Amultidrop bus (MDB) is acomputer bus able to connect three or more devices. A process ofarbitration 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.
Since 2000,[citation needed] multidrop standards such asPCI andParallel ATA are increasingly being replaced bypoint-to-point systems such asPCI Express andSATA. ModernSDRAM chips exemplify the problem ofelectrical impedance discontinuity.[clarification needed]Fully Buffered DIMM is an alternative approach to connecting multipleDRAM modules to a memory controller.
MDB/ICP (formerly known as MDB) is a multidrop bus computer networking protocol used within the vending machine industry, currently published by the AmericanNational Automatic Merchandising Association.
The ccTalk multidrop bus protocol uses an8 bitTTL-levelasynchronous 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.
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Interfaces are listed by their speed in the (roughly) ascending order, so the interface at the end of each section should be the fastest.  Category | |