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Microprocessor I

Microprocessor I. Including CPU, crystal, registers, binary numbers, EDB, RAM, Northbridge, & Address Bus. The CPU. The man in a box allegory To communicate with the CPU we use the External Data Bus Series of switches (8) 1 = on, 0 = off. External Data Bus.

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Microprocessor I

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  1. Microprocessor I Including CPU, crystal, registers, binary numbers, EDB, RAM, Northbridge, & Address Bus

  2. The CPU • The man in a box allegory • To communicate with the CPU we use the External Data Bus • Series of switches (8) • 1 = on, 0 = off

  3. External Data Bus • We can send information to and receive information from the CPU via the External Data Bus • Why External? • The 8088 CPU had an 8 bit EDB while current CPUs have ?? bit EDBs

  4. Registers • The CPU has to temporarily store some data in the box • It uses registers to accomplish this • There are four registers

  5. Binary Numbers

  6. Crystal & Clock • Something needs to prompt the CPU as to when data on the bus should be dealt with • Too soon • Too late • The crystal keeps the time like a metronome

  7. Crystals • We can cause a crystal to vibrate by tapping on it physically or by applying a voltage • Even though we may strike the crystal once it will vibrate many times at a natural frequency • The first 8088 crystal vibrated at 4.77 MHz • Current crystals vibrate in the GHz • Did we improve crystals or CPUs?

  8. Crystal & Clock FAQs • The frequency rating of a CPU is its rated maximum. It does not always operate at this speed. • Over clocking causes the CPU to operate at speeds it is not rated for. This can cause the CPU to overheat and stop working (maybe permanently)

  9. Address Bus External Data Bus CPU>Northbridge>RAM

  10. The End

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