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<div class="document" id="uhd-usrp-e1x0-series-device-manual">
<h1 class="title">UHD - USRP-E1x0 Series Device Manual</h1>
<div class="contents topic" id="table-of-contents">
<p class="topic-title first">Table of Contents</p>
<ul class="simple">
<li><a class="reference internal" href="#comparative-features-list" id="id1">Comparative features list</a></li>
<li><a class="reference internal" href="#specify-a-non-standard-image" id="id2">Specify a Non-standard Image</a></li>
<li><a class="reference internal" href="#changing-the-master-clock-rate" id="id3">Changing the Master Clock Rate</a><ul>
<li><a class="reference internal" href="#set-61-44mhz-uses-external-vcxo" id="id4">Set 61.44MHz - uses external VCXO</a></li>
<li><a class="reference internal" href="#set-other-rates-uses-internal-vco" id="id5">Set other rates - uses internal VCO</a></li>
</ul>
</li>
<li><a class="reference internal" href="#clock-synchronization" id="id6">Clock Synchronization</a><ul>
<li><a class="reference internal" href="#ref-clock-10mhz" id="id7">Ref Clock - 10MHz</a></li>
<li><a class="reference internal" href="#pps-pulse-per-second" id="id8">PPS - Pulse Per Second</a></li>
<li><a class="reference internal" href="#internal-gpsdo" id="id9">Internal GPSDO</a></li>
</ul>
</li>
<li><a class="reference internal" href="#hardware-setup-notes" id="id10">Hardware Setup Notes</a><ul>
<li><a class="reference internal" href="#front-panel-leds" id="id11">Front panel LEDs</a></li>
</ul>
</li>
<li><a class="reference internal" href="#miscellaneous" id="id12">Miscellaneous</a><ul>
<li><a class="reference internal" href="#available-sensors" id="id13">Available Sensors</a></li>
</ul>
</li>
</ul>
</div>
<div class="section" id="comparative-features-list">
<h1>Comparative features list</h1>
<dl class="docutils">
<dt><strong>Hardware Capabilities:</strong></dt>
<dd><ul class="first last simple">
<li>1 transceiver card slot</li>
<li>Internal PPS reference input</li>
<li>Internal 10 MHz reference input</li>
<li>Configurable clock rate (defaults to 64 MHz)</li>
<li>Internal GPSDO option</li>
</ul>
</dd>
<dt><strong>FPGA Capabilities:</strong></dt>
<dd><ul class="first last simple">
<li>2 RX DDC chains in FPGA</li>
<li>1 TX DUC chain in FPGA</li>
<li>Timed commands in FPGA</li>
<li>Timed sampling in FPGA</li>
<li>sc8 and sc16 sample modes<ul>
<li>Up to 8 MHz of RF BW with 16-bit samples</li>
<li>Up to 16 MHz of RF BW with 8-bit samples</li>
</ul>
</li>
</ul>
</dd>
</dl>
</div>
<div class="section" id="specify-a-non-standard-image">
<h1>Specify a Non-standard Image</h1>
<p>UHD software will automatically select the USRP-Embedded FPGA image from the
installed images package. The FPGA image selection can be overridden with the
<strong>fpga</strong> device address parameter.</p>
<p>Example device address string representations to specify non-standard FPGA
image:</p>
<pre class="literal-block">
fpga=usrp_e100_custom.bin
</pre>
</div>
<div class="section" id="changing-the-master-clock-rate">
<h1>Changing the Master Clock Rate</h1>
<p>The master clock rate of the USRP-Embedded feeds both the FPGA DSP and the codec
chip. Hundreds of rates between 32 MHz and 64 MHz are available. A few notable
rates are:</p>
<ul class="simple">
<li><strong>64 MHz:</strong> maximum rate of the codec chip</li>
<li><strong>61.44 MHz:</strong> good for UMTS/WCDMA applications</li>
<li><strong>52 MHz:</strong> good for GSM applications</li>
</ul>
<div class="section" id="set-61-44mhz-uses-external-vcxo">
<h2>Set 61.44MHz - uses external VCXO</h2>
<p>To use the 61.44 MHz clock rate with the USRP-Embedded, two jumpers must be moved
on the device.</p>
<ul class="simple">
<li><strong>J16</strong> is a two pin header; remove the jumper (or leave it on pin1 only).</li>
<li><strong>J15</strong> is a three pin header; move the jumper to (pin1, pin2).</li>
</ul>
<p><strong>Note:</strong> See instructions below to communicate the desired clock rate to UHD software.</p>
</div>
<div class="section" id="set-other-rates-uses-internal-vco">
<h2>Set other rates - uses internal VCO</h2>
<p>To use other clock rates, the jumpers will need to be in the default position.</p>
<ul class="simple">
<li><strong>J16</strong> is a two pin header; move the jumper to (pin1, pin2).</li>
<li><strong>J15</strong> is a three pin header; move the jumper to (pin2, pin3).</li>
</ul>
<p>To communicate the desired clock rate into UHD software,
specify the a special device address argument,
where the key is <strong>master_clock_rate</strong> and the value is a rate in Hz.
Example:</p>
<pre class="literal-block">
uhd_usrp_probe --args="master_clock_rate=52e6"
</pre>
</div>
</div>
<div class="section" id="clock-synchronization">
<h1>Clock Synchronization</h1>
<div class="section" id="ref-clock-10mhz">
<h2>Ref Clock - 10MHz</h2>
<p>The E1xx has a 10MHz TCXO which can be used to discipline the flexible clocking
by selecting <strong>REF_INT</strong> for the <strong>clock_config_t</strong>.</p>
<p>Alternately, an external 10MHz reference clock can be supplied by soldering
a connector.</p>
<ul class="simple">
<li>Connector <strong>J10</strong> (REF_IN) needs MCX connector <strong>WM5541-ND</strong> or similar.</li>
<li>Square wave will offer the best phase noise performance, but sinusoid is acceptable.</li>
<li><strong>Power level:</strong> 0 to 15dBm</li>
<li>Select <strong>REF_SMA</strong> in <strong>clock_config_t</strong>.</li>
</ul>
</div>
<div class="section" id="pps-pulse-per-second">
<h2>PPS - Pulse Per Second</h2>
<p>An external PPS signal for timestamp synchronization can be supplied by soldering
a connector.</p>
<ul class="simple">
<li>Connector <strong>J13</strong> (PPS) needs MCX connector <strong>WM5541-ND</strong> or similar.</li>
<li>Requires a square wave signal.</li>
<li><strong>Amplitude:</strong> 3.3 to 5 Vpp</li>
</ul>
<p>Test the PPS input with the following app (<strong><args></strong> are device address
arguments, optional if only one USRP device is on your machine):</p>
<pre class="literal-block">
cd <install-path>/lib/uhd/examples
./test_pps_input --args=<args>
</pre>
</div>
<div class="section" id="internal-gpsdo">
<h2>Internal GPSDO</h2>
<p>Please see the <a class="reference external" href="./gpsdo.html">Internal GPSDO Application Notes</a>
for information on configuring and using the internal GPSDO.</p>
<p>UHD software will always try to detect an installed GPSDO at runtime.
It is not necessary to burn a special EEPROM value for GPSDO detection.</p>
</div>
</div>
<div class="section" id="hardware-setup-notes">
<h1>Hardware Setup Notes</h1>
<div class="section" id="front-panel-leds">
<h2>Front panel LEDs</h2>
<p>The LEDs on the front panel can be useful in debugging hardware and software
issues. The LEDs reveal the following about the state of the device:</p>
<ul class="simple">
<li><strong>LED A:</strong> transmitting</li>
<li><strong>LED B:</strong> PPS signal</li>
<li><strong>LED C:</strong> receiving</li>
<li><strong>LED D:</strong> FPGA loaded</li>
<li><strong>LED E:</strong> reference lock</li>
<li><strong>LED F:</strong> board power</li>
</ul>
</div>
</div>
<div class="section" id="miscellaneous">
<h1>Miscellaneous</h1>
<div class="section" id="available-sensors">
<h2>Available Sensors</h2>
<p>The following sensors are available;
they can be queried through the API.</p>
<ul class="simple">
<li><strong>ref_locked:</strong> clock reference locked (internal/external)</li>
<li>other sensors are added when the GPSDO is enabled</li>
</ul>
</div>
</div>
</div>
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Generated on: 2014-10-15 11:47 UTC.
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