Not analyzed yet completly. This analyse can certainly be wrong : wip.
Gives instruction instructions lengh : MCycles, TStates (please remark the 's' at end of theses words...), in [[http://www.zilog.com/docs/z80/um0080.pdf|Z80 doc]] each instruction is timing described using "M Cycles" and "T States" vocabulary.
It's a "controler", does gives orders to T80_ALU.vhdl throw T80.vhdl