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-rw-r--r--host/docs/usrp_e3x0.dox5
1 files changed, 4 insertions, 1 deletions
diff --git a/host/docs/usrp_e3x0.dox b/host/docs/usrp_e3x0.dox
index c01a0b74f..b92d15363 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
@@ -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.