forked from M-Labs/artiq
Phaser: expose coarse mixer and document need to enable the DAC-mixer.
in some use cases a larger tunable range than available via the DUC may be needed. Some use cases may wish to combine the coarse mixer with the DUC to extend the tunable range. Signed-off-by: Marius Weber <marius.weber@physics.ox.ac.uk>
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@ -570,6 +570,27 @@ class Phaser:
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self.dac_write(0x1f, config1f & ~int32(1 << 1))
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self.dac_write(0x1f, config1f | (1 << 1))
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@kernel
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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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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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# values recommended in data-sheet
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# 0 1 2 3 4 -3 -2 -1
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vals = [0b0000, 0b1000, 0b0100, 0b1100, 0b0010, 0b1010, 0b0001, 0b1110]
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cmix = vals[fs_8_step%8]
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config0d = self.dac_read(0x0d)
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delay(.1*ms)
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self.dac_write(0x0d, (config0d & ~(0b1111 << 12)) | (cmix << 12))
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@kernel
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def get_dac_alarms(self):
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"""Read the DAC alarm flags.
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@ -784,6 +805,9 @@ class PhaserChannel:
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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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:param ftw: NCO frequency tuning word (32 bit)
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"""
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self.phaser.dac_write(0x15 + (self.index << 1), ftw >> 16)
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@ -794,6 +818,9 @@ class PhaserChannel:
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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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: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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"""
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