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UPAMD, The progress of the draft for UPAMD/P1823 has been slowed as communication issues within the system have been worked on. As the working subcommittees have been attended by fewer people, I would like to bring this forward to the whole group for discussion of direction and getting the sense of the working group in moving forward. The only power debate issue that needs to be decided is what to do if the communication fails between the source and the sink. There have been two proposals forwarded and we need to decide on one. NOTE: If the communications signals are separated, no sink termination seen, the power will be immediately terminated. Loss of communications indicate that one of the communicating elements has ceased to operate properly. 1. First proposal on loss of communications with the sink was to revert to deliver the 21V @ 1A uncommunicative sink power level. This was also called the fall back/limp along power level. It was felt that most devices could lower their power to this level and limp along until the communication was restored or the system restarted. 2. The second proposal discussed was that if communications was lost, but connectivity of the communication wires retained, the power should stay at the last agreed upon setting. Deciding this issue will allow the state diagrams to be cleaned up. The communications level issue has consumed far more time and effort. Three levels of communications have been discussed, these include: 1. Basic power level setting directly between source and sink. This would also include the product identification registers. This capability has been in the draft for many months and reviewed several times. 2. General communication between multiple members of a UPAMD power system. This includes the ability to send messages which would allow for data transfer among directly and indirectly attached devices. Discovery is possible with this capability. General system monitoring would use this capability. 3. Extended command and control of the system by an active system monitor. Extended capability for command of the elements of the system require authentication and trust systems beyond what can be done in the first UPAMD standard. This may be appropriate for an P1823.1 standard or a revision of the base P1823/UPAMD standard in the future. Opinion are solicited on the need for this capability in the first standard. Basic signaling between the source and sink for power control and identification have been in the draft for some time and have been repeatedly visited to assure information exchange and smart local power control. This should work as designed, subject to significant review of the working group. The proposed inclusion of a general communications scheme has been worked on for the last several months and appears to be very close to complete, probably in the next two weeks or so. This capability supports: 1. Ability to deliver long, multiple 8 byte, messages from one element of the system to another. 2. Discovery of devices in the system. 3. Determination of overall system state. 4. This system capability would need to be in place for future versions of the UPAMD system to add features. 5. This requires no additional hardware costs. Please comment to the group on the desire for this capability. The agenda for tomorrow’s meeting follows: Respectfully; Bob Davis Chair UPAMD/P1823 bobd@xxxxxxxx 408.353.5990 desk 408.857.1273 cell bob.davis.scsi.com Skype Universal Power Adapter for Mobile Devices (UPAMD) Working Group Start Time: 22 November 2011 5:00 P.M. PST UTC-7 (0100GMT/Zulu 23 November 2011) World Wide Local Dial in telephone numbers see Intercall’s list This will be a WebEx meeting Webex Meeting Number: 592 864 169, Go tohttps://intercall.webex.com/intercall/j.php?J=592864169 Call-in toll-free number: 1-866-349-5441 (US/Canada) Conference Code: 408 857 1273 Preliminary Agenda Call to Order UPAMD Working Group meeting - Bob Davis 0100Z 23 November 2011
V. UPAMD Goal Focus a. Results of Loss of Communications during power delivery i. Revert to 21V@1A = non-communicative power level? ii. Continue power level being used prior to loss of communications? b. Communications capabilities i. Should UPAMD be restricted to simple register communications as in power request and power available and simple direct attached register reads? ii. Should UPAMD implement basic message communications? 1. Allow messages to propagate in system 2. Allow discovery of connected elements 3. About 2 weeks of work needed 4. No cost implications to products VI. Communications Goals – Edgar Brown a. Review Subcommittee Chair presentation and subcommittee progress. b. Discovery of devices attached - addressing c. Data transfer protocols VII. Power Goals – Paul Panepinto a. Review Subcommittee Chair presentation and subcommittee progress. b. Adapter/Source power priority strategy c. Revised power charts VIII. Connector Goals – Mark Anderson a. Review Subcommittee Chair presentation and subcommittee progress. b. Target definition and target pin surface shape, single com pin Target c. Reworked connector and cable section IX. Conformity/Certification Goals – Bob Noseworthy a. Objectives b. Planned meeting schedule week following this meeting on Wednesday. X. New Business a. Plans for a 1.5 or 2.5 day Face-to-Face Meeting in February in Bay Area to finalize draft. XI. UPAMD Working Group Meeting Schedule: a. 06 December 2011 at the 7AM Pacific time slot b. 20 December 2011 at the 5PM Pacific time slot c. 03 January 2012 at the 7AM Pacific time slot d. 17 January 2012 at the 5PM Pacific time slot e. 31 January 2012 at the 7AM Pacific time slot – possible face to face f. 14 February 2012 at the 5PM Pacific time slot – possible face to face g. 28 February 2012 at the 7AM Pacific time slot XII. Other concerns of the group a. Subcommittee meetings are scheduled in same time slot as Working Group meeting. i. Connector Committee – same week on Thursday. ii. Communication Committee meets following week on Tuesday iii. Conformity Committee – meets following week on Wednesday iv. Power Committee - meets following week, on Thursday XIII. Adjournment. Please send any changes or additions to Bob Davis bobd@xxxxxxxx. |