extension: jetzt gibts des file auch :D

diff --git a/2_isa/extension.tex b/2_isa/extension.tex
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+Each extension modul consits of 4 words in the memory space. The first word (word with the highest address) is splitted in 4 parts (bytewise).\\
+The first byte (beginning from the lsb) is the global status byte. \\
+The second byte is the custom status byte. \\
+The third is the global control byte. \\
+The last is the custom control byte. \\
+The other 3 words have functionality dependent on the extension modul. They can be readable/writeable. In some cases reading from one word will read a different register as the register that is written.
+
+remark: maybe more words will be combined for one extension modul if necassery. Maybe 2 extension blocks are used for the same extension modul.got