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+%%  ************    LibreSilicon's 1st TestWafer    *******************
+%%
+%%  Organisation:   Chipforge
+%%                  Germany / European Union
+%%
+%%  Profile:        Chipforge focus on fine System-on-Chip Cores in
+%%                  Verilog HDL Code which are easy understandable and
+%%                  adjustable. For further information see
+%%                          www.chipforge.org
+%%                  there are projects from small cores up to PCBs, too.
+%%
+%%  File:           PearlRiver/Documents/LaTeX/die_quarter.tex
+%%
+%%  Purpose:        Principle Description Pictgure for quarters
+%%
+%%  ************    LaTeX with circdia.sty package      ***************
+%%
+%%  ///////////////////////////////////////////////////////////////////
+%%
+%%  Copyright (c) 2018 by chipforge <hsank@nospam.chipforge.org>
+%%  All rights reserved.
+%%
+%%      This Standard Cell Library is licensed under the Libre Silicon
+%%      public license; you can redistribute it and/or modify it under
+%%      the terms of the Libre Silicon public license as published by
+%%      the Libre Silicon alliance, either version 1 of the License, or
+%%      (at your option) any later version.
+%%
+%%      This design is distributed in the hope that it will be useful,
+%%      but WITHOUT ANY WARRANTY; without even the implied warranty of
+%%      MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
+%%      See the Libre Silicon Public License for more details.
+%%
+%%  ///////////////////////////////////////////////////////////////////
+\begin{center}
+    Principle - $R_\square$
+    \begin{figure}[h]
+        \begin{center}
+            \begin{tikzpicture}[]
+            % front
+            \draw (0,0) -- (4,0) -- (4,1) -- (0,1) -- cycle;
+            % 1st top
+            \draw (0,1) -- (2,3) -- (6,3) -- (4,1) -- cycle;
+            % 1st boarder
+            \draw (4,0) -- (4,1) -- (6,3) -- (6,2) -- cycle;
+            % 2nd top
+            \draw (2,3) -- (4,5) -- (8,5) -- (6,3) -- cycle;
+            % 2nd boarder
+            \draw (6,3) -- (8,5) -- (8,4) -- (6,2) -- cycle;
+            \end{tikzpicture}
+        \end{center}
+    \end{figure}
+\end{center}