diff options
Diffstat (limited to 'host/docs')
| -rw-r--r-- | host/docs/usrp1.rst | 9 | ||||
| -rw-r--r-- | host/docs/usrp_e1xx.rst | 8 |
2 files changed, 11 insertions, 6 deletions
diff --git a/host/docs/usrp1.rst b/host/docs/usrp1.rst index f77a26e0a..97a8c3bb5 100644 --- a/host/docs/usrp1.rst +++ b/host/docs/usrp1.rst @@ -136,6 +136,11 @@ The USRP can be modified to accept an external clock reference instead of the 64 The new external clock needs to be a square wave between +7dBm and +15dBm -For the correct clock settings, call usrp->set_master_clock_rate(EXT_CLOCK_FREQUENCY) -before any other parameters are set in your application. +After the hardware modification, +the user should burn the setting into the EEPROM, +so UHD can initialize with the correct clock rate. +Run the following commands to record the setting into the EEPROM: +:: + cd <install-path>/share/uhd/utils + ./usrp_burn_mb_eeprom --args=<optional device args> --key=mcr --val=<rate> diff --git a/host/docs/usrp_e1xx.rst b/host/docs/usrp_e1xx.rst index b2a6ff08c..036d2c02c 100644 --- a/host/docs/usrp_e1xx.rst +++ b/host/docs/usrp_e1xx.rst @@ -35,11 +35,11 @@ To use the 61.44MHz clock rate, the USRP embedded will require two jumpers to be * 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) -Then run the following commands to record the setting in the EEPROM: +Then run the following commands to record the setting into the EEPROM: :: cd <install-path>/share/uhd/utils - ./usrp_burn_mb_eeprom --key=master_clock_rate --val=61.44e6 + ./usrp_burn_mb_eeprom --key=mcr --val=61.44e6 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ @@ -50,11 +50,11 @@ 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) -Then run the following commands to record the setting in the EEPROM: +Then run the following commands to record the setting into the EEPROM: :: cd <install-path>/share/uhd/utils - ./usrp_burn_mb_eeprom --key=master_clock_rate --val=<rate> + ./usrp_burn_mb_eeprom --key=mcr --val=<rate> ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ Clock rate recovery - unbricking |