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phaser: Improve documentation of DAC settings
1. Clarify which features require additional configuration via the `dac` constructor argument. 2. Document when DAC settings apply immediatly/are staged. 3. Document how staged DAC settings may be applied 4. Calrify operation of `dac_sync` Signed-off-by: Marius Weber <marius.weber@physics.ox.ac.uk>
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@ -86,7 +86,8 @@ class Phaser:
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LVDS bus operating at 1 Gb/s per pin pair and processed in the DAC (Texas
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Instruments DAC34H84). On the DAC 2x interpolation, sinx/x compensation,
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quadrature modulator compensation, fine and coarse mixing as well as group
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delay capabilities are available.
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delay capabilities are available. If desired, these features my be
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configured via the `dac` dictionary.
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The latency/group delay from the RTIO events setting
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:class:`PhaserOscillator` or :class:`PhaserChannel` DUC parameters all the
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@ -574,7 +575,18 @@ class Phaser:
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@kernel
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def dac_sync(self):
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"""Trigger DAC synchronisation for both output channels.
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If the DAC-NCO is enabled, this applies NCO frequency changes."""
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The DAC sif_sync is de-asserts, then asserted. The synchronisation is
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triggered on assertion.
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By default, the fine-mixer (NCO) and QMC are synchronised. This
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includes applying the latest register settings.
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The synchronisation sources may be configured through the `syncsel_x`
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fields in the `dac` configuration dictionary (see `__init__()`).
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.. note:: Synchronising the NCO clears the phase-accumulator
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"""
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config1f = self.dac_read(0x1f)
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delay(.1*ms)
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self.dac_write(0x1f, config1f & ~int32(1 << 1))
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@ -584,12 +596,13 @@ class Phaser:
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def set_dac_cmix(self, fs_8_step):
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"""Set the DAC coarse mixer frequency for both channels
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Use of the coarse mixer requires the DAC mixer to be enabled. The mixer
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can be configured via the `dac` configuration dictionary (see
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`__init__()`).
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The selected coarse mixer frequency becomes active without explicit
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synchronisation.
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Use of the coarse mixer requires the DAC mixer to be enabled. The mixer
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can be configured via the `dac` device_db entries.
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:param fs_8_step: coarse mixer frequency shift in 125 MHz steps. This
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should be an integer between -3 and 4 (inclusive).
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"""
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@ -813,10 +826,12 @@ class PhaserChannel:
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@kernel
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def set_nco_frequency_mu(self, ftw):
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"""Set the NCO frequency.
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The frequency is only applied after DAC synchronisation.
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Use of the NCO requires the DAC mixer to be enabled. The mixer can be
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configured via the `dac` device_db entries.
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This method stages the new NCO frequency, but does not apply it.
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Use of the DAC-NCO requires the DAC mixer and NCO to be enabled. These
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can be configured via the `dac` configuration dictionary (see
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`__init__()`).
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:param ftw: NCO frequency tuning word (32 bit)
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"""
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@ -826,10 +841,12 @@ class PhaserChannel:
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@kernel
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def set_nco_frequency(self, frequency):
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"""Set the NCO frequency in SI units.
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The frequency is only applied after DAC synchronisation.
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Use of the NCO requires the DAC mixer to be enabled. The mixer can be
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configured via the `dac` device_db entries.
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This method stages the new NCO frequency, but does not apply it.
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Use of the DAC-NCO requires the DAC mixer and NCO to be enabled. These
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can be configured via the `dac` configuration dictionary (see
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`__init__()`).
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:param frequency: NCO frequency in Hz (passband from -400 MHz
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to 400 MHz, wrapping around at +- 500 MHz)
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@ -841,6 +858,16 @@ class PhaserChannel:
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def set_nco_phase_mu(self, pow):
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"""Set the NCO phase offset.
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By default, the new NCO phase applies on completion of the SPI
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transfer. This also causes a staged NCO frequency to be applied.
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Different triggers for applying nco settings may be configured through
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the `syncsel_mixerxx` fields in the `dac` configuration dictionary (see
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`__init__()`).
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Use of the DAC-NCO requires the DAC mixer and NCO to be enabled. These
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can be configured via the `dac` configuration dictionary (see
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`__init__()`).
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:param pow: NCO phase offset word (16 bit)
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"""
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self.phaser.dac_write(0x12 + self.index, pow)
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@ -849,6 +876,16 @@ class PhaserChannel:
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def set_nco_phase(self, phase):
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"""Set the NCO phase in SI units.
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By default, the new NCO phase applies on completion of the SPI
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transfer. This also causes a staged NCO frequency to be applied.
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Different triggers for applying nco settings may be configured through
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the `syncsel_mixerxx` fields in the `dac` configuration dictionary (see
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`__init__()`).
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Use of the DAC-NCO requires the DAC mixer and NCO to be enabled. These
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can be configured via the `dac` configuration dictionary (see
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`__init__()`).
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:param phase: NCO phase in turns
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"""
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pow = int32(round(phase*(1 << 16)))
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