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Diffstat (limited to 'host/docs/usrp_e1xx.rst')
| -rw-r--r-- | host/docs/usrp_e1xx.rst | 40 |
1 files changed, 39 insertions, 1 deletions
diff --git a/host/docs/usrp_e1xx.rst b/host/docs/usrp_e1xx.rst index ffcd370dd..2818a0a65 100644 --- a/host/docs/usrp_e1xx.rst +++ b/host/docs/usrp_e1xx.rst @@ -61,5 +61,43 @@ can talk directly to the clock generator over a SPI interface. Run the following commands to restore the clock generator to a usable state: :: - cd <prefix>/share/uhd/usrp_e_utilities + cd <install-path>/share/uhd/usrp_e_utilities ./usrp-e-utility --fpga=../images/usrp_e100_pt_fpga.bin --reclk + + +------------------------------------------------------------------------ +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> |