sim added

git-svn-id: http://opencores.org/ocsvn/eco32/eco32/trunk/sim@8 133310ea-c0b2-4f2d-ae91-eb8ea07367b3
Makefiles updated

git-svn-id: http://opencores.org/ocsvn/eco32/eco32/trunk/sim@24 133310ea-c0b2-4f2d-ae91-eb8ea07367b3
new timing model, second timer, shutdown device

git-svn-id: http://opencores.org/ocsvn/eco32/eco32/trunk/sim@25 133310ea-c0b2-4f2d-ae91-eb8ea07367b3