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<h1 id="firstHeading" class="firstHeading">M1 PCB errata and changes</h1>
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<div id="jump-to-nav">Jump to: <a href="index.php%3Ftitle=M1_PCB_errata_and_changes.html#column-one">navigation</a>, <a href="index.php%3Ftitle=M1_PCB_errata_and_changes.html#searchInput">search</a></div> <!-- start content -->
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<table id="toc" class="toc" summary="Contents"><tr><td><div id="toctitle"><h2>Contents</h2></div>
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<li class="toclevel-1"><a href="index.php%3Ftitle=M1_PCB_errata_and_changes.html#RC1_errata_and_areas_of_improvements"><span class="tocnumber">1</span> <span class="toctext">RC1 errata and areas of improvements</span></a>
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<ul>
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<li class="toclevel-2"><a href="index.php%3Ftitle=M1_PCB_errata_and_changes.html#Major_errors"><span class="tocnumber">1.1</span> <span class="toctext">Major errors</span></a></li>
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<li class="toclevel-2"><a href="index.php%3Ftitle=M1_PCB_errata_and_changes.html#Manufacturing_issues"><span class="tocnumber">1.2</span> <span class="toctext">Manufacturing issues</span></a></li>
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<li class="toclevel-2"><a href="index.php%3Ftitle=M1_PCB_errata_and_changes.html#Minor_errors_and_improvements"><span class="tocnumber">1.3</span> <span class="toctext">Minor errors and improvements</span></a></li>
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</ul>
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</li>
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<li class="toclevel-1"><a href="index.php%3Ftitle=M1_PCB_errata_and_changes.html#RC2_errata_and_areas_of_improvements"><span class="tocnumber">2</span> <span class="toctext">RC2 errata and areas of improvements</span></a></li>
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</ul>
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<a name="RC1_errata_and_areas_of_improvements" id="RC1_errata_and_areas_of_improvements"></a><h1><span class="editsection">[<a href="http://milkymist.org/wiki/index.php?title=M1_PCB_errata_and_changes&action=edit&section=1" title="Edit section: RC1 errata and areas of improvements">edit</a>]</span> <span class="mw-headline"> RC1 errata and areas of improvements </span></h1>
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<a name="Major_errors" id="Major_errors"></a><h2><span class="editsection">[<a href="http://milkymist.org/wiki/index.php?title=M1_PCB_errata_and_changes&action=edit&section=2" title="Edit section: Major errors">edit</a>]</span> <span class="mw-headline"> Major errors </span></h2>
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<p>These errors prevent parts of the unmodified board from working.
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</p>
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<ul><li> Connect P[15:8] instead of P[7:0] on the video decoder chip U21
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</li><li> The MIDI optoisolator is not suitable. Replace it with a 6N138S/6N138_X007 and lower R54 to 120 ohms. Connect pin 8 to 3.3V and leave pin 7 unconnected.
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</li><li> For USB to work reliably, 15K pull down resistors <a href="http://www.beyondlogic.org/usbnutshell/usb2.htm" class="external text" title="http://www.beyondlogic.org/usbnutshell/usb2.htm" rel="nofollow">must be installed</a> on the D+ and D- lines of each USB port (<a href="http://www.intel.com/technology/usb/download/usb2dg_r1_0.pdf" class="external text" title="http://www.intel.com/technology/usb/download/usb2dg_r1_0.pdf" rel="nofollow">between the 24 ohm resistors and the ports</a>). Add the possibility to make them pull-up resistors to 3.3V (i.e. add placeholders for pull-ups) so the USB ports could work in device mode with a small PCB modification.
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</li></ul>
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<a name="Manufacturing_issues" id="Manufacturing_issues"></a><h2><span class="editsection">[<a href="http://milkymist.org/wiki/index.php?title=M1_PCB_errata_and_changes&action=edit&section=3" title="Edit section: Manufacturing issues">edit</a>]</span> <span class="mw-headline"> Manufacturing issues </span></h2>
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<ul><li> The installed IR detectors do not work.
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</li><li> R39 and R30 are swapped (no symptom).
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</li><li> R147, R148 and R150 are missing (unreliable DDC).
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</li></ul>
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<a name="Minor_errors_and_improvements" id="Minor_errors_and_improvements"></a><h2><span class="editsection">[<a href="http://milkymist.org/wiki/index.php?title=M1_PCB_errata_and_changes&action=edit&section=4" title="Edit section: Minor errors and improvements">edit</a>]</span> <span class="mw-headline"> Minor errors and improvements </span></h2>
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<p>These errors do not alter the functionality of the board.
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</p>
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<ul><li> Add 1K pull-down resistor on ETH_RESET_N (specification says reset should be low during power-up)
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</li><li> Add 1K pull-down resistor on VIDEOIN_RESET_N (the application schematics includes external POR circuitry)
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</li><li> Add notch to mark pin 1 of J3 on silkscreen
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</li><li> Use red, green and blue connectors for J18
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</li><li> We might want a larger soldered area under the pads of U10
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</li><li> Indicate "+/- 5%" and pinout (positive in the middle) near J11 on silkscreen
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</li><li> Add a 5V supply pin on the GPIO expansion header
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</li><li> Add a test point at the output of the MIDI optoisolator
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</li><li> Add test points on the USB signals (3.3V FPGA side: VP, VM, RCV, OE)
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</li><li> To reduce audio output noise, power the LM4550 analog supply through an additional TPS76301 set to 4.3V.
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</li><li> In order to be able to detect board revisions, route 4 FPGA I/O pins to placeholders for 0402 pull-up resistors. The combination of placed and non-placed resistors encodes the board revision. The RC2 board should be encoded as 0001 (ie place only 1 resistor) to distinguish it from RC1 which does not have any resistor. Use 1K resistors for pull-ups.
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</li><li> <a href="http://www.milkymist.org/wiki/index.php?title=RC1_signal_integrity_measurements" class="external text" title="http://www.milkymist.org/wiki/index.php?title=RC1_signal_integrity_measurements" rel="nofollow">Improve power supply immunity</a>:
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<ul><li> Use at least one via for each power or ground pin of the FPGA (i.e. no via sharing)
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</li><li> Add more and bigger decoupling capacitors and more power vias around the SDRAM
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</li><li> Use several vias to connect decoupling capacitors whenever possible, especially the big ones (>= 10uF)
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</li></ul>
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</li><li> Add a 0402 capacitor placeholder between PROGRAM_B and ground to be able to delay FPGA configuration if needed
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</li><li> Indicate "Not 5V tolerant" near J21 (GPIO expansion header)
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</li></ul>
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<a name="RC2_errata_and_areas_of_improvements" id="RC2_errata_and_areas_of_improvements"></a><h1><span class="editsection">[<a href="http://milkymist.org/wiki/index.php?title=M1_PCB_errata_and_changes&action=edit&section=5" title="Edit section: RC2 errata and areas of improvements">edit</a>]</span> <span class="mw-headline"> RC2 errata and areas of improvements </span></h1>
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<ul><li> Power supply overvoltage and reversed polarity protection
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</li><li> Video input overvoltage protection
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</li><li> Reduce video input antialias filter capacitors to 120pF
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</li><li> Switch to WM9707 codec for improved audio quality
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</li><li> Fix intermittent "no FPGA configuration at power-up" problem
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</li><li> Use SMD crystal for video input
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</li><li> Bigger Milkymist logo
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</li></ul>
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