mirror of https://github.com/m-labs/artiq
120 lines
6.2 KiB
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120 lines
6.2 KiB
ReStructuredText
ARTIQ Phaser
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============
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This ARTIQ branch contains a proof-of-concept design of a GHz-datarate multichannel direct digital synthesizer (DDS) compatible with ARTIQ's RTIO channels.
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In later developments this proof-of-concept can be expanded to provide a two-tone output with spline modulation and multi-DAC synchronization.
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Ultimately it will be the basis for the ARTIQ Sayma Smart Arbitrary Waveform Generator project. See https://github.com/m-labs/sayma and https://github.com/m-labs/artiq-hardware.
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*Features*:
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* 4 channels
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* 500 MHz data rate per channel (KC705 limitation)
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* 4x interpolation to 2 GHz DAC sample rate
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* Real-time control over amplitude, frequency, phase of each channel through ARTIQ RTIO commands
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* Full configurability of the AD9154 and AD9516 through SPI with ARTIQ kernel support
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* All SPI registers and register bits exposed as human readable names
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* Parametrized JESD204B core (also capable of operation with eight lanes)
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* The code can be reconfigured. Possible example configurations are: support 2 channels at 1 GHz datarate, support 4 channels at 300 MHz data rate, no interpolation, and using mix mode to stress the second and third Nyquist zones (150-300 MHz and 300-450 MHz).
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The hardware required to use the ARTIQ phaser branch is a KC705 with an AD9154-FMC-EBZ plugged into the HPC connector and a low-noise 2 GHz reference clock.
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This work was supported by the Army Research Lab.
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The code that was developed for this project is located in several repositories:
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* In ARTIQ, the SAWG and Phaser code: https://github.com/m-labs/artiq/compare/phaser
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* The CORDIC core has been reused from the PDQ2 gateware https://github.com/m-labs/pdq2
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* The Migen/MiSoC JESD204B core: https://github.com/m-labs/jesd204b
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Installation
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------------
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These installation instructions are a short form of those in the ARTIQ manual.
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Please refer to and follow the ARTIQ manual for more details:
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https://m-labs.hk/artiq/manual-release-2/index.html
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* Set up a new conda environment and activate it.
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* Install the standard ARTIQ runtime/install dependencies.
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See ``conda/artiq/meta.yaml`` for a list.
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They are all packaged as conda packages in ``m-labs/main``.
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* Install the standard ARTIQ build dependencies.
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They are all available as conda packages in m-labs/main or m-labs/dev for linux-64:
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- migen =0.4
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- misoc =0.4
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- llvm-or1k =3.8
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- rust-core-or1k
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- cargo
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- binutils-or1k-linux >=2.27
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* Install a recent version of Vivado (tested and developed with 2016.2).
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* Checkout the ARTIQ phaser branch and the JESD204B core: ::
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mkdir ~/src
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cd ~/src
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git clone --recursive -b phaser https://github.com/m-labs/artiq.git
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git clone https://github.com/m-labs/jesd204b.git
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cd jesd204b
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python setup.py develop
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cd ../artiq
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python setup.py develop
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Setup
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-----
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* Setup the KC705 (jumpers, etc.) observing the ARTIQ manual.
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VADJ does not need to be changed.
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* On the AD9154-FMC-EBZ put jumpers:
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- on XP1, between pin 5 and 6 (will keep the PIC in reset)
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- on JP3 (will force output enable on FXLA108)
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* Compile the ARTIQ Phaser bitstream, bios, and runtime (c.f. ARTIQ manual): ::
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python -m artiq.gateware.targets.kc705 -H phaser --toolchain vivado
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* Run the following OpenOCD command to flash the ARTIQ phaser design: ::
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openocd -f board/kc705.cfg -c "init; jtagspi_init 0 bscan_spi_xc7k325t.bit; jtagspi_program misoc_phaser_kc705/gateware/top.bin 0x000000; jtagspi_program misoc_phaser_kc705/software/bios/bios.bin 0xaf0000; jtagspi_program misoc_phaser_kc705/software/runtime/runtime.fbi 0xb00000; xc7_program xc7.tap; exit"
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The proxy bitstream ``bscan_spi_xc7k325t.bit`` can be found at https://github.com/jordens/bscan_spi_bitstreams or in any ARTIQ conda package for the KC705.
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See the source code of ``artiq_flash.py`` from ARTIQ for more details.
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If you are using the OpenOCD Conda package:
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* locate the OpenOCD scripts directory with: ``python3 -c "import artiq.frontend.artiq_flash as af; print(af.scripts_path)"``
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* add ``-s <scripts directory>`` to the OpenOCD command line.
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* Refer to the ARTIQ documentation to configure an IP address and other settings for the transmitter device.
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If the board was running stock ARTIQ before, the settings will be kept.
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* 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.
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The external RTIO clock, DAC deviceclock, FPGA deviceclock, and SYSREF are derived from this signal.
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* An example device database, several status and test scripts are provided in ``artiq/examples/phaser/``. ::
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cd artiq/examples/phaser
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* Edit ``device_db.pyon`` to match the hostname or IP address of the core device.
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* The ``startup_clock`` needs to be set to internal (``i``) for bootstrapping the clock distribution tree.
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* Compile and flash the startup kernel in ``artiq/examples/phaser/startup_kernel.py``.
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* Erase any possible idle kernels.
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* Use ``ping`` and ``flterm`` to verify that the core device starts up and boots correctly.
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Usage
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-----
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* After each boot, run the ``dac_setup.py`` experiment to establish the JESD204B links (``artiq_run repository/dac_setup.py``).
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* Run ``artiq_run repository/ad9154_test_status.py`` to retrieve and print several status registers from the AD9154 DAC.
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* Run ``artiq_run repository/ad9154_test_prbs.py`` to test the JESD204B PHY layer for bit errors. Reboot the core device afterwards.
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* Run ``artiq_run repository/ad9154_test_stpl.py`` to executes a JESD204B short transport layer test.
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* Run ``artiq_run repository/sawg.py`` for an example that sets up amplitudes, frequencies, and phases on all four DDS channels.
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* Run ``artiq_run repository/demo.py`` for an example that exercises several different use cases of synchronized phase, amplitude, and frequency updates.
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for an example that exercises several different use cases of synchronized phase, amplitude, and frequency updates.
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* Implement your own experiments using the SAWG channels.
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* Verify clock stability between the 2 GHz reference clock and the DAC outputs.
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* Changes to the AD9154 configuration can also be performed at runtime in experiments.
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See the example ``dac_setup.py``.
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This can e.g. be used to enable and evaluate mix mode without having to change any other code (bitstream/bios/runtime/startup_kernel).
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