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authorJosh Blum <josh@joshknows.com>2012-07-17 16:32:59 -0700
committerJosh Blum <josh@joshknows.com>2012-07-17 16:32:59 -0700
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-========================================================================
-UHD - USRP-E1XX Series Application Notes
-========================================================================
-
-.. contents:: Table of Contents
-
-------------------------------------------------------------------------
-Specify a Non-standard Image
-------------------------------------------------------------------------
-UHD will automatically select the USRP-Embedded FPGA image from the
-installed images package. The FPGA image selection can be overridden with the
-**--fpga=** device address parameter.
-
-Example device address string representations to specify non-standard FPGA
-image:
-
-::
-
- fpga=usrp_e100_custom.bin
-
-------------------------------------------------------------------------
-Changing the Master Clock Rate
-------------------------------------------------------------------------
-The master clock rate of the USRP-Embedded feeds both the FPGA DSP and the codec
-chip. Hundreds of rates between 32MHz and 64MHz are available. A few notable
-rates are:
-
-* **64MHz:** maximum rate of the codec chip
-* **61.44MHz:** good for UMTS/WCDMA applications
-* **52Mhz:** good for GSM applications
-
-^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
-Set 61.44MHz - uses external VCXO
-^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
-To use the 61.44MHz clock rate with the USRP-Embedded, two jumpers must be moved
-on the device.
-
-* **J16** is a two pin header; remove the jumper (or leave it on pin1 only).
-* **J15** is a three pin header; move the jumper to (pin1, pin2).
-
-**Note:** See instructions below to communicate the desired clock rate UHD.
-
-^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
-Set other rates - uses internal VCO
-^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
-To use other clock rates, the jumpers will need to be in the default position.
-
-* **J16** is a two pin header; move the jumper to (pin1, pin2).
-* **J15** is a three pin header; move the jumper to (pin2, pin3).
-
-To communicate the desired clock rate into UHD,
-specify the a special device address argument,
-where the key is **master_clock_rate** and the value is a rate in Hz.
-Example:
-::
-
- uhd_usrp_probe --args="master_clock_rate=52e6"
-
-------------------------------------------------------------------------
-Clock Synchronization
-------------------------------------------------------------------------
-
-
-^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
-Ref Clock - 10MHz
-^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
-The E1xx has a 10MHz TCXO which can be used to discipline the flexible clocking
-by selecting **REF_INT** for the **clock_config_t**.
-
-Alternately, an external 10MHz reference clock can be supplied by soldering
-a connector.
-
-* Connector **J10** (REF_IN) needs MCX connector **WM5541-ND** or similar.
-* Square wave will offer the best phase noise performance, but sinusoid is acceptable.
-* **Power level:** 0 to 15dBm
-* Select **REF_SMA** in **clock_config_t**.
-
-
-^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
-PPS - Pulse Per Second
-^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
-An exteral PPS signal for timestamp synchronization can be supplied by soldering
-a connector.
-
-* Connector **J13** (PPS) needs MCX connector **WM5541-ND** or similar.
-* Requires a square wave signal.
-* **Amplitude:** 3.3 to 5Vpp
-
-Test the PPS input with the following app:
-
-* **<args** are device address arguments (optional if only one USRP is on your machine).
-
-::
-
- cd <install-path>/share/uhd/examples
- ./test_pps_input --args=<args>
-
-^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
-Internal GPSDO
-^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
-Please see the `Internal GPSDO Application Notes <./gpsdo.html>`_
-for information on configuring and using the internal GPSDO.
-
-UHD will always try to detect an installed GPSDO at runtime.
-There is not a special EEPROM value to burn for GPSDO detection.
-
-------------------------------------------------------------------------
-Hardware Setup Notes
-------------------------------------------------------------------------
-
-^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
-Front panel LEDs
-^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
-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:
-
-* **LED A:** transmitting
-* **LED B:** fpga loaded
-* **LED C:** receiving
-* **LED D:** fpga loaded
-* **LED E:** reference lock
-* **LED F:** board power
-
-------------------------------------------------------------------------
-Miscellaneous
-------------------------------------------------------------------------
-
-^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
-Available Sensors
-^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
-The following sensors are available;
-they can be queried through the API.
-
-* **ref_locked:** clock reference locked (internal/external)
-* other sensors are added when the GPSDO is enabled