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diff --git a/host/docs/usrp1.dox b/host/docs/usrp1.dox new file mode 100644 index 000000000..9dfdf02c5 --- /dev/null +++ b/host/docs/usrp1.dox @@ -0,0 +1,95 @@ +/*! \page page_usrp1 USRP1 Device Manual + +\tableofcontents + +\section usrp1_features Comparative features list + +- Hardware Capabilities: + - 2 transceiver card slots + - 64 MHz fixed clock rate +- FPGA Capabilities: + - 2 RX DDC chains in FPGA + - 2 TX DUC chains in FPGA (no TX CORDIC -\> uses DAC) + - sc16 sample modes - RX & TX + - Up to 8 MHz of RF BW with 16-bit samples + - sc8 sample mode - RX only + - Up to 16 MHz of RF BW with 8-bit samples + +\section usrp1_imgs Specify a Non-standard Image + +The standard USRP1 images installer comes with two FPGA images: +- **usrp1_fpga.rbf:** 2 DDCs + 2 DUCs +- **usrp1_fpga_4rx.rbf:** 4 DDCs + 0 DUCs + +By default, the USRP1 uses the FPGA image with 2 DDCs and 2 DUCs. +However, a device address parameter can be used to override the FPGA +image selection to use an alternate or a custom FPGA image. See the +images application notes for installing custom images. + +Example device address string representations to specify non-standard +firmware and/or FPGA images: + + fpga=usrp1_fpga_4rx.rbf + + -- OR -- + + fw=usrp1_fw_custom.ihx + + -- OR -- + + fpga=usrp1_fpga_4rx.rbf, fw=usrp1_fw_custom.ihx + +\section usrp1_emul Missing and Emulated Features + +The USRP1 FPGA does not have the necessary space to support the advanced +streaming capabilities that are possible with the newer USRP devices. +Some of these features are emulated in software to support the API. + +\subsection usrp1_emul_list List of emulated features + +- Setting the current device time +- Getting the current device time +- Transmitting at a specific time +- Transmitting a specific number of samples +- Receiving at a specific time +- Receiving a specific number of samples +- End of burst flags for transmit/receive +- Notification on late stream command +- Notification on late transmit packet +- Notification on underflow or overflow +- Notification on broken chain error + +<b>Note:</b> These emulated features rely on the host system's clock for +timed operations and therefore may not have sufficient precision for the +application. + +\subsection usrp1_emul_listmissing List of missing features + +- Start of burst flags for transmit/receive + +\section usrp1_hw Hardware Setup Notes + +\subsection usrp1_hw_extclk External clock modification + +The USRP device can be modified to accept an external clock reference instead of the 64MHz onboard reference. + - Solder SMA (**LTI-SASF54GT**) connector to **J2001**. + - Move 0 ohm 0603 resistor **R2029** to **R2030**. + - Move 0.01uF 0603 capacitor **C925** to **C926**. + - Remove 0.01uF 0603 capacitor **C924**. + +The new external clock needs to be a square wave between +7dBm and +15dBm. + +After the hardware modification, the user should burn the setting into +the EEPROM, so UHD software can initialize with the correct clock rate. +Run the following commands to record the setting into the EEPROM: + + cd <install-path>/lib/uhd/utils + ./usrp_burn_mb_eeprom --args=<optional device args> --values="mcr=<rate>" + +The user may override the clock rate specified in the EEPROM by using a +device address: Example: + + uhd_usrp_probe --args="mcr=52e6" + +*/ +// vim:ft=doxygen: |