diff options
Diffstat (limited to 'host/docs/usrp_e1xx.rst')
| -rw-r--r-- | host/docs/usrp_e1xx.rst | 49 |
1 files changed, 24 insertions, 25 deletions
diff --git a/host/docs/usrp_e1xx.rst b/host/docs/usrp_e1xx.rst index ef1e22b3a..31a47347f 100644 --- a/host/docs/usrp_e1xx.rst +++ b/host/docs/usrp_e1xx.rst @@ -5,11 +5,11 @@ UHD - USRP-E1XX Series Application Notes .. contents:: Table of Contents ------------------------------------------------------------------------ -Specify a non-standard image +Specify a Non-standard Image ------------------------------------------------------------------------ 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. +**--fpga=** device address parameter. Example device address string representations to specify non-standard FPGA image: @@ -19,15 +19,15 @@ image: fpga=usrp_e100_custom.bin ------------------------------------------------------------------------ -Changing the master clock rate +Changing the Master Clock Rate ------------------------------------------------------------------------ The master clock rate of the USRP-Embedded feeds both the FPGA DSP and the codec chip. 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 +* **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 @@ -35,23 +35,22 @@ Set 61.44MHz - uses external VCXO To use the 61.44MHz clock rate with the USRP-Embedded, two jumpers must be moved on the device. -* 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) +* **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). -**Note:** See instructions below to communicate the desired clock rate into the -UHD. +**Note:** See instructions below to communicate the desired clock rate UHD. ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ 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) +* **J16** is a two pin header; move the jumper to (pin1, pin2). +* **J15** is a three pin header; move the jumper to (pin2, pin3). -To communicate the desired clock rate into the UHD, +To communicate the desired clock rate into UHD, specify the a special device address argument, -where the key is "master_clock_rate" and the value is a rate in Hz. +where the key is **master_clock_rate** and the value is a rate in Hz. Example: :: @@ -66,15 +65,15 @@ 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. +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 +* 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**. ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ @@ -83,13 +82,13 @@ 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 +* 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) +* **<args** are device address arguments (optional if only one USRP is on your machine). :: @@ -106,7 +105,7 @@ UHD will always try to detect an installed GPSDO at runtime. There is not a special EEPROM value to burn for GPSDO detection. ------------------------------------------------------------------------ -Hardware setup notes +Hardware Setup Notes ------------------------------------------------------------------------ ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ @@ -132,5 +131,5 @@ Available Sensors The following sensors are available; they can be queried through the API. -* ref_locked - clock reference locked (internal/external) +* **ref_locked:** clock reference locked (internal/external) * other sensors are added when the GPSDO is enabled |