forked from sinara-hw/datasheets
551 lines
22 KiB
TeX
551 lines
22 KiB
TeX
\documentclass[10pt]{datasheet}
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\usepackage{palatino}
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\usepackage{textgreek}
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\usepackage{minted}
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\usepackage{tcolorbox}
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\usepackage{etoolbox}
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\BeforeBeginEnvironment{minted}{\begin{tcolorbox}[colback=white]}%
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\AfterEndEnvironment{minted}{\end{tcolorbox}}%
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\usepackage[justification=centering]{caption}
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\usepackage[utf8]{inputenc}
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\usepackage[english]{babel}
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\usepackage[english]{isodate}
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\usepackage{graphicx}
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\usepackage{subfig}
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\usepackage{tikz}
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\usepackage{pgfplots}
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\usepackage{circuitikz}
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\usetikzlibrary{calc}
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\usetikzlibrary{fit,backgrounds}
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\title{2245 LVDS-TTL}
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\author{M-Labs Limited}
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\date{January 2022}
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\revision{Revision 2}
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\companylogo{\includegraphics[height=0.73in]{artiq_sinara.pdf}}
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\begin{document}
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\maketitle
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\section{Features}
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\begin{itemize}
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\item{16 LVDS channels.}
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\item{Input and output capable.}
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\item{No galvanic isolation.}
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\item{High speed and low jitter.}
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\item{RJ45 connectors.}
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\end{itemize}
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\section{Applications}
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\begin{itemize}
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\item{Photon counting.}
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\item{External equipment trigger.}
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\item{Optical shutter control.}
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\item{Serial communication to remote devices.}
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\end{itemize}
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\section{General Description}
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The 2245 LVDS-TTL card is a 4hp EEM module.
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It adds general-purpose digital I/O capabilities to carrier cards such as 1124 Kasli and 1125 Kasli-SoC.
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Each card provides sixteen digital channels each, controlled through 2 EEM connectors.
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Each EEM connector controls eight channels independently.
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Single EEM operation is possible.
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Each RJ45 connector exposes four digital channels in the LVDS format.
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The direction (input or output) of each channel can be selected using DIP switches.
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Outputs are intended to drive 100\textOmega~loads, inputs are 100\textOmega~terminated.
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This card can achieve higher speed and lower jitter than the isolated 2118/2128 BNC/SMA-TTL cards.
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Only shielded Ethernet Cat-6 cables should be connected.
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% Switch to next column
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\vfill\break
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\newcommand*{\MyLabel}[3][2cm]{\parbox{#1}{\centering #2 \\ #3}}
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\newcommand*{\MymyLabel}[3][4cm]{\parbox{#1}{\centering #2 \\ #3}}
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\begin{figure}[h]
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\centering
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\scalebox{0.88}{
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\begin{circuitikz}[european, scale=0.95, every label/.append style={align=center}]
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% RJ45 Connectors
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\draw (0, 2.8) node[twoportshape, t={\MyLabel{RJ45}{CH 0-3}}, circuitikz/bipoles/twoport/width=1.4, scale=0.5, rotate=-90] (eth0) {};
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\draw (0, 1.0) node[twoportshape, t={\MyLabel{RJ45}{CH 4-7}}, circuitikz/bipoles/twoport/width=1.4, scale=0.5, rotate=-90] (eth1) {};
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\draw (0, -1.0) node[twoportshape, t={\MyLabel{RJ45}{CH 8-11}}, circuitikz/bipoles/twoport/width=1.4, scale=0.5, rotate=-90] (eth2) {};
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\draw (0, -2.8) node[twoportshape, t={\MyLabel{RJ45}{CH 12-15}}, circuitikz/bipoles/twoport/width=1.4, scale=0.5, rotate=-90] (eth3) {};
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% Repeaters for channels
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% Channel 7 repeaters
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\draw (1.8, 0.4) node[twoportshape, t={\MyLabel{CH 7}{Repeaters}}, circuitikz/bipoles/twoport/width=1.6, scale=0.5] (rep7) {};
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% Omission dots
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\node at (1.8, 0.8)[circle,fill,inner sep=0.7pt]{};
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\node at (1.8, 1.0)[circle,fill,inner sep=0.7pt]{};
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\node at (1.8, 1.2)[circle,fill,inner sep=0.7pt]{};
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% Channel 4 repeaters
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\draw (1.8, 1.6) node[twoportshape, t={\MyLabel{CH 4}{Repeaters}}, circuitikz/bipoles/twoport/width=1.6, scale=0.5] (rep4) {};
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% Channel 3 repeaters
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\draw (1.8, 2.2) node[twoportshape, t={\MyLabel{CH 3}{Repeaters}}, circuitikz/bipoles/twoport/width=1.6, scale=0.5] (rep3) {};
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% Omission dots
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\node at (1.8, 2.6)[circle,fill,inner sep=0.7pt]{};
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\node at (1.8, 2.8)[circle,fill,inner sep=0.7pt]{};
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\node at (1.8, 3.0)[circle,fill,inner sep=0.7pt]{};
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% Channel 0 repeaters
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\draw (1.8, 3.4) node[twoportshape, t={\MyLabel{CH 0}{Repeaters}}, circuitikz/bipoles/twoport/width=1.6, scale=0.5] (rep0) {};
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% Channel 8 repeaters
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\draw (1.8, -0.4) node[twoportshape, t={\MyLabel{CH 8}{Repeaters}}, circuitikz/bipoles/twoport/width=1.6, scale=0.5] (rep8) {};
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% Omission dots
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\node at (1.8, -0.8)[circle,fill,inner sep=0.7pt]{};
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\node at (1.8, -1.0)[circle,fill,inner sep=0.7pt]{};
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\node at (1.8, -1.2)[circle,fill,inner sep=0.7pt]{};
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% Channel 11 repeaters
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\draw (1.8, -1.6) node[twoportshape, t={\MyLabel{CH 11}{Repeaters}}, circuitikz/bipoles/twoport/width=1.6, scale=0.5] (rep11) {};
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% Channel 12 repeaters
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\draw (1.8, -2.2) node[twoportshape, t={\MyLabel{CH 12}{Repeaters}}, circuitikz/bipoles/twoport/width=1.6, scale=0.5] (rep12) {};
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% Omission dots
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\node at (1.8, -2.6)[circle,fill,inner sep=0.7pt]{};
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\node at (1.8, -2.8)[circle,fill,inner sep=0.7pt]{};
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\node at (1.8, -3.0)[circle,fill,inner sep=0.7pt]{};
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% Channel 15 repeaters
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\draw (1.8, -3.4) node[twoportshape, t={\MyLabel{CH 15}{Repeaters}}, circuitikz/bipoles/twoport/width=1.6, scale=0.5] (rep15) {};
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% Direction switches
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\draw (4.6, 0.4) node[twoportshape,t=\MymyLabel{Per-channel \phantom{spac} x8 }{Input/Output Switch}, circuitikz/bipoles/twoport/width=2.7, scale=0.5] (ioswitch0) {};
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\draw (4.6, -0.4) node[twoportshape,t=\MymyLabel{Per-channel \phantom{spac} x8 }{Input/Output Switch}, circuitikz/bipoles/twoport/width=2.7, scale=0.5] (ioswitch1) {};
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\begin{scope}[xshift=5cm, yshift=0.65cm, scale=0.12, every node/.style={scale=0.1}, rotate=-90 ]
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\draw (0.4, 0) to[short,-o](0.75, 0);
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\draw (0.78, 0)-- +(30: 0.46);
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\draw (1.25, 0)to[short,o-](1.6, 0);
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\end{scope}
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\begin{scope}[xshift=5cm, yshift=-0.15cm, scale=0.12, every node/.style={scale=0.1}, rotate=-90 ]
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\draw (0.4, 0) to[short,-o](0.75, 0);
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\draw (0.78, 0)-- +(30: 0.46);
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\draw (1.25, 0)to[short,o-](1.6, 0);
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\end{scope}
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% I2C I/O expanders
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\draw (4.6, 1.6) node[twoportshape,t=\MymyLabel{IO Expander}{for I2C Bus}, circuitikz/bipoles/twoport/width=2.7, scale=0.5] (i2c0) {};
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\draw (4.6, -1.6) node[twoportshape,t=\MymyLabel{IO Expander}{for I2C Bus}, circuitikz/bipoles/twoport/width=2.7, scale=0.5] (i2c1) {};
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% 2 Aesthetic EEPROMs
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\draw (4.6, 2.2) node[twoportshape,t={EEPROM}, circuitikz/bipoles/twoport/width=2.7, scale=0.5] (eeprom0) {};
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\draw (4.6, -2.2) node[twoportshape,t={EEPROM}, circuitikz/bipoles/twoport/width=2.7, scale=0.5] (eeprom1) {};
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% EEMs from core device / controllers
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\draw (7.2, 1.9) node[twoportshape, t={EEM Port 0}, circuitikz/bipoles/twoport/width=3.6, scale=0.7, rotate=-90] (eem0) {};
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\draw (7.2, -1.9) node[twoportshape, t={EEM Port 1}, circuitikz/bipoles/twoport/width=3.6, scale=0.7, rotate=-90] (eem1) {};
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% Connect RJ45 to LVDS DIO channels
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% CH 0
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\draw [latexslim-] (rep0.west) -- (0.7, 3.4);
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\draw [-] (0.7, 3.4) -- (0.7, 3.1);
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\draw [-latexslim] (0.7, 3.1) -- (0.25, 3.1);
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% CH 1
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\draw [latexslim-latexslim] (0.25, 2.9) -- (0.9, 2.9);
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\node [label=center:\tiny{CH 1}] at (1.2, 2.9) {};
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% CH 2
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\draw [latexslim-latexslim] (0.25, 2.7) -- (0.9, 2.7);
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\node [label=center:\tiny{CH 2}] at (1.2, 2.7) {};
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% CH 3
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\draw [latexslim-] (rep3.west) -- (0.7, 2.2);
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\draw [-] (0.7, 2.2) -- (0.7, 2.5);
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\draw [-latexslim] (0.7, 2.5) -- (0.25, 2.5);
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% CH 4
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\draw [latexslim-] (rep4.west) -- (0.7, 1.6);
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\draw [-] (0.7, 1.6) -- (0.7, 1.3);
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\draw [-latexslim] (0.7, 1.3) -- (0.25, 1.3);
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% CH 5
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\draw [latexslim-latexslim] (0.25, 1.1) -- (0.9, 1.1);
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\node [label=center:\tiny{CH 5}] at (1.2, 1.1) {};
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% CH 6
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\draw [latexslim-latexslim] (0.25, 0.9) -- (0.9, 0.9);
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\node [label=center:\tiny{CH 6}] at (1.2, 0.9) {};
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% CH 7
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\draw [latexslim-] (rep7.west) -- (0.7, 0.4);
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\draw [-] (0.7, 0.4) -- (0.7, 0.7);
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\draw [-latexslim] (0.7, 0.7) -- (0.25, 0.7);
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% CH 8
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\draw [latexslim-] (rep8.west) -- (0.7, -0.4);
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\draw [-] (0.7, -0.4) -- (0.7, -0.7);
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\draw [-latexslim] (0.7, -0.7) -- (0.25, -0.7);
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% CH 9
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\draw [latexslim-latexslim] (0.25, -0.9) -- (0.9, -0.9);
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\node [label=center:\tiny{CH 9}] at (1.2, -0.9) {};
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% CH 10
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\draw [latexslim-latexslim] (0.25, -1.1) -- (0.9, -1.1);
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\node [label=center:\tiny{CH 10}] at (1.2, -1.1) {};
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% CH 11
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\draw [latexslim-] (rep11.west) -- (0.7, -1.6);
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\draw [-] (0.7, -1.6) -- (0.7, -1.3);
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\draw [-latexslim] (0.7, -1.3) -- (0.25, -1.3);
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% CH 12
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\draw [latexslim-] (rep12.west) -- (0.7, -2.2);
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\draw [-] (0.7, -2.2) -- (0.7, -2.5);
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\draw [-latexslim] (0.7, -2.5) -- (0.25, -2.5);
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% CH 13
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\draw [latexslim-latexslim] (0.25, -2.7) -- (0.9, -2.7);
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\node [label=center:\tiny{CH 13}] at (1.2, -2.7) {};
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% CH 14
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\draw [latexslim-latexslim] (0.25, -2.9) -- (0.9, -2.9);
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\node [label=center:\tiny{CH 14}] at (1.2, -2.9) {};
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% CH 15
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\draw [latexslim-] (rep15.west) -- (0.7, -3.4);
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\draw [-] (0.7, -3.4) -- (0.7, -3.1);
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\draw [-latexslim] (0.7, -3.1) -- (0.25, -3.1);
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% Interconnect repeaters controlled by EEM 0
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\draw [latexslim-] (2.4, 3.5) -- (2.9, 3.5);
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\draw [latexslim-] (2.4, 2.3) -- (2.9, 2.3);
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\draw [latexslim-] (2.4, 1.7) -- (2.9, 1.7);
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\draw [latexslim-] (2.4, 0.5) -- (2.9, 0.5);
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\draw [-] (2.9, 3.5) -- (2.9, 0.5);
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\draw [latexslim-] (2.4, 3.3) -- (3.1, 3.3);
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\draw [latexslim-] (2.4, 2.1) -- (3.1, 2.1);
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\draw [latexslim-] (2.4, 1.5) -- (3.1, 1.5);
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\draw [latexslim-] (2.4, 0.3) -- (3.1, 0.3);
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\draw [-] (3.1, 3.3) -- (3.1, 0.3);
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% Interconnect repeaters controlled by EEM 1
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\draw [latexslim-] (2.4, -3.5) -- (2.9, -3.5);
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\draw [latexslim-] (2.4, -2.3) -- (2.9, -2.3);
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\draw [latexslim-] (2.4, -1.7) -- (2.9, -1.7);
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\draw [latexslim-] (2.4, -0.5) -- (2.9, -0.5);
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\draw [-] (2.9, -3.5) -- (2.9, -0.5);
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\draw [latexslim-] (2.4, -3.3) -- (3.1, -3.3);
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\draw [latexslim-] (2.4, -2.1) -- (3.1, -2.1);
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\draw [latexslim-] (2.4, -1.5) -- (3.1, -1.5);
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\draw [latexslim-] (2.4, -0.3) -- (3.1, -0.3);
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\draw [-] (3.1, -3.3) -- (3.1, -0.3);
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% Junction between I/O expander and I/O switches
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\node at (4.6, 1.0)[circle,fill,inner sep=0.7pt]{};
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\draw [-latexslim] (i2c0.south) -- (4.6, 1.0);
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\draw [-latexslim] (ioswitch0.north) -- (4.6, 1.0);
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\draw [-] (4.6, 1.0) -- (3.1, 1.0);
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\node at (4.6, -1.0)[circle,fill,inner sep=0.7pt]{};
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\draw [-latexslim] (i2c1.north) -- (4.6, -1.0);
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\draw [-latexslim] (ioswitch1.south) -- (4.6, -1.0);
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\draw [-] (4.6, -1.0) -- (2.9, -1.0);
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% Connect EEM Ports
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\draw [-latexslim] (2.9, 2.8) -- (6.85, 2.8);
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\draw [latexslim-latexslim] (eeprom0.east) -- (6.85, 2.2);
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\draw [latexslim-latexslim] (i2c0.east) -- (6.85, 1.6);
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\draw [-latexslim] (3.1, -2.8) -- (6.85, -2.8);
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\draw [latexslim-latexslim] (eeprom1.east) -- (6.85, -2.2);
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\draw [latexslim-latexslim] (i2c1.east) -- (6.85, -1.6);
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\end{circuitikz}
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}
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\caption{Simplified Block Diagram}
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\end{figure}
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\begin{figure}[h]
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\centering
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\scalebox{0.88}{
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\begin{circuitikz}[european, scale=0.95, every label/.append style={align=center}]
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% Channel 0 input repeater
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\draw (3, 3.8) node[buffer, circuitikz/bipoles/twoport/width=1.2, scale=0.5] (rep_in0) {};
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% Extra node to raise the upper boundary of the ch7 dotted area
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\draw[color=white, text=black] (3, 5.3) node[twoportshape, circuitikz/bipoles/twoport/width=0.4, scale=0.4 ] (rep_out0_north) {};
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% Left-extend the dotted area to enclose the intersection between input & output
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\draw[color=white, text=black] (2.1, 5.2) node[twoportshape, circuitikz/bipoles/twoport/width=0.4, scale=0.4 ] (rep_out0_west) {};
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% Right-extend the dotted area to enclose intersection & DIR text
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\draw[color=white, text=black] (3.8, 5.2) node[twoportshape, circuitikz/bipoles/twoport/width=0.4, scale=0.4 ] (rep_out0_east) {};
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% Channel 0 output repeater, defined after previous node to coverup white boundaries
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\draw (3, 5.0) node[buffer, circuitikz/bipoles/twoport/width=1.2, scale=-0.5] (rep_out0) {};
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% Channel 0 boundary
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\node[draw, dotted, thick, rounded corners, inner xsep=0.7em, inner ysep=0.4em, fit=(rep_in0)(rep_out0)(rep_out0_north)(rep_out0_west)(rep_out0_east)] (sig0) {};
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\node[fill=white, scale=0.7] at (sig0.north) {CH X Repeaters};
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% Channel 0 direction line
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\draw [latexslim-latexslim] (3, 4.0) -- (3, 4.8);
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\draw [-] (3, 4.4) -- (4.6, 4.4);
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\node [label=center:\tiny{CH X}] at (5.0, 4.5) {};
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\node [label=center:\tiny{Direction}] at (5.0, 4.3) {};
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% Expose & interconnect internal LVDS inputs
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\node at (3.8, 5.0)[circle,fill,inner sep=0.7pt]{};
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\draw [latexslim-] (rep_out0.west) -- (3.8, 5.0);
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\draw [-latexslim] (rep_in0.east) -- (3.8, 3.8) -- (3.8, 5.0);
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\draw [latexslim-latexslim] (3.8, 5.0) -- (4.6, 5.0);
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\node [label=center:\tiny{CH X}] at (5.0, 5.1) {};
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\node [label=center:\tiny{EEM I/O}] at (5.0, 4.9) {};
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% Expose external LVDS I/O
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\node at (2.1, 4.4)[circle,fill,inner sep=0.7pt]{};
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\draw [-latexslim] (rep_out0.east) -- (2.1, 5.0) -- (2.1, 4.4);
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\draw [latexslim-] (rep_in0.west) -- (2.1, 3.8) -- (2.1, 4.4);
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\draw [latexslim-latexslim] (2.1, 4.4) -- (1.3, 4.4);
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\node [label=center:\tiny{CH X}] at (0.9, 4.5) {};
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\node [label=center:\tiny{LVDS I/O}] at (0.9, 4.3) {};
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\end{circuitikz}
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}
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\caption{Detailed diagram for channel repeaters}
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\end{figure}
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\begin{figure}[hbt!]
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\centering
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\includegraphics[width=1.5in]{photo2245.jpg}
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\caption{LVDS-TTL Card photo}
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\end{figure}
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% For wide tables, a single column layout is better. It can be switched
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% page-by-page.
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\onecolumn
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\section{Electrical Specifications}
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Information in this section is based on the datasheet of the repeaters IC (FIN1101K8X\footnote{\label{repeaters}https://www.onsemi.com/pdf/datasheet/fin1101-d.pdf}).
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The Absolute Maximum Ratings are those values beyond which damage to the device may occur.
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Other specifications should be met without exception.
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\begin{table}[h]
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\begin{threeparttable}
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\caption{Absolute Maximum Ratings}
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\begin{tabularx}{\textwidth}{l | c | c c c | c | X}
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\thickhline
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\textbf{Parameter} & \textbf{Symbol} & \textbf{Min.} & \textbf{Typ.} & \textbf{Max.} &
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\textbf{Unit} & \textbf{Conditions} \\
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\hline
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LVDS DC input voltage & $V_{IN}$ & -0.5 & & 4.6 & V \\
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\hline
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LVDS DC output voltage & $V_{OUT}$ & -0.5 & & 4.6 & V \\
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\hline
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Continuous Short Circuit Current & $I_{OSD}$ & & 10 & & mA \\
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\thickhline
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\end{tabularx}
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\end{threeparttable}
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\end{table}
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\begin{table}[h]
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\begin{threeparttable}
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\caption{Recommended Input Voltage}
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\begin{tabularx}{\textwidth}{l | c | c c c | c | X}
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\thickhline
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\textbf{Parameter} & \textbf{Symbol} & \textbf{Min.} & \textbf{Typ.} & \textbf{Max.} &
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\textbf{Unit} & \textbf{Conditions} \\
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\hline
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Magnitude of differential input & $|V_{ID}|$ & 0.1 & & 3.3 & V \\
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\hline
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Common mode input & $V_{IC}$ & $|V_{ID}|/2$ & & $3.3-|V_{ID}|/2$ & V \\
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\thickhline
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\end{tabularx}
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\end{threeparttable}
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\end{table}
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The recommended operating temperature is $-40\degree C \leq T_A \leq 85\degree C$.
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All specifications are in the recommended operating temperature range unless otherwise noted.
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All typical values of DC specifications are at $T_A = 25\degree C$.
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\begin{table}[h]
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\begin{threeparttable}
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\caption{DC Specifications}
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\begin{tabularx}{\textwidth}{l | c | c c c | c | X}
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\thickhline
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\textbf{Parameter} & \textbf{Symbol} & \textbf{Min.} & \textbf{Typ.} & \textbf{Max.} &
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\textbf{Unit} & \textbf{Conditions} \\
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\hline
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Differential input threshold HIGH & $V_{TH}$ & & & 100 & mV & \\
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\hline
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Differential input threshold LOW & $V_{TL}$ & -100 & & & mV & \\
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\hline
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Output differentiual Voltage & $V_{OD}$ & 250 & 330 & 450 & mV & \multirow{4}{*}{With 100$\Omega$ load.} \\
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\cline{0-5}
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$|V_{OD}|$ change (LOW-to-HIGH) & $\Delta V_{OD}$ & & & 25 & mV & \\
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\cline{0-5}
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Offset voltage & $V_{OS}$ & 1.125 & 1.23 & 1.375 & V & \\
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\cline{0-5}
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$|V_{OS}|$ change (LOW-to-HIGH) & $\Delta V_{OS}$ & & & 25 & mV & \\
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\hline
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Short circuit output current & $I_{OS}$ & & $\pm3.4$ & $\pm6$ & mA & \\
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\hline
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Input current & $I_{IN}$ & & & $\pm20$ & \textmu A & Recommended Input Voltage \\
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\thickhline
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\end{tabularx}
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\end{threeparttable}
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\end{table}
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\newpage
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All typical values of AC specifications are at $T_A = 25\degree C$, $V_{ID} = 300mV$, $V_{IC} = 1.3V$ unless otherwise specified.
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\begin{table}[h]
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\begin{threeparttable}
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\caption{AC Specifications}
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\begin{tabularx}{\textwidth}{l | c | c c c | c | X}
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\thickhline
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\textbf{Parameter} & \textbf{Symbol} & \textbf{Min.} & \textbf{Typ.} & \textbf{Max.} &
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\textbf{Unit} & \textbf{Conditions} \\
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\hline
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Differential Output Rise Time & \multirow{2}{*}{$t_{TLHD}$} & \multirow{2}{*}{0.29} & \multirow{2}{*}{0.40} & \multirow{2}{*}{0.58} & \multirow{2}{*}{ns} & duty Cycle = 50\%.\\
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(20\% to 80\%) & & & & & & \\
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\cline{0-5}
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Differential Output Fall Time & \multirow{2}{*}{$t_{THLD}$} & \multirow{2}{*}{0.29} & \multirow{2}{*}{0.40} & \multirow{2}{*}{0.58} & \multirow{2}{*}{ns} & \\
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(80\% to 20\%) & & & & & & \\
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\cline{0-5}
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Pulse width distortion & $PWD$ & & 0.01 & 0.2 & ns & \\
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\hline
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LVDS data jitter, & \multirow{2}{*}{$t_{DJ}$} & & \multirow{2}{*}{85} & \multirow{2}{*}{125} & \multirow{2}{*}{ps} & $PRBS=2^{23}-1$\\
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deterministic & & & & & & 800 Mbps\\
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\hline
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LVDS clock jitter, & \multirow{2}{*}{$t_{RJ}$} & & \multirow{2}{*}{2.1} & \multirow{2}{*}{3.5} & \multirow{2}{*}{ps} & \multirow{2}{*}{400 MHz clock}\\
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random (RMS) & & & & & & \\
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\thickhline
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\end{tabularx}
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\end{threeparttable}
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\end{table}
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\section{Configuring IO Direction \& Termination}
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The IO direction can be configured by switches, which are found at the top of the card.
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\begin{multicols}{2}
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IO direction switches partly decides the IO direction of each bank.
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\begin{itemize}
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\itemsep0em
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\item Closed switch (ON) \\
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Fix the corresponding channel to output. The direction cannot be changed by I\textsuperscript{2}C.
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\item Opened switch (OFF) \\
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Leave the direction configurable by I\textsuperscript{2}C.
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\end{itemize}
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\columnbreak
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\begin{center}
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\centering
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\includegraphics[height=1.5in]{lvds_ttl_switches.jpg}
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\captionof{figure}{Position of switches}
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\end{center}
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\end{multicols}
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\newpage
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\section{Example ARTIQ code}
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The sections below demonstrate simple usage scenarios of the 2245 LVDS-TTL card with the ARTIQ control system.
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They do not exhaustively demonstrate all the features of the ARTIQ system.
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The full documentation for the ARTIQ software and gateware is available at \url{https://m-labs.hk}.
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Timing accuracy in the examples below is well under 1 nanosecond thanks to the ARTIQ RTIO system.
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\subsection{One pulse per second}
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The channel should be configured as output in both the gateware and hardware.
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\begin{minted}{python}
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@kernel
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def run(self):
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self.core.reset()
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while True:
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self.ttl0.pulse(500*ms)
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delay(500*ms)
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\end{minted}
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\subsection{Morse code}
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This example demonstrates some basic algorithmic features of the ARTIQ-Python language.
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\begin{minted}{python}
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def prepare(self):
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# As of ARTIQ-6, the ARTIQ compiler has limited string handling
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# capabilities, so we pass a list of integers instead.
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message = ".- .-. - .. --.-"
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self.commands = [{".": 1, "-": 2, " ": 3}[c] for c in message]
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@kernel
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def run(self):
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self.core.reset()
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for cmd in self.commands:
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if cmd == 1:
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self.led.pulse(100*ms)
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delay(100*ms)
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if cmd == 2:
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self.led.pulse(300*ms)
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delay(100*ms)
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if cmd == 3:
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delay(700*ms)
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\end{minted}
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\newpage
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\subsection{Counting rising edges in a 1ms window}
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The channel should be configured as input in both the gateware and hardware.
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\begin{minted}{python}
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@kernel
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def run(self):
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self.core.reset()
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gate_end_mu = self.ttl0.gate_rising(1*ms)
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counts = self.ttl0.count()
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print(counts)
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\end{minted}
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This example code uses the software counter, which has a maximum count rate of approximately 1 million events per second.
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If the gateware counter is enabled on the TTL channel, it can typically count up to 125 million events per second:
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\begin{minted}{python}
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@kernel
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def run(self):
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self.core.reset()
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self.edgecounter0.gate_rising(1*ms)
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counts = self.edgecounter0.fetch_count()
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print(counts)
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\end{minted}
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\subsection{Responding to an external trigger}
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One channel needs to be configured as input, and the other as output.
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\begin{minted}{python}
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@kernel
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def run(self):
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self.core.reset()
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self.ttlin.gate_rising(5*ms)
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timestamp_mu = self.ttlin.timestamp_mu()
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at_mu(timestamp_mu + self.core.seconds_to_mu(10*ms))
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self.ttlout.pulse(1*us)
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\end{minted}
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\section{Ordering Information}
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To order, please visit \url{https://m-labs.hk} and select the 2245 LVDS-TTL in the ARTIQ Sinara crate configuration tool. The card may also be ordered separately by writing to \url{mailto:sales@m-labs.hk}.
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\section*{}
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\vspace*{\fill}
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\begin{footnotesize}
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Information furnished by M-Labs Limited is provided in good faith in the hope that it will be useful. However, no responsibility is assumed by M-Labs Limited for its use. Specifications may be subject to change without notice.
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\end{footnotesize}
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\end{document}
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