Fix idd4w*
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@@ -1226,7 +1226,7 @@ Interface -> comparison with SPICE, maybe use a random pattern in spice with fix
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Core -> we do not yet have a measurement platform for DDR5/LPDDR5/HBM3... where we can issue specific command patterns to DRAM and compare it with the results provided by DRAMPower.
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\todo{Marco, Derek}
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% IDD Patterns mit Daimler Messung vergleichen
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In order to verify the power estimates of the new DRAMPower implementation, several measurements are performed on DRAMs from three different vendors based on a real LPDDR4 memory measurement platform~\cite{feldmann_23}.
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To verify the power estimates of the new DRAMPower implementation, we use measurement data from DRAMs of three different vendors, as reported in a real LPDDR4 memory measurement platform study~\cite{feldmann_23}.
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Each DRAM is operated with six different access patterns, which are analogous to the following $I_{DD}$ currents:
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\tikz{\node[circle,draw,inner sep=1pt] {\tiny 1}}~$I_{DD}0$*,
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\tikz{\node[circle,draw,inner sep=1pt] {\tiny 2}}~$I_{DD}4R$,
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@@ -1235,17 +1235,18 @@ Each DRAM is operated with six different access patterns, which are analogous to
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\tikz{\node[circle,draw,inner sep=1pt] {\tiny 5}}~$I_{DD}2N$ and
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\tikz{\node[circle,draw,inner sep=1pt] {\tiny 6}}~$I_{DD}6$.
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As it was not possible to reproduce the usual $I_{DD}0$ pattern of ACT-PRE for the measurement platform, $I_{DD}0$* is a variation using the pattern ACT-RD-PRE, which is also resembled in the DRAMPower simulation.
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Also, the measurement platform was not able to accurately measure the write current $I_{DD}4W$
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The initial simulations are based on the current values specified in the datasheet of the specific vendor.
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Then, based on the actual measurements, the current values are reapplied to a second simulation.
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The results are shown in Figure~\ref{fig:power_plot}.
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% \begin{figure}
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% \centering
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% \resizebox{\linewidth}{!}{%
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% \input{img/power_plot}
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% }
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% \caption{Average Power Consumption of Simulations and Measurements for Different Vendors}
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% \label{fig:power_plot}
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% \end{figure}
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\begin{figure}
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\centering
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\resizebox{\linewidth}{!}{%
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\input{img/power_plot}
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}
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\caption{Average Power Consumption of Simulations and Measurements for Different Vendors}
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\label{fig:power_plot}
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\end{figure}
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As it can be seen, the $I_{DD}$ currents in the datasheet are overly pessimistic for all vendors:
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The simulations based on the datasheets show on average a $4.8\times$ higher power consumption than the actual power measurements.
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However, when the measured currents are applied to the simulation, there is still a small discrepancy:
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