A multidrop bus (MDB) is a
computer bus in which all components are connected to the electrical circuit. A process of
arbitration determines which device sends information at any point. The other devices listen for the data they are intended to receive.
Multidrop buses have the advantage of simplicity and extensibility, but their differing electrical characteristics make them relatively unsuitable for high frequency or high bandwidth applications.
In computing
Since 2000, multidrop standards such as
PCI and
Parallel ATA are increasingly being replaced by
point-to-point systems such as
PCI Express and
SATA. Modern
SDRAM chips exemplify the problem of
electrical impedance discontinuity.
Fully Buffered DIMM
Fully Buffered DIMM (or FB-DIMM) is a memory technology that can be used to increase reliability and density of memory systems. Unlike the parallel bus architecture of traditional DRAMs, an FB-DIMM has a serial interface between the memory contro ...
is an alternative approach to connecting multiple
DRAM modules to a memory controller.
For vending machines
MDB/ICP
MDB/ICP (formerly known as MDB) is a multidrop bus computer networking protocol used within the vending machine industry, currently published by the American
National Automatic Merchandising Association.
ccTalk
The ccTalk multidrop bus protocol uses an
TTL-level asynchronous serial protocol. It uses address randomization to allow multiple similar devices on the bus (after randomisation the devices can be distinguished by their serial number). ccTalk was developed by CoinControls, but is used by multiple vendors.
See also
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Bus network topology
*
EIA-485
*
1-Wire
1-Wire is a device communications bus system designed by Dallas Semiconductor Corp. that provides low-speed (16.3 kbit/s) data, signaling, and power over a single conductor.
1-Wire is similar in concept to I²C, but with lower data rates and ...
*
Open collector
External links
IBM Journal of Research and Development
{{DEFAULTSORT:Multidrop Bus
Computer buses