From: Manfred Date: Wed, 1 Dec 2010 10:09:16 +0000 (+0100) Subject: extension: jetzt gibts des file auch :D X-Git-Tag: bootrom_v1~106 X-Git-Url: http://wien.tomnetworks.com/gitweb/?p=calu.git;a=commitdiff_plain;h=9d97e7af92a104026cabcfd4ba41551af98a2114 extension: jetzt gibts des file auch :D --- diff --git a/2_isa/extension.tex b/2_isa/extension.tex new file mode 100644 index 0000000..366d504 --- /dev/null +++ b/2_isa/extension.tex @@ -0,0 +1,8 @@ +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