IEEE
Approves Amendment to IEEE 1394™ Standard for
High-Speed Serial Buses Allowing Gigabit Signaling
New Standard Extends Connectivity to 100 Meters
in Many Interconnect Media
Contact:
David Wooten, +1 858 613 5502, wd@cypress.com
or
Karen McCabe, +1 732 562 3824, k.mccabe@ieee.org
For Release:
Immediate
(PISCATAWAY,
NJ, 2 April 2002) The Institute of Electrical and Electronics
Engineers Standards Association (IEEE-SA) Standards Board has
approved IEEE Standard 1394b, "High-Performance Serial Bus,"
which amends the IEEE 1394-1995 and IEEE 1394a-2000 standards.
IEEE 1394b upgrades the prior standards by allowing for gigabit
signaling and by extending signaling distance to 100 meters (vs.
4.5 meters in IEEE 1394-1995) in data storage, home network backbones
and other systems.
The IEEE 1394-1995
standard was widely deployed and many digital consumer and non-consumer
products based their primary external interface on it. IEEE 1394b
expands the number and type of devices that can use this standard.
The amendment also supports a broader range of interconnect media,
from CAT5 unshielded twisted pairs and UTP5 to glass and plastic
optical fiber. It allows for cable lengths of 50 meters for plastic
optical fiber cables and 100 meters for glass optical fiber cables.
It also supports SIN S100 (100Mb/s) operation over CAT-5 at lengths
to 100 meters.
Under the
new amendment, high-speed serial buses integrate with most IEEE
standard 34-bit and 64-bit parallel buses, which enables low-cost
interconnection among external peripherals. The new amendment
is fully interoperable with 1394a-2000 and 1394-1995 for 6-pin
and 4-pin connectors. It extends bus speeds to S800 and S1600,
and has architectural support for S3200.
IEEE 1394b
supports data/strobe signaling and the speeds inherent in IEEE
1394a-2000 and 1394-1995. It also adds beta-mode signaling for
much higher data rates between beta-mode ports. For copper-cable
connections shorter than 5 meters, ports on the PHY developed
for IEEE 1394b can signal by either data-strobe or beta mode.
These ports select the optimum connection method.
The new signaling
system also provides for scalability as signaling rate increases
and allows data transmission to overlap the transmission of arbitration
signals in the reverse direction, which eliminates arbitration
gaps in 1394b buses. In addition, a bus with all connections operating
in beta mode is completely self-timed and does not need a setting
for gap count.
The IEEE 1394b
standard covers such elements as: cables and connectors for gigabit
signaling; detection and resolution of physical loops in bus topology;
circuit design for transmitting 8b/10b encoded signals; extension
of the PHY/link interface for higher data rates over either an
8-bit parallel or bit-serial bus; protocols to encode bus arbitration
signals as symbols; protocols for signal speed negotiation between
peer devices; and testing and compliance procedures for gigabit
connections.
The amendment
was sponsored by the Microprocessor and Microcomputer Standards
Committee of the IEEE Computer Society. For more information on
IEEE Microprocessor Standards, visit the IEEE
Microprocessor Standards Zone or the IEEE
MSC homepage.
About the
IEEE Standards Association
The IEEE Standards Association (IEEE-SA) is an international membership
organization serving today's industries with a complete portfolio
of standards programs. The IEEE-SA is a major contributor to the
IEEE, which is the world's largest technical professional society.
IEEE-SA membership, through its IEEE association, promotes the
engineering process by creating, developing, integrating, sharing
and applying knowledge about electro- and information technologies
and sciences for the benefit of humanity and the profession. More
information is found at http://standards.ieee.org/sa-mem/index.html
IEEE
1394, 1394a, 1394b are trademarks of the IEEE. All other names
or product names are the trademarks, service marks or registered
trademarks of their respective holders.
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