S-100 Bus {Obsolete interface bus.}

Sbus {IEEE-1496, a computer expansion card bus used with Sun work-stations. Sbus used a 32bit address and data bus running at 25MHz for data transfers of 100Mbps. Later increased to two 32 bit word transfers for a through-put of 200Mbps. Sbus is OBSOLETE, replaced by the PCI bus}

SCbus {The SCbus is based on the SCSA specification [Signal Computing System Architecture] as a stand-alone component, with a single distributed switching model. SCbus is a board-to-board 16 or 32 wire, bi-directional, bit-serial, TDM [Time Division Multiplexing] data bus developed for computer telephony. With a serial message bus for control and signaling. The SCbus capacity is 512, 1024 or 2048 [64kbit/s] time-slots depending on the clock frequency used. Any device may occupy any number of time slots [bundling]. The maximum physical bus length is 50cm over a flat cable. Up to 16 SCbus's can be connected together with SCxbus. SCbus is an ANSI standard.}

SCI Bus {Scalable Coherent Interface}; IEEE Std 1596-1992, SCI is a scalable network, nodes are interconnected in a point-to-point unidirectional link [ring]. The bandwidth grows with the number [concurrent] nodes used. SCI links are operate at 1 Gbps [serial], or 1 GBps [16-bit parallel], using a 250-MHz bi-phase clock over fiber optic or twisted-pair wires. Physical SCI controllers use LVDS signaling levels for 16 and 8 bit wide links.}

SCI Bus {Serial Communications Interface is an asynchronous serial communications bus used between uP [CPUs] and peripheral devices [EPROMs for example]. Two signal lines are used: TXD [Transmit], RXD [Receive], operating in Full-duplex.}

SCSI Bus {Small Computer Systems Interface Bus Parallel Interface, runs up to 12 meters.}

SDH {Synchronous Digital Hierarchy Links}

SDI {Serial Digital Interface, a video interface running over coax cable}

SDI {Serial Debug Interface. A Motorola cable interface used to debug hardware}

Sensor Buses {A type of Industrial Field Bus used to control sensors and transducers.}

SensorPath {Single wire interface.}

Serial ATA Bus {SATA; a four-wire Mother Board to Hard-drive serial data bus. Serial ATA uses only 4 signal pins. The 4 lines are used for transmitting and receiving differential pairs, plus an additional three grounds pins and a separate power pin. SATA has a maximum bus length of 1 meter with Data running at 150MBps, SATA uses LVDS}

Serial RapidIO Bus {Serial Rapid IO}

Serial SCSI Bus {Serial Attached SCSI [SAS] uses the SCSI protocol with a Serial ATA physical interface runing at 1.5Gbps or 3.0Gbps. SAS may soon replace parallel SCSI.}

Serial Storage Architecture Bus {SSA defines the physical medium, TTL differential drivers/receivers, clocking, connectors and cables. Runs in full duplex with 20MBps transfer rate in each direction [40MBps]. The max distance is 680 meters. OBSOLETE.}

SIM Card {The small card found in your cell phone that remembers your numbers and settings}

SIO (Scalable I/O former NGIO and FIO) by CACR consortium. Runs at 2.5 Gbit serial, or 0.5/2/6 GBps parallel (1/4/12 bits).

SmartCard Bus {ISO 7816 defines a plastic card used to store data via magnetic strip}

Smartmedia {Another Removable NAND-flash memory card format}

SMbus {System Management Bus is a two wire interface which is based on the I2C bus. SMbus operates at a frequency of 100KHz. SMbus is used to communicate between ICs, Temperature Sensors, Smart Battery Charges, and 'Smart' batteries.}

SMIC {Server Management Interface Chip}

SoC / IP Core Buses {System-On-Chip Bus for FPGAs, PLDs, or ASICs}

SONET {Synchronous Optical NETwork Links}

SPDIF {Sony/Philips Digital Interface used on digital audio consumer products}

SPI Buses {Links to the different buses using the term SPI as the bus name}

SPI Bus {Serial Peripheral Interface [SPI-bus] is a 4-wire serial communications [full-duplex] interface used by many microprocessor peripheral chips. SPI is a synchronous serial data link [1 megabaud] setup as a Master / Slave interface.}

SPI3 Bus {SONET Physical Layer Level 3}

SpringBoard {Handheld, out-dated}

sRIO {Serial Rapid IO}

SSFDC Bus {Solid State Floppy Disk Card}. The old name for Smartmedia}

SSI Bus {The Synchronous Serial Interface [SSI] bus consists of four signals; SCLK, SDATA, SDEN0, and SDEN1. SDATA is a bidirectional [three-state] data line which requires a pull-up or pull-down resistor. Data is sent in 8 bit bytes, LSB first. The SCLK signal is only active during transfers. Data is clocked out on the falling edge and clock in on the rising edge [of the Master]. The other two pins SDEN0 and SDEN1 are enable pins, active high.}

SSIF {SMBus System Interface. A low pin-count, option for the hardware interface that provides local access to the BMC via a connection to the system’s SMBus host controller.}

STBus {Serial Telcom Bus is a high speed, synchronous serial bus for transporting data in a digital format. Zarlink developed the STBus around 1995}

STD32 {8/16/32 bit TTL backplane bus running at 32MBps. This bus is out-dated.}

STEbus {STandard Eurocard, IEEE1000; 8 bit Data bus using TTL logic, with 20 Address lines. The STEbus came in either a 3U or 6U board format. A 1980 era bus, OBSOLETE}

SVGA {Super VGA offers more colors and resolutions than VGA.}

SwitchedFabric Buses {Definition-Links-Specifications}

STX PWBs {Smarter Technology eXtension SOM Module.}

SuperSpeed USB {The name given to revision 3.0 of the USB Specification. USB 3.0 has a data rate of 4.8 Gbit/s, 600 MB/s}

Next Section Electronic Buses 'T'
An alphabetic listing of released interface buses. Primarily the links point to pages that describe the physical and electrical interfaces. Interface Bus protocols are not addressed.