Bus contention

Source: Wikipedia, the free encyclopedia.
Not to be confused with resource contention.

Bus contention is an undesirable state in

computer design where more than one device on a bus
attempts to place values on it at the same time.

Bus contention is the kind of telecommunication contention that occurs when all communicating devices communicate directly with each other through a single shared channel, and contrasted with "network contention" that occurs when communicating devices communicate indirectly with each other, through point-to-point connections through routers or bridges.[1][failed verification]

Bus contention can lead to erroneous operation, excess power consumption, and, in unusual cases, permanent damage to the hardware—such as burning out a MOSFET.[2]

Description

Most bus architectures requires devices sharing a bus to follow an arbitration protocol carefully designed to make the likelihood of contention negligible.

memory mapping when illegal values are written to the registers
controlling the mapping. Most small-scale computer systems are carefully designed to avoid bus contention on the
three-state bus[2]
with a bus arbiter.

Some networks, such as Token Ring, are also designed to avoid bus contention, so bus contention never happens in normal operation.

Most networks are designed with hardware robust enough to tolerate occasional bus contention on the network.

packet collision
.

See also

References

  1. ^ Theodoros Konstantakopoulos, Jonathan Eastep, James Psota, and Anant Agarwal. "Energy Scalability of On-Chip Interconnection Networks in Multicore Architectures".
  2. ^ a b Ian Sinclair; John Dunton. "Practical Electronics Handbook" 2013. section "Three-state control". p. 208.
  3. ISBN 0-13-852872-1
    .
Retrieved from "https://en.wikipedia.org/w/index.php?title=Bus_contention&oldid=1086725458"