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Published SFF-8485 Revision 0.7
Serial GPIO Bus 1
SFF Committee documentation may be purchased in electronic form.
SFF specifications are available at ftp://ftp.seagate.com/sff.
SFF Committee
SFF-8485 Specification for
Serial GPIO (SGPIO) Bus
Revision 0.7
1 February 2006
Secretariat: SFF Committee
Abstract: This document defines a Serial GPIO bus to be used in conjunction with Serial Attached SCSI (SAS)
or Serial ATA (SATA).
This specification provides a common definition for systems manufacturers, system integrators, and suppliers.
This is an internal working specification of the SFF Committee, an industry ad hoc group.
This specification 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.
Support: This document is supported by the identified member companies of the SFF Committee.
POINTS OF CONTACT:
Robert C Elliott
HP
MC 140801
PO Box 692000
Houston, TX 77269-2000
Phone: 281-518-5037
elliott@hp.com
I. Dal Allan
Chairman SFF Committee
14426 Black Walnut Court
Saratoga, CA 95070
Phone: 408-867-6630
endlcom@acm.org
SFF-8485 Revision 0.7 Published
2 Serial GPIO Bus
EXPRESSION OF SUPPORT BY MANUFACTURERS
The following member companies of the SFF Committee voted in favor of this industry specification:
Adaptec
Broadcom
Comax
EMC
ENDL
FCI
Foxconn
Fujitsu CPA
Hewlett Packard
Hitachi GST
LSI Logic
Molex
Sun Microsystems
The following SFF member companies voted no on the technical content of this industry specification:
Dell
The following member companies of the SFF Committee voted to abstain on this industry specification:
Amphenol
Emulex
Infineon
Intel
Seagate
Toshiba America
Tyco AMP
Unisys
Vitesse Semiconductor
Published SFF-8485 Revision 0.7
Serial GPIO Bus 3
REVISION HISTORY
R.1 Revision 0.1 (25 September 2003)
Initial version released to a few companies.
R.2 Revision 0.2 (2 October 2003)
Major cleanup to electricals and timing. Maximum frequency is 100 kHz. All signals are open-drain. Still need
to decide where the interoperability point(s) is/are. The physical layer section is still very much subject to
change. First release through SFF.
R.3 Revision 0.3 (25 January 2004)
Added a large minimum hold time so very slow receivers have a long time to sample the data. New: min 4400,
max none, old: min 0, max 345.
Reduced the setup time from 250 ns to 200 ns.
Removed the minimum rise and fall times.
Reduced the minimum fall time from 300 ns to 20 ns. This is the actively driven edge. 20 ns should be plenty
of time even with a 100 pF load.
Changed high level from 4700 ns to 4400 ns; low from 4000 ns to 4700 ns. The low period should be longer to
allow more after the falling edge where a receiver can sample data.
Removed separate transmit and receive versions of the high and low levels. Assume everything is slow
enough that the interconnect need not be treated as a transmission line.
Corrected text on active bit polarity. 1 = LED on, 0 = LED off. Whether 1 means active or inactive is not
mandated (though the SAS READY LED convention is recommended).
Removed maximum hysteresis.
Removed “constant frequency” requirement.
Added advice about HBAs with more than 4 ports. Added brief discussion of backplane usage (where the bit
stream from an expander is longer than 4).
Added notes about expected change to the port multiplier bit stream.
R.4 Revision 0.4 (25 May 2004)
Made SDataIn optional per request from John Lee at Intel (john.p.lee@intel.com).
Made the minimum bit stream length be four full drives, rather than 2 1/3 drives (the first bit position of the
third drive). The target must still be prepared for a new SLoad at any time (the initiator might have been reset)
but the usual dword stream should be a decent size.
Added advice to stop SClock low if the SGPIO initiator is still present, so targets can tell if the initiator is still
present.
Reordered the chapters: 6) Physical, 7) Protocol, 8) Programming interface.
Added a SMP function programming interface. This could stand as its own SFF document; for now, it is
proposed here.
R.5 Revision 0.5 (3 February 2005)
In the passive interconnect characteristics table, removed “Impedance R
B
” with a range of 45 ohm to 55 ohm.
In the transmitter and receiver electrical characteristics table, changed “source impedance while driving low
level R
S
” with a range of 45 ohm to 55 ohm into “Output current while driving low level I
OL
” with a range of 3
mA to 20 mA.
SFF-8485 Revision 0.7 Published
4 Serial GPIO Bus
Reduced reset timeout for target detecting SClock, SLoad, and SDataOut set to 1 to 64 ms from 2 s.
Removed SDataIn from the list (it only cares about signals from the SGPIO initiator when timing out the
initiator).
Added a maximum period (minimum frequency) for SClock of 31.25 ms (32 Hz).
Changed recommended default for
FORCE ACTIVITY OFF from 1/2 sec to 1/8 sec.
Changed recommended default for
MAXIMUM ACTIVITY ON from 2 sec to 1/2 sec.
Changed recommended default for
STRETCH ON to 1/64th.
Added more description of how
MAXIMUM ACTIVITY ON, FORCE ACTIVITY OFF, and STRETCH OFF interact.
Added warning note about toggling LEDs in unison.
Corrected
COUNT description in the GPIO_TX_GP_CFG register.
Added that during normal mode (in the register descriptions), the SLoad pattern is 0000b.
Updated PCI-E SIOM pin names and signal assignments to match those chosen SIOM revision 0.7 and 0.9.
Added “Suggested SGPIO usage model” chapter showing how the vendor-specific fields may be used.
Added these rules previously describing SClock to also describe SLoad: “When not using the SGPIO bus
(e.g., during a reset), the initiator shall set SLoad to 1 (i.e., tristate it). When using the SGPIO bus but
purposely not exchanging a bit stream, the initiator should set SLoad to 0. This lets the target know that the
initiator is still present and has not been removed.”
Added this rule previously describing SClock to also describe SDataOut: “When not using the SGPIO bus
(e.g., during a reset), the initiator shall set SDataOut to 1 (i.e., tristate it). support the corresponding drive
number.”
R.6 Revision 0.6 (10 October 2005)
Made wording more consistent for the terms: “LED” vs. “indicator”, “assert” vs. “turn on” vs. “enable”.
Renamed
STRETCH OFF field to STRETCH ACTIVITY OFF and STRETCH ON field to STRETCH ACTIVITY ON.
Based on Dell comment, deleted “(informative)” from chapter 9. The pin assignments for SGPIO on the
various interfaces are normative. Added “(informative)” to chapter 10 to emphasize that the suggested SPIO
usage is optional.
Changed SATA CABCON references to SATA 2.5 and updated the web site link to http://www.sata-io.org.
Changed PCI Express Server IO Module references to PCI Express ExpressModule (the final name chosen).
R.7 Revision 0.7 (1 February 2006)
Updated to reflect Published status.
Published SFF-8485 Revision 0.7
Serial GPIO Bus 5
FOREWORD
The development work on this specification was done by the SFF Committee, an industry group. The
membership of the committee since its formation in August 1990 has included a mix of companies which are
leaders across the industry.
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 and system
integrators worked individually with vendors to develop the packaging. The result was wide diversity, and
incompatibility.
The problems faced by integrators, device suppliers, and component suppliers led to the formation of the SFF
Committee as an industry ad hoc group to address the marketing and engineering considerations of the
emerging new technology.
During the development of the form factor definitions, other activities were suggested because participants in
the SFF Committee faced more problems than the physical form factors of disk drives. In November 1992, the
charter was expanded 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.
Those companies which have agreed to support a 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.
SFF Committee meetings are held during T10 weeks (see http://www.t10.org), and Specific Subject Working
Groups are held at the convenience of the participants. Material presented at SFF Committee meetings
becomes public domain, and there are no restrictions on the open mailing of material presented at committee
meetings.
Most of the specifications developed by the SFF Committee have either been incorporated into standards or
adopted as standards by EIA (Electronic Industries Association), ANSI (American National Standards
Institute) and IEC (International Electrotechnical Commission).
If you are interested in participating or wish to follow the activities of the SFF Committee, the signup for
membership and/or documentation can be found at:
http://www.sffcommittee.com/ie/join.html
The complete list of SFF Specifications which have been completed or are currently being worked on by the
SFF Committee can be found at:
ftp://ftp.seagate.com/sff/SFF-8000.TXT
If you wish to know more about the SFF Committee, the principles which guide the activities can be found at:
ftp://ftp.seagate.com/sff/SFF-8032.TXT
Suggestions for improvement of this specification will be welcome. They should be sent to the SFF
Committee, 14426 Black Walnut Ct, Saratoga, CA 95070.
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