DOM MB Rev 4.2 to Rev 5.0 Changes April 26, 2004 Gerald Przybylski Lawerence Berkeley National Laboratory

Review, May 5, 2004Lawerence Berkeley National Laboratory 2 History Rev 1, January 3, 2003, Translation from OrCAD Rev 2, April 9, 2003, Booting & Memory troubles Rev 3, September 2, 2003, Clamping troubles Rev 4.1, February 3, 2004, ~ 110 changes incorporated Rev 4.2, March 15, 2004, ~ 12 more changes

Review, May 5, 2004Lawerence Berkeley National Laboratory 3 Status & Requirements Rev 4.2 Meets Performance Requirements BOM Mature, Minimized, Qualified Last batch: 20 cards; not loading errors, 1 solder bridge, 1 cold solder, 1 tombstone. Mechanical Tweaks Little Time Left for Improvements Changes Carry Risk

Review, May 5, 2004Lawerence Berkeley National Laboratory 4 Circuitry  Shield between DOMMB and delay for PS noise - Reduce EMI pick-up  Shield over 7W DC-DC converter - Reduce EMI pick-up  Add Bypass capacitors at ATWD for PS noise - Filter noise +Add 1.8V SDRAM Memory Power Option - One 0603 Jumper Footprint +Add enhancement for LC Tx Idle Restoration - Two 0603 Resistor Footprints & Traces

Review, May 5, 2004Lawerence Berkeley National Laboratory 5 Design for Manufacturability & for Integration Move/Modify Signal Connections - Twisted Pair Attachments Become Posts - Relocate RA SMB PMT Signal Connector DNL (do not load) TP25 - Resolve Interference with RA SMB 0.005” trace/space feasibility - Toward Full IPC 6012 Class 3 Compliance Serial number relocation - Enable inspection for sealed DOM

Review, May 5, 2004Lawerence Berkeley National Laboratory 6 Reliability Related Delete (?) Panasonic CM Inductor →Eliminate Capacitors with Pure Tin Leads - by Footprint Changes, 0603 → 0805 Miscellaneous No-Load hard and soft reboot push buttons Various loading clarifications in schematic

Review, May 5, 2004Lawerence Berkeley National Laboratory 7 Remaining Issues Communications Balun(s) Shielding/Moving DC-DC Converter to Suppress EMI consistently below ¼ SPE Timely Delivery of Corning Oscillators Tin on Corning Oscillator Components Undiscovered Integration Issues

Review, May 5, 2004Lawerence Berkeley National Laboratory 8 Conclusion Significant progress in the last year. Converging (or converged?) The performance is there. Small worries remain