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ad9910: Clarify chip_select range [nfc]
`assert 3 <= chip_select <= 7` is rather opaque without looking at the CPLD source code otherwise.
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@ -39,7 +39,8 @@ class AD9910:
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the digital step attenuator, and the RF switch.
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:param chip_select: Chip select configuration. On Urukul this is an
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encoded chip select and not "one-hot".
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encoded chip select and not "one-hot": 3 to address multiple chips
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(as configured through CFG_MASK_NU), 4-7 for individual channels.
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:param cpld_device: Name of the Urukul CPLD this device is on.
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:param sw_device: Name of the RF switch device. The RF switch is a
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TTLOut channel available as the :attr:`sw` attribute of this instance.
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