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100 lines
3.4 KiB
HTML
100 lines
3.4 KiB
HTML
<TITLE>Production and testing</TITLE>
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<BODY>
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<HTML>
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<H1>Production and testing</H1>
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This document gives a high-level description of the production test process
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for <B>atben</B> and <B>atusb</B> boards, plus - in the case of <B>atusb</B>
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the production steps required between the boards leaving the SMT line and the
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actual testing.
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<P>
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The testing serves two purposes:
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<OL>
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<LI>Ascertain the correctness of the preceding production steps, and
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<LI>identify suffering from random production flaws and either discard
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them or prepare them for repair.
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</OL>
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The results of testing and fault analysis also provide feedback for the
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SMT process and steps preceding it.
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<P>
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The following diagram illustrates the workflow:
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<P>
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<IMG src="flow.png">
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<P>
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Only <B>atusb</B> boards contain firmware and need flashing (which is
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a two-step process, see below). The functional tests and further fault
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analysis are largely the same for <B>atben</B> and <B>atusb</B>.
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<P>
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Devices accepted for further use can then be packaged for shipping.
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Defective devices can be discarded or retained for a deeper analysis.
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<!-- ====================================================================== -->
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<H2>Terminology</H2>
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<DL>
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<DT>Ben</DT>
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<DD>a device capable of hosting the <B>atben</B> and <B>atusb-pgm</B>
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boards. In the production process, a Ben can perform three different
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roles:
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<OL>
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<LI> Host an <B>atben</B> board acting as DUT
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<LI> Host an <B>atben</B> board acting as reference
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<LI> Host an <B>atusb-pgm</B> used for flashing the boot loader
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</OL>
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In this document, we assume that a single Ben is used in all
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three roles, with the board in its 8:10 card slot changed as
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the role requires.
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<DT>PC</DT>
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<DD>a device capable of connecting to a Ben via USB, and of hosting an
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<B>atusb</B> board. In the production process, a PC can perform three
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different roles:
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<OL>
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<LI> Host an <B>atusb</B> board acting as DUT
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<LI> Host an <B>atusb</B> board acting as reference
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<LI> Control a Ben via USB (for convenience)
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</OL>
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In this document, we assume that a single PC is used in all
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three roles, with one USB host port permanently connecting to the
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Ben, and a second USB host port populated with <B>atusb</B> boards
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as needed.
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<DT>DUT</DT>
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<DD>Device Under Test. An <B>atben</B> or <B>atusb</B> board that
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has left SMT, and is being prepared for testing or in the process
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of being tested.
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<DT>Reference device</DT>
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<DD>An <B>atben</B> or <B>atusb</B> device that is known to work and
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and that acts as a peer for RF communication with the DUT.
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<DT>SMT</DT>
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<DD>In this context, the actual process of soldering components to
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the unpopulated PCB, and all related tasks providing an input to
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this process. Such related tasks include the configuration of the
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SMT line, and testing and conditioning of the components prior to
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soldering.
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</DL>
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<!-- ====================================================================== -->
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<H2>Detailed description</H2>
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The following pages describe the preparation and the execution of the
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production and test process:
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<UL>
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<LI><A href="setup.html">Software setup</A>
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<LI><A href="flash.html">Flashing (<B>atusb</B> only)</A>
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<LI><A href="test.html">Functional test</A>
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<LI><A href="analysis.html">Fault analysis</A>
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</UL>
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<P>
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<HR>
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Last update: 2011-05-19 <I>Werner Almesberger</I>
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<HR>
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</BODY>
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</HTML>
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