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SFF-8452

Specification

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Published SFF-8452 Rev 3.1

Glitch Free Multidrop Connections Page 1

SFF Committee documentation may be purchased in hard copy or electronic form.

SFF specifications are available at ftp://ftp.seagate.com/sff

READ EDITOR'S NOTES IN FRONT OF TABLE OF CONTENTS

SFF Committee

SFF-8452 Specification for

Glitch Free Mating Connections for Multidrop Aps

Rev 3.1 June 19, 2001

Secretariat: SFF Committee

Abstract: This document defines the physical interface and performance requirements

for glitch free mating connections used in multidrop applications such as parallel

SCSI and PCI. A specific example is given for required modifications to SCA-2

(Single Connector Attach -2) free gender (plug) connectors to achieve glitch free

mating and unmating. Other uses of this general-purpose connection system are also

possible.

This document provides a common specification for systems manufacturers, system

integrators, and suppliers of magnetic disk drives. This is an internal working

document of the SFF Committee, an industry ad hoc group.

This document is made available for public review, and written comments are

solicited from readers. Comments received by the members will be considered for

inclusion in future revisions of this document.

The description of a connector in this document does not assure that the specific

component is actually available from connector suppliers. If such a connector is

supplied it must comply with this specification to achieve interoperability between

suppliers.

Support: This document is supported by the identified member companies of the SFF

Committee.

Documentation: This document has been prepared in a similar style to that of the ISO

(International Organization of Standards).

POINTS OF CONTACT:

Bill Ham I. Dal Allan

Compaq Computer Chairman SFF Committee

334 South St 14426 Black Walnut Court

Shrewsbury, MA 01545 Saratoga CA 95070

Ph: 978 828-9102 Fx: 508-841-5266 Ph: 408-867-6630 Fx: 408-867-2115

Email: Bill_Ham@compaq.com endlcom@acm.org

Published SFF-8452 Rev 3.1

Glitch Free Multidrop Connections Page 3

If you are not a member of the SFF Committee, but you are interested in

participating, the following principles have been reprinted here for your

information.

PRINCIPLES OF THE SFF COMMITTEE

The SFF Committee is an ad hoc group formed to address storage industry needs in a

prompt manner. When formed in 1990, the original goals were limited to defining de

facto mechanical envelopes within which disk drives can be developed to fit compact

computer and other small products.

Adopting a common industry size simplifies the integration of small drives (2 1/2"

or less) into such systems. Board-board connectors carrying power and signals, and

their position relative to the envelope are critical parameters in a product that

has no cables to provide packaging leeway for the integrator.

In November 1992, the SFF Committee objectives were broadened to encompass other

areas which needed similar attention, such as pinouts for interface applications,

and form factor issues on larger disk drives. SFF is a forum for resolving industry

issues that are either not addressed by the standards process or need an immediate

solution.

Documents created by the SFF Committee are expected to be submitted to bodies such

as EIA (Electronic Industries Association) or an ASC (Accredited Standards

Committee). They may be accepted for separate standards, or incorporated into other

standards activities.

The principles of operation for the SFF Committee are not unlike those of an

accredited standards committee. There are 3 levels of participation:

- Attending the meetings is open to all, but taking part in discussions is

limited to member companies, or those invited by member companies

- The minutes and copies of material which are discussed during meetings

are distributed only to those who sign up to receive documentation.

- The individuals who represent member companies of the SFF Committee

receive documentation and vote on issues that arise. Votes are not taken

during meetings, only guidance on directions. All voting is by letter

ballot, which ensures all members an equal opportunity to be heard.

Material presented at SFF Committee meetings becomes public domain. There are no

restrictions on the open mailing of material presented at committee meetings. In

order to reduce disagreements and misunderstandings, copies must be provided for all

agenda items that are discussed. Copies of the material presented, or revisions if

completed in time, are included in the documentation mailings.

The sites for SFF Committee meetings rotate based on which member companies

volunteer to host the meetings. Meetings have typically been held during the ASC T10

weeks.

The funds received from the annual membership fees are placed in escrow, and are

used to reimburse ENDL for the services to manage the SFF Committee.

Published SFF-8452 Rev 3.1

Glitch Free Multidrop Connections Page 5

Foreword

When 2 1/2" diameter disk drives were introduced, there was no commonality on

external dimensions e.g. physical size, mounting locations, connector type,

connector location, between vendors.

The first use of these disk drives was in specific applications such as laptop

portable computers in which space was at a premium and time to market with the

latest machine was an important factor. System integrators worked individually with

vendors to develop the packaging. The result was wide diversity, and with space

being such a major consideration in packaging, it was not possible to replace one

vendor's drive with a competitive product.

The desire to reduce disk drive sizes to even smaller dimensions such as 1.8" and

1.3" made it likely that devices would become even more constrained in dimensions

because of a possibility that such small devices could be inserted into a socket,

not unlike the method of retaining semiconductor devices.

The problems faced by integrators, device suppliers, and component suppliers led to

the formation of an industry ad hoc group to address the marketing and engineering

considerations of the emerging new technology in disk drives. After two informal

gatherings on the subject in the summer of 1990, the SFF Committee held its first

meeting in August.

During the development of the form factor definitions, other activities were

suggested because participants in the SFF Committee faced problems other than the

physical form factors of disk drives. In November 1992, the members approved an

expansion in charter to address any issues of general interest and concern to the

storage industry. The SFF Committee became a forum for resolving industry issues

that are either not addressed by the standards process or need an immediate

solution.

At the same time, the principle was adopted of restricting the scope of an SFF

project to a narrow area, so that the majority of documents would be small and the

projects could be completed in a rapid timeframe. If proposals are made by a number

of contributors, the participating members select the best concepts and uses them to

develop specifications which address specific issues in emerging storage markets.

Those companies which have agreed to support a documented specification are

identified in the first pages of each SFF Specification. Industry consensus is not

an essential requirement to publish an SFF Specification because it is recognized

that in an emerging product area, there is room for more than one approach. By

making the documentation on competing proposals available, an integrator can examine

the alternatives available and select the product that is felt to be most suitable.

Suggestions for improvement of this document will be welcome. They should be sent to

the SFF Committee, 14426 Black Walnut Ct, Saratoga, CA 95070.

The development work on this specification was done by the SFF Committee, an

industry group. The membership of the committee since its formation in 1990 has

included a mix of companies which are leaders across the industry.

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