2118-2128: (max. -> min.) sustained event separation

2118-2128.tex

@@ -607,13 +607,23 @@ Typically, with the coarse RTIO clock at 125 MHz, a \texttt{ClockGen} channel ca
 \inputcolorboxminted{firstline=72,lastline=75}{examples/ttl.py}
 
 \newpage
-\subsection{Maximum Sustained Event Separation}
+\subsection{Minimum Sustained Event Separation}
-The maximum sustained event separation is the least amount of time separation between input gated events, in which all gated edges can be continuously \& reliabily timestamped by the RTIO system without causing \texttt{RTIOOverflow} exceptions.
+The minimum sustained event separation is the least amount of time separation between input gated events, in which all gated edges can be continuously \& reliabily timestamped by the RTIO system without causing \texttt{RTIOOverflow} exceptions.
 The following \texttt{run()} function finds the separation by approximating the time of running \texttt{timestamp\char`_mu()} as a constant. Import the \texttt{time} library to use \texttt{time.sleep()}.
 
-\inputcolorboxminted{firstline=60,lastline=92}{examples/ttl_in.py}
+\inputcolorboxminted{firstline=63,lastline=98}{examples/ttl_in.py}
 
-The result fluctuates at around 650ns with Kasli v1.1.
+\begin{center}
+\begin{table}[H]
+    \captionof{table}{Minimum sustained event separation of different carrier}
+    \centering
+    \begin{tabular}{|c|c|c|}
+    \hline
+    Carrier  & Kasli v1.1 & Kasli-SoC \\ \hline
+    Duration & 650 ns     & 600 ns    \\ \hline
+    \end{tabular}
+    \end{table}
+\end{center}
 
 \section{Ordering Information}
 To order, please visit \url{https://m-labs.hk} and select the 2118 BNC-TTL/2128 SMA-TTL in the ARTIQ Sinara crate configuration tool. The card may also be ordered separately by writing to \url{mailto:sales@m-labs.hk}.

examples/ttl_in.py

@@ -51,6 +51,9 @@ class ExternalTrigger(EnvExperiment):
         self.ttlout.pulse(1*us)
 
 
+import time
+
+
 class MeanTimestampDuration(EnvExperiment):
     def build(self):
         self.setattr_device("core")
@@ -72,7 +75,10 @@ class MeanTimestampDuration(EnvExperiment):
 
         # Guarantee t0 > gate_end_mu
         # Otherwise timestamp_mu may wait for pulses till gate_end_mu
-        self.rpc_sleep(1*ms)
+        rtio_time_mu = self.core.get_rtio_counter_mu()
+        sleep_mu = float(gate_end_mu - rtio_time_mu)
+        self.rpc_sleep(self.core.mu_to_seconds(sleep_mu))
+
         t0 = self.core.get_rtio_counter_mu()
         while self.ttlin.timestamp_mu(gate_end_mu) >= 0:
             pass