SASI {The original acronym for SCSI before the standard was controlled by ANSI.}

S-100 Bus {Obsolete interface bus used with early computers.}

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 Sbus is OBSOLETE, replaced by the PCI bus.}

SBW {Spy-Bi-Wire is a serialized JTAG protocol developed by Texas Instruments for their MSP430 micro controllers. There are two interface connections; a bidirectional data output, and a clock. The clocking signal is split into a period of three clock pulses, for each clock pulse the TDI, TDO and TMS signals are passed on the micro controller via the bidirectional data output.}

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.}

Serial Wire Debug (An alternate name for SWD. See Single Wire Debug).

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.}

StackableUSB {Standard 2.0 USB interface that is board-stackble using USB connectors, but no USB cables.}

STANAG4575 NATO Standard Agreement Interface bus based on Fiber Channel, also called NADSI.

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

STbus Interconnect {An IP bus used by STMicroelectronics to interconnect IP Cores, of any data width, clock frequency and complexity, in a system-on-chip.}

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}

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}

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

SwitchedFabric Buses {Definition-Links-Specifications}

SWD Description {Single Wire Debug; A two wire debug bus}