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| author | Ashish Chaudhari <ashish@ettus.com> | 2015-01-22 14:15:34 -0800 |
|---|---|---|
| committer | Ashish Chaudhari <ashish@ettus.com> | 2015-01-22 14:15:34 -0800 |
| commit | 1f44f06abad589d2244eecfcbca1618b4fcb3ffd (patch) | |
| tree | ace8223ec045ab7d53a383d5e4805aa5deb00a80 /host/docs/usrp_e3x0.dox | |
| parent | 9c3cdb6ee831f164e5a8734a71ad3cd5543719ac (diff) | |
| download | uhd-1f44f06abad589d2244eecfcbca1618b4fcb3ffd.tar.gz uhd-1f44f06abad589d2244eecfcbca1618b4fcb3ffd.tar.bz2 uhd-1f44f06abad589d2244eecfcbca1618b4fcb3ffd.zip | |
e300: UHD support for refclk disciplining using PPS.
- Only supported value for clk_source is internal
- time_source automatically changes the disciplining pulse source
- Added ref_locked sensor
Diffstat (limited to 'host/docs/usrp_e3x0.dox')
| -rw-r--r-- | host/docs/usrp_e3x0.dox | 7 |
1 files changed, 5 insertions, 2 deletions
diff --git a/host/docs/usrp_e3x0.dox b/host/docs/usrp_e3x0.dox index 7fab73f20..8f94ea64d 100644 --- a/host/docs/usrp_e3x0.dox +++ b/host/docs/usrp_e3x0.dox @@ -7,7 +7,6 @@ - Hardware Capabilities: Integrated RF frontend (70 MHz - 6 GHz) - External PPS reference input - - External 10 MHz reference input - Configurable clock rate - Internal GPIO connector with UHD API control - 2 USB 2.0 Host ports @@ -132,7 +131,7 @@ which should return 'arm-oe-linux-gnueabi'. -# Setup your environment as described in \ref e3x0_sdk_usage -# Type the following in the build directory (assuming a build in host/build): - $ cmake -DCMAKE_TOOLCHAIN_FILE=<youruhdsrc>/host/cmake/Toolchains/oe-sdk_cross.cmake -DENABLE_E300 .. + $ cmake -DCMAKE_TOOLCHAIN_FILE=<youruhdsrc>/host/cmake/Toolchains/oe-sdk_cross.cmake -DENABLE_E300=ON .. $ make \subsubsection e3x0_sdk_usage_gnuradio Building GNU Radio @@ -276,6 +275,8 @@ You may need to change the USRP's IP address for several reasons: \subsection e3x0_hw_pps PPS - Pulse Per Second Using a PPS signal for timestamp synchronization requires a square wave signal with the following a 5Vpp amplitude. +An external PPS can be used to discipline the internal reference clock. This feature is automatically +enabled with the time source is set to "external". To test the PPS input, you can use the following tool from the UHD examples: @@ -288,6 +289,8 @@ To test the PPS input, you can use the following tool from the UHD examples: Your USRP-E Series device comes with an internal GPS. In order to get a lock on a satellite an external GPS antenna is required. +The PPS from the internal GPS can be used to discipline the internal reference clock. This feature is automatically +enabled with the time source is set to "gpsdo". The device provides a 3.3V supply voltage to an external antenna connected to the *GPS* port of your device. Note that this supply voltage is turned off in order to safe power upon destruction of the software object. |