| USRP Hardware Driver and USRP Manual Version: 4.8.0.makepkg-0-g308126a4 UHD and USRP Manual |

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USRP-E1x0 Series

Note: The USPR E1x0-Series is no longer supported with this version of UHD. This page is kept here for reference purposes only.

# Comparative features list

- Hardware Capabilities:
  - 1 transceiver card slot
  - Internal PPS reference input
  - Internal 10 MHz reference input
  - Configurable clock rate (defaults to 64 MHz)
  - Internal GPSDO option
- FPGA Capabilities:
  - 2 RX DDC chains in FPGA
  - 1 TX DUC chain in FPGA
  - Timed commands in FPGA
  - Timed sampling in FPGA
  - sc8 and sc16 sample modes
    - Up to 8 MHz of RF BW with 16-bit samples
    - Up to 16 MHz of RF BW with 8-bit samples

# Specify a Non-standard Image

UHD software 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.

Example device address string representations to specify non-standard FPGA image:

    fpga=usrp_e100_custom.bin

# 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 32 MHz and 64 MHz are available. A few notable rates are:

- 64 MHz: maximum rate of the codec chip
- 61.44 MHz: good for UMTS/WCDMA applications
- 52 MHz: good for GSM applications

## Set 61.44MHz - uses external VCXO

To use the 61.44 MHz 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).

  Note:** See instructions below to communicate the desired clock rate to UHD software.

## 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).

To communicate the desired clock rate into UHD software, specify the a special device address argument, where the key is `master_clock_rate` and the value is a rate in Hz. Example:

    uhd_usrp_probe --args="master_clock_rate=52e6"

# 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 uhd::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 uhd::clock_config_t.

## PPS - Pulse Per Second

An external 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 5 Vpp

Test the PPS input with the following app (`<args>` are device address arguments, optional if only one USRP device is on your machine):

    cd <install-path>/lib/uhd/examples
    ./test_pps_input --args=<args>

## Internal GPSDO

Please see the Internal GPSDO (USRP-N2x0/E1X0 Models) for information on configuring and using the internal GPSDO.

UHD software will always try to detect an installed GPSDO at runtime. It is not necessary to burn a special EEPROM value for GPSDO detection.

# Hardware Setup Notes

## Front panel LEDs

The LEDs on the front panel can be useful in debugging hardware and software issues. The LEDs reveal the following about the state of the device:

- LED A: transmitting
- LED B: PPS signal
- LED C: receiving
- LED D: FPGA loaded
- LED E: reference lock
- LED F: board power

# Miscellaneous

## Available Sensors

The following sensors are available; they can be queried through the API.

- ref_locked: clock reference locked (internal/external)
- other sensors are added when the GPSDO is enabled