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phaser: update README

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Robert Jördens 2016-10-14 13:21:54 +02:00
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README_PHASER.rst
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@ -92,18 +92,28 @@ Setup
If the board was running stock ARTIQ before, the settings will be kept.
* A 2 GHz of roughly 10 dBm (0.2 to 3.4 V peak-to-peak into 50 Ohm) must be connected to the AD9154-FMC-EBZ J1.
The external RTIO clock, DAC deviceclock, FPGA deviceclock, and SYSREF are derived from this signal.
* An example device database, several status and test scripts are provided in ``artiq/examples/phaser/``. ::
cd artiq/examples/phaser
* Edit ``device_db.pyon`` to match the hostname or IP address of the core device.
* The ``startup_clock`` needs to be set to internal (``i``) for bootstrapping the clock distribution tree.
* Compile and flash the startup kernel in ``artiq/examples/phaser/startup_kernel.py``.
* Erase any possible idle kernels.
* Use ``ping`` and ``flterm`` to verify that the core device starts up and boots correctly.
Usage
-----
* An example device database, several status and test scripts are provided in ``artiq/examples/phaser/``.
* After each boot, run the ``dac_setup.py`` experiment to establish the JESD204B links (``artiq_run repository/dac_setup.py``).
* Run ``artiq_run repository/ad9154_test_status.py`` to retrieve and print several status registers from the AD9154 DAC.
* Run ``artiq_run repository/ad9154_test_prbs.py`` to test the JESD204B PHY layer for bit errors. Reboot the core device afterwards.
* Run ``artiq_run repository/ad9154_test_stpl.py`` to executes a JESD204B short transport layer test.
* Run ``artiq_run repository/sawg.py`` for an example that sets up amplitudes, frequencies, and phases on all four DDS channels.
* Run ``artiq_run repository/demo.py`` for an example that exercises several different use cases of synchronized phase, amplitude, and frequency updates.
for an example that exercises several different use cases of synchronized phase, amplitude, and frequency updates.
* Implement your own experiments using the SAWG channels.
* Verify clock stability between the 2 GHz reference clock and the DAC outputs.
* Verify phase alignment between the DAC channels.
* Changes to the AD9154 configuration can also be performed at runtime in experiments.
See the example ``dac_setup.py``.
This can e.g. be used to enable and evaluate mix mode without having to change any other code (bitstream/bios/runtime/startup_kernel).