MGMT 1030 Lecture Notes - Lecture 7: Printed Circuit Board
6 May 2018
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MGMT 1030 Lecture 7 Notes – Physical Connection
Introduction
• The differet fors that the data a take ilude istrutios ad addresses, i
addition to actual numerical data.
• Data oes etee the arious I/O odules, eory, ad the CPU i siilar
fashion.
• The physical connection that makes it possible to transfer data from one location in the
computer system to another is called a bus.
• From our previous discussion of the way that the CPU and memory work together
• It is probably already obvious to you that there must be a bus of some kind linking the
CPU and memory
• Similarly, buses internal to the CPU can be used to link registers together at the proper
times to implement the fetch-execute cycles introduced
• Specifically, a bus may be defined as a group of electrical, or, less commonly, optical,
conductors suitable for carrying computer signals from one location to another.
• The electrical conductors may be wires, or they may be conductors on a printed circuit.
• Optical conductors work similarly, using light that is directed from point to point in
special thin clear glass fibers.
• Optical conductors can carry data much faster than electrical conductors, but their cost
is high, which has limited their use to date.
• Nonetheless, there is considerable lab research into ways to integrate more optical
circuits into computers.
• Buses are used most commonly for transferring data between computer peripherals
• The CPU, for transferring data between the CPU and memory, and for transferring data
between different points within the CPU.
• A bus might be a tiny fraction of an inch long, carrying data between various parts of the
CPU within an integrated circuit chip
• It might be a few inches long, carrying data between the CPU chip and memory
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