From c54b6e2f3c63ba0d1153395c56fc0ba688968c36 Mon Sep 17 00:00:00 2001 From: Robert Jordens Date: Wed, 5 Oct 2016 19:24:34 +0200 Subject: [PATCH] phaser: add README --- README_PHASER.rst | 104 +++++++++++++++++++++++++++++++++++++ doc/manual/core_device.rst | 8 --- 2 files changed, 104 insertions(+), 8 deletions(-) create mode 100644 README_PHASER.rst diff --git a/README_PHASER.rst b/README_PHASER.rst new file mode 100644 index 000000000..a1a4fc653 --- /dev/null +++ b/README_PHASER.rst @@ -0,0 +1,104 @@ +ARTIQ Phaser +============ + +This ARTIQ branch contains a proof-of-concept design of a GHz-datarate multichannel direct digital synthesizer (DDS) compatible with ARTIQ's RTIO channels. +In later developments this proof-of-concept can be expanded to provide a two-tone output with spline modulation and multi-DAC synchronization. +Ultimately it will be the basis for the ARTIQ Sayma project. See https://github.com/m-labs/sayma and https://github.com/m-labs/artiq-hardware + +The hardware required is a KC705 with an AD9154-FMC-EBZ plugged into the HPC connector and a low-jitter 2 GHz reference clock. + +Features: + + * 4 channels + * 500 MHz data rate per channel (KC705 limitation) + * 4x interpolation to 2 GHz DAC sample rate + * Real-time control over amplitude, frequency, phase through ARTIQ RTIO + channels + * Full configurability of the AD9154 and AD9516 through SPI with ARTIQ kernel + support + * All SPI registers and register bits exposed as human readable names + * Parametrized JESD204B core (also capable of operation with eight lanes) + * The code can be reconfigured, e.g. to support 2 channels at 1 GHz datarate or to 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). + +This work was supported by the Army Research Lab. + +The additions and modifications to ARTIQ that were implemented for this project are: + + * In ARTIQ, the SAWG and Phaser code: https://github.com/m-labs/artiq/compare/phaser + * The CORDIC core has been reused from the PDQ2 gateware + https://github.com/m-labs/pdq2 + * The Migen/MiSoC JESD204B core: https://github.com/enjoy-digital/litejesd204b +: + +Installation +------------ + +These installation instructions are a short form of those in the ARTIQ manual. +Please refer to the manual for more details: +https://m-labs.hk/artiq/manual-release-2/index.html + +* Set up a new conda environment and activate it. +* Checkout the ARTIQ phaser branch:: + git clone -b phaser https://github.com/m-labs/artiq.git + +* Install the standard ARTIQ runtime/install dependencies. + See ``conda/artiq/meta.yaml`` for a list. + They are all packaged as conda packages in ``m-labs/main``. + +* Install the standard ARTIQ build dependencies. + They are all available as conda packages in m-labs/main at least for linux-64: + + - migen 0.4 + - misoc 0.3 + - llvm-or1k + - rust-core-or1k + - cargo + - binutils-or1k-linux >=2.27 + +* Vivado + +Follow the ARTIQ manual's chapter on installing. + + +Setup +----- + +* Setup the KC705 (VADJ, jumpers, etc.) observing the ARTIQ manual. +* On the AD9154-FMC-EBZ put jumpers: + + - on XP1, between pin 5 and 6 (will keep the PIC in reset) + - on JP3 (will force output enable on FXLA108) + +* Compile the ARTIQ Phaser bitstream, bios, and runtime (c.f. ARTIQ manual)::: + python -m artiq.gateware.targets.kc705 -H phaser --toolchain vivado + +* Run the following OpenOCD commands to flash the ARTIQ transmitter design::: + 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 + + 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. See the source code of ``artiq_flash.py`` from ARTIQ for more details. + +* Refer to the ARTIQ documentation to configure an IP address and other settings for the transmitter device. + 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. +* 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``. + +Usage +----- + +* An example device database, several status and test scripts are provided in ``artiq/examples/phaser/``. +* run ``artiq_run sawg.py`` for an example that sets up amplitudes, frequencies, + and phases on all four DDS channels. +* 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 ``startup_kernel.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). diff --git a/doc/manual/core_device.rst b/doc/manual/core_device.rst index 695248ba6..389e11fa4 100644 --- a/doc/manual/core_device.rst +++ b/doc/manual/core_device.rst @@ -178,14 +178,6 @@ The SAWG channels start with RTIO channel number 4, each occupying 3 channels. The board has one non-RTIO SPI bus that is accessible through :mod:`artiq.coredevice.ad9154`. -* Setup the KC705 observing the notes above and as laid out in :ref:`configuring-core-device`. -* 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. -* The ``startup_clock`` needs to be set to internal (``i``) for bootstrapping the clock distribution tree. - See :ref:`configuring-core-device`. -* Compile and flash the startup kernel in ``artiq/examples/phaser/startup_kernel.py``. -* An example ``device_db.pyon`` is provided in ``artiq/examples/phaser/device_db.pyon``. - Pipistrello -----------