MGMT 1030 Lecture Notes - Lecture 13: Data Corruption
6 May 2018
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MGMT 1030 Lecture 13 Notes – Interference
Introduction
• The higher the data rate, the worse the interference, which ultimately limits the speed
at which the parallel bus can operate.
• Additionally, there is a slight difference in time delay on different lines, known as skew,
as signals traverse the bus.
• The transfer rate, and thus the clock speed of the bus, is also limited by the requirement
that the data must not change faster than the maximum skew time.
• Both of these problems can cause data corruption.
• Finally, the cost of fiber optic technology makes a parallel optical cable impractical.
• Data on a serial bus is transferred sequentially, one bit at a time.
• Although you might think that the throughput of a serial bus would be lower than that
of a parallel bus theoretically capable of the same per line transfer rate, the limitations
noted above make serial bus transmission attractive in many circumstances.
• Indeed, with advances in serial bus technology, serial buses are now preferred for many,
if not most, applications requiring high data transfer rates.
• Generally, a serial bus has a single data line pair and perhaps a few control lines.
• For simultaneous two-way communication, a second data line pair can be added.
• There are no separate address lines in a serial bus.
• Serial buses are often set up for point-to-point connection
• No addressing is required in this case. If addressing is required in a serial bus
application, the address may be multiplexed with the data.
• What this means is that the same line is used for both address and data at different
times
• If an address is required, for example, the address might be sent first, one bit at a time,
followed by the data.
• At its simplest, the serial bus can be reduced to a single data line pair, used for data,
control, and addressing.
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