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<title>Multidrop bus</title>

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<span id="openzim-page-title" class="mw-page-title-main"><span class="mw-page-title-main">Multidrop bus</span></span>

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<p>A <b>multidrop bus</b> (<b>MDB</b>) is a <a href="Computer_bus" class="mw-redirect" title="Computer bus">computer bus</a> able to connect three or more devices. A process of <a href="Arbiter_(electronics)" title="Arbiter (electronics)">arbitration</a> determines which device sends information at any point. The other devices listen for the data they are intended to receive.

</p><p>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.

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<div class="mw-heading mw-heading2"><h2 id="In_computing">In computing</h2></div>

<p>Since 2000, multidrop standards such as <a href="Peripheral_Component_Interconnect" title="Peripheral Component Interconnect">PCI</a> and <a href="Parallel_ATA" title="Parallel ATA">Parallel ATA</a> are increasingly being replaced by <a href="Network_topology#Point-to-point" title="Network topology">point-to-point</a> systems such as <a href="PCI_Express" title="PCI Express">PCI Express</a> and <a href="SATA" title="SATA">SATA</a>. Modern <a href="SDRAM" class="mw-redirect" title="SDRAM">SDRAM</a> chips exemplify the problem of <a href="Signal_reflection" title="Signal reflection">electrical impedance discontinuity</a>. <a href="Fully_Buffered_DIMM" title="Fully Buffered DIMM">Fully Buffered DIMM</a> is an alternative approach to connecting multiple <a href="DRAM" class="mw-redirect" title="DRAM">DRAM</a> modules to a memory controller.

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<div class="mw-heading mw-heading2"><h2 id="For_vending_machines">For vending machines</h2></div>

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</style><div role="note" class="hatnote navigation-not-searchable">Main article: <a href="Multi-Drop_Bus_/_Internal_Communication_Protocol" title="Multi-Drop Bus / Internal Communication Protocol">Multi-Drop Bus / Internal Communication Protocol</a></div>

<p>MDB/ICP (formerly known as MDB) is a multidrop bus computer networking protocol used within the vending machine industry, currently published by the American <a href="National_Automatic_Merchandising_Association" title="National Automatic Merchandising Association">National Automatic Merchandising Association</a>.

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<div class="mw-heading mw-heading3"><h3 id="ccTalk">ccTalk</h3></div>

<div role="note" class="hatnote navigation-not-searchable">Main article: <a href="CcTalk" title="CcTalk">ccTalk</a></div>

<p>The ccTalk multidrop bus protocol uses an <span class="nowrap">8 bit</span> <a href="Transistor%E2%80%93transistor_logic" title="Transistor–transistor logic">TTL-level</a> <a href="Asynchronous_serial_communication" title="Asynchronous serial communication">asynchronous serial protocol</a>. 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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<ul><li><a href="Network_topology#Bus" title="Network topology">Bus network topology</a></li>

<li><a href="Open_collector" title="Open collector">Open collector</a></li>

<div class="mw-heading mw-heading2"><h2 id="External_links">External links</h2></div>

<ul><li><a rel="nofollow" class="external text" href="http://www.research.ibm.com/journal/rd/494/benner.html">IBM Journal of Research and Development</a></li></ul>

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</style><div id="Technical_and_de_facto_standards_for_wired_computer_buses462" style="font-size:114%;margin:0 4em"><a href="Technical_standard" title="Technical standard">Technical</a> and <a href="De_facto_standard" title="De facto standard"><i>de facto</i> standards</a> for <a href="Wired_communication" title="Wired communication">wired</a> <a href="Bus_(computing)" title="Bus (computing)">computer buses</a></div></th></tr><tr><th scope="row" class="navbox-group" style="width:1%">General</th><td class="navbox-list-with-group navbox-list navbox-odd hlist" style="width:100%;padding:0"><div style="padding:0 0.25em">

<ul><li><a href="System_bus" title="System bus">System bus</a></li>

<li><a href="Front-side_bus" title="Front-side bus">Front-side bus</a></li>

<li><a href="Daisy_chain_(electrical_engineering)" title="Daisy chain (electrical engineering)">Daisy chain</a></li>

<li><a href="Control_bus" title="Control bus">Control bus</a></li>

<li><a href="Address_bus" class="mw-redirect" title="Address bus">Address bus</a></li>

<li><a href="Bus_contention" title="Bus contention">Bus contention</a></li>

<li><a href="Bus_mastering" title="Bus mastering">Bus mastering</a></li>

<li><a href="Network_on_a_chip" title="Network on a chip">Network on a chip</a></li>

<li><a href="List_of_interface_bit_rates#Computer_buses" title="List of interface bit rates">List of bus bandwidths</a></li></ul>

</div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%">Standards</th><td class="navbox-list-with-group navbox-list navbox-even hlist" style="width:100%;padding:0"><div style="padding:0 0.25em">

<li><a href="Multibus" title="Multibus">Multibus</a></li>

<li><a href="Unibus" title="Unibus">Unibus</a></li>

<li><a href="VAXBI_bus" class="mw-redirect" title="VAXBI bus">VAXBI</a></li>

<li><a href="System_Management_Bus" title="System Management Bus">SMBus</a></li>

<li><a href="Europe_Card_Bus" title="Europe Card Bus">Europe Card Bus</a></li>

<li><a href="STEbus" title="STEbus">STEbus</a></li>

<li><a href="Zorro_II" title="Zorro II">Zorro II</a></li>

<li><a href="Zorro_III" title="Zorro III">Zorro III</a></li>

<li><a href="Computer_Automated_Measurement_and_Control" title="Computer Automated Measurement and Control">CAMAC</a></li>

<li><a href="FASTBUS" title="FASTBUS">FASTBUS</a></li>

<li><a href="HP_Precision_Bus" title="HP Precision Bus">HP Precision Bus</a></li>

<li><a href="NuBus" title="NuBus">NuBus</a></li>

<li><a href="TURBOchannel" title="TURBOchannel">TURBOchannel</a></li>

<li><a href="InfiniBand" title="InfiniBand">InfiniBand</a></li>

<li><a href="Ethernet" title="Ethernet">Ethernet</a></li>

<li><a href="PCI-X" title="PCI-X">PCI Extended (PCI-X)</a></li>

<li><a href="PCI_Express" title="PCI Express">PCI Express (PCIe)</a></li>

<li><a href="Compute_Express_Link" title="Compute Express Link">Compute Express Link (CXL)</a></li>

<li><a href="Direct_Media_Interface" title="Direct Media Interface">Direct Media Interface (DMI)</a></li>

<li><a href="RapidIO" title="RapidIO">RapidIO</a></li>

<li><a href="Intel_QuickPath_Interconnect" title="Intel QuickPath Interconnect">Intel QuickPath Interconnect</a></li>

<li><a href="NVLink" title="NVLink">NVLink</a></li>

<li><a href="HyperTransport" title="HyperTransport">HyperTransport</a>

<ul><li><a href="Infinity_Fabric" class="mw-redirect" title="Infinity Fabric">Infinity Fabric</a></li></ul></li>

<li><a href="Intel_Ultra_Path_Interconnect" title="Intel Ultra Path Interconnect">Intel Ultra Path Interconnect</a></li>

<li><a href="Coherent_Accelerator_Processor_Interface" title="Coherent Accelerator Processor Interface">Coherent Accelerator Processor Interface (CAPI)</a></li>

<li><a href="SpaceWire" title="SpaceWire">SpaceWire</a></li></ul>

</div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%">Storage</th><td class="navbox-list-with-group navbox-list navbox-odd hlist" style="width:100%;padding:0"><div style="padding:0 0.25em">

<li><a href="Floppy_disk_drive_interface" title="Floppy disk drive interface">Floppy connector</a></li>

<li><a href="Parallel_ATA" title="Parallel ATA">Parallel ATA (PATA)</a></li>

<li><a href="HIPPI" title="HIPPI">HIPPI</a></li>

<li><a href="SATA" title="SATA">Serial ATA (SATA)</a></li>

<ul><li><a href="Parallel_SCSI" title="Parallel SCSI">Parallel</a></li>

<li><a href="ESCON" title="ESCON">ESCON</a></li>

<li><a href="Fibre_Channel" title="Fibre Channel">Fibre Channel</a></li>

<li><a href="SATA_Express" title="SATA Express">SATAe</a></li>

<li>PCI Express (via <a href="Advanced_Host_Controller_Interface" title="Advanced Host Controller Interface">AHCI</a> or <a href="NVM_Express" title="NVM Express">NVMe</a> logical device interface)</li></ul>

</div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%">Peripheral</th><td class="navbox-list-with-group navbox-list navbox-even hlist" style="width:100%;padding:0"><div style="padding:0 0.25em">

<ul><li><a href="Apple_Desktop_Bus" title="Apple Desktop Bus">Apple Desktop Bus</a></li>

<li><a href="Atari_SIO" title="Atari SIO">Atari SIO</a></li>

<li><a href="Commodore_bus" title="Commodore bus">Commodore bus</a></li>

<li><a href="Lightning_(connector)" title="Lightning (connector)">Lightning</a></li>

<li><a href="IEEE_1284" title="IEEE 1284">IEEE-1284 (parallel port)</a></li>

<li><a href="IEEE_1394" title="IEEE 1394">IEEE-1394 (FireWire)</a></li>

<li><a href="I%C2%B2C" title="I²C">I²C</a> (<a href="ACCESS.bus" title="ACCESS.bus">ACCESS.bus</a>, <a href="Power_Management_Bus" title="Power Management Bus">PMBus</a>, <a href="System_Management_Bus" title="System Management Bus">SMBus</a>)</li>

<li><a href="Parallel_SCSI" title="Parallel SCSI">Parallel SCSI</a></li>

<li><a href="Profibus" title="Profibus">Profibus</a></li>

<li><a href="Camera_Link" title="Camera Link">Camera Link</a></li>

<li><a href="PCI_Express#PCI_Express_External_Cabling" title="PCI Express">External PCIe</a></li>

<li><a href="Thunderbolt_(interface)" title="Thunderbolt (interface)">Thunderbolt</a></li>

</div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%">Audio</th><td class="navbox-list-with-group navbox-list navbox-odd hlist" style="width:100%;padding:0"><div style="padding:0 0.25em">

<ul><li><a href="ADAT_Lightpipe" title="ADAT Lightpipe">ADAT Lightpipe</a></li>

<li><a href="Intel_High_Definition_Audio" title="Intel High Definition Audio">Intel HD Audio</a></li>

<li><a href="McASP" title="McASP">McASP</a></li>

<li><a href="TOSLINK" title="TOSLINK">TOSLINK</a></li></ul>

</div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%">Portable</th><td class="navbox-list-with-group navbox-list navbox-even hlist" style="width:100%;padding:0"><div style="padding:0 0.25em">

<li><a href="ExpressCard" title="ExpressCard">ExpressCard</a></li></ul>

</div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%">Embedded</th><td class="navbox-list-with-group navbox-list navbox-odd hlist" style="width:100%;padding:0"><div style="padding:0 0.25em">

<ul>

<li><a href="CoreConnect" title="CoreConnect">CoreConnect</a></li>

<li><a href="Wishbone_(computer_bus)" title="Wishbone (computer bus)">Wishbone</a></li>

<li><a href="SLIMbus" title="SLIMbus">SLIMbus</a></li></ul>

</div></td></tr><tr><td class="navbox-abovebelow" colspan="2"><div>Interfaces are listed by their speed in the (roughly) ascending order, so the interface at the end of each section should be the fastest.<br><span class="noviewer" typeof="mw:File"><span title="Category"></span></span> Category</div></td></tr></tbody></table></div></div><div><div class="zim-footer">

This article is issued from <a class="external text" title="Last edited on 2025-05-04" href="https://en.wikipedia.org/wiki/?title=Multidrop_bus&oldid=1288805869">Wikipedia</a>. The text is available under <a class="external text" href="https://creativecommons.org/licenses/by-sa/4.0/deed.en">Creative Commons Attribution-Share Alike 4.0</a> unless otherwise noted. Additional terms may apply for the media files.

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