2 CPU Architecture: Fetch-Execute Cycle - uni …

212 CPU architecture : Fetch-Execute CPU, Main memory, I/O unitsAny modern digitcal computer can be described as having only three majorfunctional hardware units:(For now, we will ignoresecondary memory, like hard disk drives.)22PC motherboard (Intel Pentium)23 BusThe functional units are interconnected to enable data transport ( ,writeCPU registerdatacontent to a certainaddressin memory) The unit unit interconnections are referred to as abusses Bus: a bundle of conductors (wires/tracks) layed out on themotherboard(bus width= number of conductors in bundle) Data and addresses are communicated on separatedataandaddressbusses( , Intel 8086 used shared data/address bus) ExamplesCPUA ddress bus widthData bus widthIntel Pentium IV3264 Intel Itanium446424 Bus Bus types:1 data bus(move data)2 address bus(select address in memory, select port in I/O unit)3 control bus(synchronize units, request action from unit, unit state) The busses provide an infrastructure that issharedby all units.

21 2 CPU Architecture: Fetch-Execute Cycle 2.1 CPU, Main memory, I/O units Any modern digitcal computer can be described as having only three major

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