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4410-4412: add eem mode docs

nix_fix
occheung 2022-06-07 12:46:23 +08:00
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4410-4412.tex
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@ -691,6 +691,7 @@ Harmonic content of the DDS signals from 4410 DDS Urukul is tabulated below\foot
\end{multicols}
\newpage
\section{Urukul Mode Configurations}
Mode of operation is specified by a DIP switch.
The DIP switch can be found at the top right corner of the card.
@ -720,6 +721,28 @@ The following table summarizes the required setting for each mode.
\end{multicols}
Note for Default mode: Switching on DIP Switch 3 enables the options that distribute the synchronization signals externally.
However, ARTIQ \& the core device (Kasli/Kasli-SoC) do not interact with these signals.
\section{Urukul 1-EEM/2-EEM Modes}
4410/4412 DDS Urukul can operate with either 1 or 2 EEM connections.
It is in 1-EEM mode when only EEM0 is connected, 2-EEM mode when both EEM0 \& EEM1 are connected.
2-EEM mode provides these additional features in comparison to 1-EEM mode.
\begin{itemize}
\item 1 ns temporal resolution RF switches \\
Without EEM1, the only way to access the switches is through the CPLD using SPI. \\
With EEM1, RF switches can be controlled as a TTL output through the LVDS transceiver.
1 ns temporal resolution is achieved using the ARTIQ RTIO system.
\item SU-Servo (4410 DDS Urukul feature) \\
SU-Servo requires both EEM0 \& EEM1 to control multiple DDS channels simultaneously using the QSPI interface.
\item Distribute synchronization signals from Urukul (4410 DDS Urukul feature) \\
Synchronization signals can only be distributed externally through EEM1.
ARTIQ \& the core device (Kasli/Kasli-SoC) will never interact with these signals.
\end{itemize}
\newpage
\section{Example ARTIQ code}