segments which are arranged in appropria sequence and are swapped in or out of pr Sign up to vote on this title the memory as per the req uirements, for Useful Not useful complete execution of program You're Reading a Preview
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How it works? Sign up to vote on this title
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Descr iptors
Large programs are divided into smaller segments which are arranged in appropria Sign up to vote on this title sequence and are swapped in or ut of pr useful Useful Noto You're Reading a Preview memory as per the req uirements, for the
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It carry all relevant information regardin segment and its access rights.
The descriptor segment, like
contains
Segment base address
Segment limit
information Sign up to vote on this title
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o
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Descr iptor Types
Types of descriptors:
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Descr iptors
up to vote on this title For code, stack and dataSignsegments
Code segmentYou'redescriptors are Reading a Preview
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use
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Contains
16 bit
segment limit
24 bit
segment base address
8 bit
Remaining 16 bYou're its Reading are reserved by Intel for a Preview
access byte rights
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8 bit P
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access byte rights (Refer Page: 458 DPL
S
E
TYPE
A
P (Present) Sign up to vote on this title
Useful Not useful is Used to indicate whethersegment You're Reading a Preview available in physical memory
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E (Executable)
Used to distinguish between code & data segments
E=0
Data Segment
E=1
Code Segment
A (Accessed)
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System Segment Descriptors
Sign up to vote on thisdata title Used by 80286 to store system an Useful Not useful execution stateYou're of Reading a task (for multitaskin a Preview
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System Descriptors
This descriptor contains
16-bit
segment limit
24-bit
segment base address Sign up to vote on this title
Access byte right contains P-bit
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Gate
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Descriptors
The gate descriptors control the access Sign up to vote on this title entry points of the code to beexec Not useful uted Useful You're Reading a Preview Contains the information regarding
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Gate
descriptors provide mechanism to keep track of source and destination of control transfer . Sign up to vote on this title
Useful Not useful Hence CPU can perform protection che Reading a Preview and controls theYou're entry points of the
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Call gates are used to alter the privilege
Task gates are used to switch from one task another .
up to voteto on this title Interr upt and trap gates are Sign specify t used Useful Not useful corresponding routines.
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Descriptors
Segment Descriptors
System Control Sign up to vote on this title
Code Segment
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Descr iptor Cache
registers
Sign upintrod to vote on this title The concept of caching was i uced
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6-byte
segment descriptor cache register is as to each of the fo ur segments
A segment descriptor is a utomatically loaded in segment descriptor cache register, whenever t Sign up to vote on this title associated segment register is loaded Useful Not useful Once
You're Reading a Preview all the informa a cache register is loaded,
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Program/Visible Segment Selectors CS
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DS
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Program Invisible Access Rights
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Segment Physical Base Useful Not useful Address You're Reading a Preview
Segm Siz
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Fields
In protected mode the contents of Sign up to vote on this title segment register is called selectors Useful Not useful
16-bit
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RPL (Requested Privilege Level), refers You're Reading a Preview the privilege of that
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Descr iptor Tables
to vote on this title The array of descriptors Sign isupcalled as Useful Not useful descr iptor table You're Reading a Preview
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Local and Global Descr iptor Table
Sign up(to vote on this titleconta A Global Descriptor Ta ble DT) G Useful Not useful global descriptors common common for all the ta
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A segment cannot be accessed, descriptor does not exist in either LD GDT. Sign up to vote on this title
LGDT (Load Global DescUseful riptoNotr useful Table LLDT (Load Local Descriptor T
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Interrupt Descr iptor Table
Signu uppt to votegates on this title IDT is used to store interr and Useful Not useful trap gates
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PRIVILEGE
Sign up to vote on this title priv Supports four level hierarchical Useful Not useful mechanism toYou'recontrol the acces Reading a Preview
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Pr ivilege Types Sign up to vote on this title
Task Privilege
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Task Pr ivilege
Each
task assigned a privilege level, which indicate the priority or privilege of that task Sign up to vote on this title
Any one of the fo ur privilege Useful level may Not useful used execute a task You're Reading a Preview
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It can only changed by transferring the control, using gate descriptors, to a ne segment Sign up to vote on this title
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A task executing at level 0, the most You're Reading a Preview
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Descr iptor Pr ivilege
The descriptor privilege is specified y the D btitle Sign up to vote on this Useful Not useful field of the access rights byte .
You're Reading a Preview
The DPL specifies the least privilege level th
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Pr ivilege
This privilege is specified by the RPL field of segment register (selector) Sign up to vote on this title
A selector may use a less tr sted privilege th Not useful uUseful You're level Reading a Preview the current privilege for f urther use.
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Protection
The 80286 supports the following three basic Sign up to vote on this title mechanism to provide protection Useful Not useful
1.
Restricted use of You're segments: Reading a Preview
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Protection Sign up to vote on this title . Privileged Instr uctions or Operations:
3
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These are to You're ted or carried o u be exec Reading au Preview
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Math Coprocessor
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