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         id="tspan1240">what's going on in</tspan><tspan
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         id="tspan1242">the design.</tspan></text>
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         style="font-style:normal;font-variant:normal;font-weight:normal;font-stretch:normal;font-family:'Liberation Sans';-inkscape-font-specification:'Liberation Sans'">The code in otbn_core_model.sv is designed to be</tspan><tspan
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         style="font-style:normal;font-variant:normal;font-weight:normal;font-stretch:normal;font-family:'Liberation Sans';-inkscape-font-specification:'Liberation Sans'">as minimal as possible, just tracking clock edges</tspan><tspan
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         style="font-style:normal;font-variant:normal;font-weight:normal;font-stretch:normal;font-family:'Liberation Sans';-inkscape-font-specification:'Liberation Sans'">and resets and passing all the work over DPI to the</tspan><tspan
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         id="tspan176">model itself.</tspan></text>
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       style="color:#000000;font-style:normal;font-variant:normal;font-weight:normal;font-stretch:normal;font-size:16px;line-height:21.4286px;font-family:'Liberation Mono';-inkscape-font-specification:'Liberation Mono';font-variant-ligatures:normal;font-variant-position:normal;font-variant-caps:normal;font-variant-numeric:normal;font-variant-alternates:normal;font-variant-east-asian:normal;font-feature-settings:normal;font-variation-settings:normal;text-indent:0;text-align:start;text-decoration:none;text-decoration-line:none;text-decoration-style:solid;text-decoration-color:#000000;letter-spacing:0px;word-spacing:0px;text-transform:none;writing-mode:lr-tb;direction:ltr;text-orientation:mixed;dominant-baseline:auto;baseline-shift:baseline;text-anchor:start;white-space:normal;shape-padding:0;shape-margin:0;inline-size:0;overflow:visible;opacity:1;vector-effect:none;fill:#000000;fill-opacity:1;fill-rule:evenodd;stroke:none;stroke-width:0.999999;stroke-linecap:butt;stroke-linejoin:miter;stroke-miterlimit:4;stroke-dasharray:none;stroke-dashoffset:0;stroke-opacity:1;marker-end:url(#Arrow1Mend);stop-color:#000000;stop-opacity:1"
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         id="tspan2122">otbn_model.cc translates from DPI calls to a more</tspan><tspan
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         style="font-style:normal;font-variant:normal;font-weight:normal;font-stretch:normal;font-family:'Liberation Sans';-inkscape-font-specification:'Liberation Sans'"
         id="tspan2126">object-orientated framework. It does a small amount</tspan><tspan
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         id="tspan2130">of &quot;lifetime modelling&quot;, handling how we check things</tspan><tspan
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         style="font-style:normal;font-variant:normal;font-weight:normal;font-stretch:normal;font-family:'Liberation Sans';-inkscape-font-specification:'Liberation Sans'"
         id="tspan2132">at start/end of operation. It is also in charge of</tspan><tspan
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         style="font-style:normal;font-variant:normal;font-weight:normal;font-stretch:normal;font-family:'Liberation Sans';-inkscape-font-specification:'Liberation Sans'"
         id="tspan2134">translation between C++ types and SV DPI types.</tspan></text>
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       style="color:#000000;font-style:normal;font-variant:normal;font-weight:normal;font-stretch:normal;font-size:16px;line-height:21.4286px;font-family:'Liberation Mono';-inkscape-font-specification:'Liberation Mono';font-variant-ligatures:normal;font-variant-position:normal;font-variant-caps:normal;font-variant-numeric:normal;font-variant-alternates:normal;font-variant-east-asian:normal;font-feature-settings:normal;font-variation-settings:normal;text-indent:0;text-align:start;text-decoration:none;text-decoration-line:none;text-decoration-style:solid;text-decoration-color:#000000;letter-spacing:0px;word-spacing:0px;text-transform:none;writing-mode:lr-tb;direction:ltr;text-orientation:mixed;dominant-baseline:auto;baseline-shift:baseline;text-anchor:start;white-space:normal;shape-padding:0;shape-margin:0;inline-size:0;overflow:visible;opacity:1;vector-effect:none;fill:#000000;fill-opacity:1;fill-rule:evenodd;stroke:none;stroke-width:0.999999;stroke-linecap:butt;stroke-linejoin:miter;stroke-miterlimit:4;stroke-dasharray:none;stroke-dashoffset:0;stroke-opacity:1;marker-end:url(#Arrow1Mend);stop-color:#000000;stop-opacity:1"
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         style="font-style:normal;font-variant:normal;font-weight:normal;font-stretch:normal;font-family:'Liberation Sans';-inkscape-font-specification:'Liberation Sans'"
         id="tspan2148">The ISSWrapper class in iss_wrapper.h and</tspan><tspan
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         id="tspan2181">iss_wrapper.cc doesn't know much about OTBN.</tspan><tspan
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         style="font-style:normal;font-variant:normal;font-weight:normal;font-stretch:normal;font-family:'Liberation Sans';-inkscape-font-specification:'Liberation Sans'"
         id="tspan2185">Instead, it's in charge of managing the ISS process</tspan><tspan
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         style="font-style:normal;font-variant:normal;font-weight:normal;font-stretch:normal;font-family:'Liberation Sans';-inkscape-font-specification:'Liberation Sans'"
         id="tspan2187">and communication with that subprocess over</tspan><tspan
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         id="tspan2191">pipes.</tspan></text>
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         id="tspan2203">stepped.py is a script front-end for running the</tspan><tspan
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         id="tspan2221">ISS (similar to standalone.py, which is more</tspan><tspan
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         id="tspan2223">convenient on the command line). It implements a</tspan><tspan
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         id="tspan2225">simple REPL, converting text-mode commands from</tspan><tspan
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         style="font-style:normal;font-variant:normal;font-weight:normal;font-stretch:normal;font-family:'Liberation Sans';-inkscape-font-specification:'Liberation Sans'"
         id="tspan2227">stdin to Python calls and serializing results back to</tspan><tspan
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         id="tspan2229">text on stdout.</tspan></text>
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       style="color:#000000;font-style:normal;font-variant:normal;font-weight:normal;font-stretch:normal;font-size:16px;line-height:21.4286px;font-family:'Liberation Mono';-inkscape-font-specification:'Liberation Mono';font-variant-ligatures:normal;font-variant-position:normal;font-variant-caps:normal;font-variant-numeric:normal;font-variant-alternates:normal;font-variant-east-asian:normal;font-feature-settings:normal;font-variation-settings:normal;text-indent:0;text-align:start;text-decoration:none;text-decoration-line:none;text-decoration-style:solid;text-decoration-color:#000000;letter-spacing:0px;word-spacing:0px;text-transform:none;writing-mode:lr-tb;direction:ltr;text-orientation:mixed;dominant-baseline:auto;baseline-shift:baseline;text-anchor:start;white-space:normal;shape-padding:0;shape-margin:0;inline-size:0;overflow:visible;opacity:1;vector-effect:none;fill:#000000;fill-opacity:1;fill-rule:evenodd;stroke:none;stroke-width:0.999999;stroke-linecap:butt;stroke-linejoin:miter;stroke-miterlimit:4;stroke-dasharray:none;stroke-dashoffset:0;stroke-opacity:1;marker-end:url(#Arrow1Mend);stop-color:#000000;stop-opacity:1"
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         id="tspan2241">Together with the other Python files in the sim/</tspan><tspan
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         id="tspan2265">directory, sim.py forms the core of the instruction</tspan><tspan
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         id="tspan2267">set simulator, which is the golden reference model</tspan><tspan
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         id="tspan2269">for OTBN.</tspan></text>
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         style="font-size:26.6667px">DPI</tspan></text>
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