Simultaneous FUD on QC2 DDS hardware

[sbourdeauducq]

The QC2 (clock lab) DDS hardware has one-hot selection signals, which makes it possible to FUD several channels at the same time.

[ghost]

The QC2 DDS hardware is AD9914. Where is this one-hot selection discussed
in the manual? I just checked but didn't see anything.

http://www.analog.com/media/en/technical-documentation/data-sheets/AD9914.pdf

On Sun, Jun 28, 2015 at 10:08 AM, Sébastien Bourdeauducq <
notifications@github.com> wrote:

The QC2 (clock lab) DDS hardware has one-hot selection signals, which
makes it possible to FUD several channels at the same time.

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#54.

[sbourdeauducq]

That has to do only with the connections external to the AD9914 chip.

[ghost]

You mean Pin 58 on J0 to J10 of 11-slot motherboard which is routed to
SELECT (pin 19) of SN74CBTLV3245A on the AD9914 daughter cards. The logic
chip is a latch for FUD-IN, RESET-IN, WRB-IN and RDB-IN. OK. I see. That's
convenient for simultaneous update.

On Mon, Jun 29, 2015 at 7:40 AM, Sébastien Bourdeauducq <
notifications@github.com> wrote:

That has to do only with the connections external to the chip.

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#54 (comment).

[sbourdeauducq]

It's not exactly what is normally called "latch", but yes.

[sbourdeauducq]

ARTIQ-Python rewrite of the DDS code is a good occasion for that. Only one-hot selection signals would need to be supported (#576).

[sbourdeauducq]

There seems to be no interest in this. Closing.