1. Writer:-Rashedul Hasan Editor:- Jasim Uddin
Processor
Writer:-Rashedul Hasan
Editor:- Jasim Uddin

2. Processor
When entire CPU (both CU & ALU) is contained on a single tiny silicon chip, it is called microprocessor.
Silicon is an element that is widely found in clay and sand. It is a semiconductor.
Semiconductor is material whose electrical properties are intermediate between a good conductor of electricity and nonconductor of electricity.

3. Example of Conductor & Nonconductor
An example of good conductor of electricity is copper in household wiring.
An example of non conductor of electricity is the plastic sheath around the wiring.

4. Microprocessor

6. chip inside Pentium 4 processor

7. Inside the Microprocessor
Arithmetic Logic Unit
Control Unit
Registers

8. Registers
ALU contain registers. Therefore Register is a part of CPU not main memory.
Register is high speed storage area used to speed up the processing.
The length of a register equals the number of bits it can store. For example, if a register can store 8 bits, will be referred to 8 bit register.

9. Registers Most CPU sold today have 64 bit register.
It is also called Word size.
The bigger the word size, the faster the computer can process the data.

11. Common Registers.
Although the number of registers varies from computer to computer, there are some registers common to all computer. They are listed bellow,
Memory address Register [MAR]: Holds address of the active memory location.
Memory Buffer Register [MBR]: Holds information on its way to and from memory.

12. Common Registers.
Program Control Register [PC] : Holds address of the next instruction to be executed.
Accumulator Register [A] : Accumulates results and data to be operated upon.
Instruction Register [I] : holds an instruction while it is being executed.
Input/Output Register [I/O] : Communicate with Input & Output Devices.

13. System clock rate

14. Processor Speed. Processor performs at incredible speed.
Every processor contains a system clock which control how fast the operations within a computer take place.
Instruction are fetched, decoded and executed at proper intervals with intervals timed by a specific number of clock cycle.
The clock rate is the fundamental rate in cycles per second (measured in hertz) at which a computer performs its most basic operations such as adding two numbers or transferring a value from one register to another.

15. Clock Cycle
One clock cycle is the time it takes to perform one operation such as moving a byte of data from one memory location to another.
Normally several clock cycles are required to fetched, decoded and executed a single program instruction.
Shorter the clock cycle, faster the processor.
A single clock cycle typically lasting only a few nanoseconds in modern microprocessors

16. Ways of measuring processing speed.
Faster clock speeds will result in faster processing.
For microcomputer–Megahertz & Gigahertz
Megahertz: a measure of frequency equivalent to 1 million cycle [approx] per second.
for example, 933-MHz Pentium 3 processor can process 933 million cycles per second.

17. Ways of measuring processing speed.
Gigahertz: a billion cycles per second.
For minicomputers & Mainframes-MIPS:
MIPS stands for million of instruction per second.
a mainframe can perform at MIPS
For Supercomputer-Flops:
Flops stands for Floating point operations per second. A Floating point operation is special kind of mathematical calculation.
in case of super computer it is expressed as Megaflops, Gigaflops & Teraflops.

18. Processor Speed affected by:
System clock rate = Rate of an electronic pulse used to synchronize processing. (Only one action can take place between pulses.)
Measured in megahertz (MHz) where 1 MHz = 1 million cycles per second or gigahertz (GHz) where 1 GHz = 1 billion cycles per second.
This is what they are talking about if they say a computer is a 2.4 GHz machine. It's clock rate is 2.4 billion cycles per second.
Bigger number = faster processing

19. Architecture & Design of processor
Two main architecture or design for microprocessor are,
CISC : Complex Instruction Set Computing chips, which are used mostly in PCs, can support a large number of instruction but at relatively low processing speed.

20. Architecture & Design of processor
RISC : Reduced Instruction Set Computing chips, mainly used mostly in workstation.
Multi-core designs:
A different approach to improving a computer's performance is to add extra processors. A multi-core processor is simply a single chip containing more than one microprocessor core, effectively multiplying the potential performance with the number of cores.
From 2007 dual-core processors are widely used in servers, workstations and PCs while quad-core processors are now available for high-end applications in both the home and professional environments.

21. AMD Athlon Dual core processor

22. Kinds of Processor. Intel type chips : For PC
About 90% of microprocessor use Intel type microprocessor.
Are mainly made by the Intel Corporation.
Other manufacturers of this type includes, AMD
Cyrix
DEC

23. Kinds of Processor. Motorola-Type chips : For Macintoshes
It is mainly made by Motorola for Apple Macintoshes computer.

24. Bus Speed
Are data road ways through which bits are transmitted within the CPU an between CPU and other components of motherboard.

25. Bus Speed
Bus Speed = the amount of data the CPU can transmit at a time to main memory and to input and output devices. (Any path bits travel is a bus.)
An 8-bit bus moves 8 bits of data at a time. Bus width can be 8, 16, 32, 64, or 128 so far.
Think of it as "How many passengers (bits) can fit on the bus at once to go from one part of the computer to another."
Bigger number = faster transfer of data

26. Important Things to Know
You want a nice match between the word size and the bus size and the clock. It wouldn't do any good to have a bus that can deliver data 128 bits at a time, if the CPU can only use 8 bits at a time and has a slow clock speed. A huge line of data would form, waiting to get off the bus! When computers gets clogged like that, bad things can happen to your data. It's like people waiting to get into the theater. After a while, some of them may leave!!

27. Types of BUS
Parallel Bus
Serial Bus

28. Parallel & Serial Bus
Buses can be parallel buses, which carry data words in parallel on multiple wires,
or serial buses, which carry data in bit-serial form.