HyperTransport Technology Consortium announced today that is has approved HTX™, the industry’s first HyperTransport technology expansion connector specification. The new HyperTransport EATX Motherboard/Daughtercard Specification defines an interface and form factor specification for an EATX motherboard connector and HyperTransport add-in cards. The EATX motherboard is a popular architecture used in high-performance workstations, servers, embedded systems and storage systems. The new HyperTransport Consortium HTX slot standard is intended to accelerate the deployment of HyperTransport technology in the high-performance systems market by defining a standard HyperTransport expansion interface for use with popular motherboards and add-in cards.

HTX HyperTransport Expansion Interface

HyperTransport™ Technology Consortium, the nonprofit industry organization
that manages and promotes low-latency HyperTransport technology, announced today
that is has approved HTX™, the industry’s first HyperTransport technology
expansion connector specification. The new HyperTransport EATX Motherboard/Daughtercard
Specification defines an interface and form factor specification for an EATX
motherboard connector and HyperTransport add-in cards. The EATX motherboard is a
popular architecture used in high-performance workstations, servers, embedded
systems and storage systems. The new HyperTransport Consortium HTX slot standard
is intended to accelerate the deployment of HyperTransport technology in the
high-performance systems market by defining a standard HyperTransport expansion
interface for use with popular motherboards and add-in cards.

"The new HTX connector/daughtercard specification is an important milestone for
HyperTransport technology" states Brian Holden, Chairperson of the
HyperTransport ConsortiumTechnical Working Group. "It gives system and subsystem
manufacturers a standard way to attach HyperTransport-enabled subsystems to
HyperTransport-enabled motherboards. The high-throughput, low-latency
HyperTransport link is an integral part of many 64-bit motherboards and a key
interprocessor link for multiprocessor systems."

"This new standard is a result of key member company’s willingness to share
their work on designing and building advanced server systems," notes Mario
Cavalli, General Manager of the Consortium. "In particular we would like to
recognize Consortium members AMD, Iwill Corp. and PathScale, Inc., for their
significant contributions to the definition and validation of the HTX connector,
as well as for their decision to share their work with the rest of the industry
through the HyperTransport Consortium. The cooperation between AMD, Iwill,
PathScale and the Consortium is a model of how individual company interests can
be turned into shared community benefit using the Consortium."

"The HTX slot standard allows PathScale to leverage the low-latency,
high-bandwidth characteristics of HyperTransport technology in our high
performance InfiniPath™ HTX Adapter and to achieve the industry’s absolute
lowest latency cluster computing interconnect," said Len Rosenthal, Vice
President of Marketing for PathScale, Inc. "We are pleased that the Consortium
agreed to make the HyperTransport HTX connector a Consortium standard. This will
lead to its widespread industry adoption and will accelerate deployment of the
HyperTransport technology in the high performance computing market segment."

"HyperTransport technology is a premium technology for high performance
computing," said David Montgomery, Director, Technology Development for Iwill
Corporation. "We have developed our advanced HTX-Pro™ HyperTransport expansion
technology to support this low-latency link. Consortium-approved standard HTX™
add-in cards such as the new PathScale InfiniPath cluster interconnect that
interoperate with Iwill HTX-Pro technology will help OEMs quickly assemble high
performance systems and subsystems without the cost of developing proprietary
motherboard designs."

The HyperTransport HTX Motherboard/Daughtercard specification defines an 8- or
16-bit HyperTransport interface with an up to 1.6 gigatransfer/second data rate
(800 MHz clock rate) and includes all of the defined HyperTransport control
signals including a synchronous reference clock. The connector signals include
both 12V and 3.3V power signals, a SMBus interface (3.3V), optionally supports
JTAG and enables the use of 4-layer motherboards and daughtercards with
conventional PCB technology.

The new HTX specification is optionally compatible with the standard Extended
ATX (12" x 13") motherboard form factor. The daughtercard mechanical envelop is
compatible with standard PCI cards to fit in existing chassis designs. The HTX
components are designed to be used in both riser-based (1U) and pedestal,
rack-mount (3U and greater) and proprietary systems. The placement of the
connectors are designed to exclude the possibility of accidentally inserting
cards built to other known interface specification. The specification defines
the mechanical locations of the connectors, pinouts, signaling conventions,
mechanical specifications for the 1U riser card and the HyperTransport
daughtercard, and layout rules for motherboard, riser, and daughtercard.