usrp-e100: added app notes for fpga loading and reclocking

3 files changed, 55 insertions, 1 deletions

diff --git a/host/docs/CMakeLists.txt b/host/docs/CMakeLists.txt
index 0c2cadfc2..c04262b63 100644
--- a/host/docs/CMakeLists.txt
+++ b/host/docs/CMakeLists.txt
@@ -29,6 +29,7 @@ SET(manual_sources
     transport.rst
     usrp1.rst
     usrp2.rst
+    usrp_e1xx.rst
 )
 
 ########################################################################
diff --git a/host/docs/index.rst b/host/docs/index.rst
index 6dac2680c..734300164 100644
--- a/host/docs/index.rst
+++ b/host/docs/index.rst
@@ -24,7 +24,9 @@ Application Notes
 * `Device Identification Notes <./identification.html>`_
 * `Firmware and FPGA Image Notes <./images.html>`_
 * `USRP1 Application Notes <./usrp1.html>`_
-* `USRP2 and N Series Application Notes <./usrp2.html>`_
+* `USRP2 Application Notes <./usrp2.html>`_
+* `USRP-N2XX Series Application Notes <./usrp2.html>`_
+* `USRP-E1XX Series Application Notes <./usrp_e1xx.html>`_
 * `Daughterboard Application Notes <./dboards.html>`_
 * `Transport Application Notes <./transport.html>`_
 
diff --git a/host/docs/usrp_e1xx.rst b/host/docs/usrp_e1xx.rst
new file mode 100644
index 000000000..e23295154
--- /dev/null
+++ b/host/docs/usrp_e1xx.rst
@@ -0,0 +1,51 @@
+========================================================================
+UHD - USRP-E1XX Series Application Notes
+========================================================================
+
+.. contents:: Table of Contents
+
+------------------------------------------------------------------------
+Specify a non-standard image
+------------------------------------------------------------------------
+The 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.
+UHD can dynamically reconfigure the clock rate though the set_master_clock_rate() API call.
+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, the USRP embedded will require two jumpers to be moved.
+
+* 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)
+
+For the correct clock settings, call usrp->set_master_clock_rate(61.44e6)
+before any other parameters are set in your application.
+
+^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+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)
+
+For the correct clock settings, call usrp->set_master_clock_rate(rate)
+before any other parameters are set in your application.