MGMT 1030 Lecture Notes - Lecture 8: Serial Ata, Pci Express
6 May 2018
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MGMT 1030 Lecture 8 Notes – Buses are Dependent
Introduction
• The characteristics of buses are dependent on their particular use within the computer
environment.
• A bus can be characterized by the number of separate wires or optical conductors in the
bus
• By its throughput, that is, the data transfer rate measured in bits per second
• By the data width (in bits) of the data being carried; by the number and type of
attachments that the bus can support
• By the distance between the two end points
• By the type of control required; by the defined purpose of the bus
• By the addressing capacity
• By whether the lines on the bus are uniquely defined for a single type of signal or shared
• By the various features and capabilities that the bus provides.
• The bus must also be specified electrically and mechanically
• By the voltages used
• By the timing and control signals that the bus provides, by the protocol used to operate
and control the bus, by the number of pins on the connectors, if any.
• Even by the size of the cards that plug into the connector.
• A bus would not be very useful if the cards that it was to interconnect did not fit into the
space allotted!
• Unfortunately for the concept of standardization, there are dozens of different buses in
use, although a few are far more common than others.
• The need to characterize buses comes from the necessity of interfacing the bus to other
components that are part of the computer system.
• Buses that are internal to the CPU are usually not characterized formally at all, since
they serve special purposes and do not interface to the outside world.
• Buses that are used in this way are sometimes known as dedicated buses.
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