internet.com
You are in the: Small Business Computing Channelarrow View Sites +
Small Business Technology
» ECommerce-Guide | Small Business Computing | Webopedia | WinPlanet |  »Close
Webopedia.com
Enter a word for a definition... ...or choose a computer category.
 
 

menu
   Home
   Term of the Day
   New Terms
   Pronunciation
   New Links
   Quick Reference
   Did You Know?
   Categories
   Tech Support
   Webopedia Jobs
   About Us
   Link to Us
   Advertising
  

talk to us
   Submit a URL
   Suggest a Term
   Report an Error

internet.com
Developer
International
Internet Lists
Internet News
Internet Resources
IT
Linux/Open Source
Personal Technology
Small Business
Windows Technology
xSP Resources
Search internet.com
Advertise
Corporate Info
Newsletters
Tech Jobs
E-mail Offers
commerce
  Be a Commerce Partner
 
 
 
 
 
 
 
 
 
 
 
 
 
 

SPI
Last modified: Tuesday, August 02, 2005 

(1) Short for Serial Peripheral Interface, a full-duplex synchronous serial interface for connecting low-/medium-bandwidth external devices using four wires. SPI devices communicate using a master/slave relationship over two data lines and two control lines:

  • Master Out Slave In (MOSI): supplies the output data from the master to the inputs of the slaves.
  • Master In Slave Out (MISO): supplies the output data from a slave to the input of the master. It is important to note that there can be no more than one slave that is transmitting data during any particular transfer.
  • Serial Clock (SCLK): a control line driven by the master, regulating the flow of data bits.
  • Slave Select (SS): a control line that allows slaves to be turned on and off with hardware control.

(2) Short for System Packet Interface, a point-to-point interface standard, allows network equipment designers to develop an array of next-generation multi-service switches and routers to support multi-service traffic with aggregate bandwidths up to OC-192 (10 Gb/s) and beyond, enabling them to dramatically increase system performance. It is a family of Interoperability Agreements from the Optical Internetworking Forum (OIF) which include:

  • System Packet Interface Level 5 (SPI-5): OC-768 System Interface for Physical and Link Layer Devices. (OIF documentation)
  • System Packet Interface Level 4 (SPI-4) Phase 2: OC-192 System Interface for Physical and Link Layer Devices.(OIF documentation)
  • System Physical Interface Level 4 (SPI-4) Phase 1: A System Interface for Interconnection Between Physical and Link Layer, or Peer-to-Peer Entities Operating at an OC-192 Rate (10 Gb/s)  (OIF documentation)
  • System Packet Interface Level 3: OC-48 System Interface for Physical and Link Layer Devices (OIF documentation)

E-mail this definition to a colleague

Sponsored listings

Hoover's: SPI Dynamics, Inc. Company Research - Find information on SPI Dynamics, Inc. with operations and products, financials, officers, competitors and more at Hoover's.


For internet.com pages about SPI . Also check out the following links!

Related Links

related categories

Buses

Peripheral Devices

related terms

interface

master/slave

peripheral device


webopedia
Give Us Your
Feedback


Firewalls
SPI Products


Shop by Top Models:
SonicWALL (01-SSC-5700) Pro 2040 Firewall
22 store offers from $1295 - $1870

D-Link NetDefend DFL-700 (DHDFL700) Firewall
16 store offers from $301 - $371

WatchGuard Technologies FireBox X500 (wg40500) Firewall
23 store offers from $1109 - $1989

NetGear ProSafe™ FVG318 (606449041668) Firewall
5 store offers from $120 - $129

Cisco (PIX-506E-BUN-K9) Firewall
23 store offers from $772 - $1123



JupiterWeb networks:

internet.comearthweb.comDevx.com graphics.com

Search JupiterWeb:

Jupitermedia Corporation has two divisions:
Jupiterimages andJupiterWeb


Legal Notices, Licensing, Reprints, & Permissions, Privacy Policy.

Jupitermedia Corporate Info | Newsletters | Tech Jobs | Shopping | E-mail Offers