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Query regarding Eq's of Master State Machine

Hello ,

We want few clarifications from the Master State machine Equations given
in the APPENDIX B of PCI SPEC 2.1 / 2.2.

First one is 
----  --- --
IRDY# = ![M_DATA * (Ready + Dev_to)]

Here what is the need of Dev_to .

Can the Eq be IRDY# = ![M_DATA * Ready]

Second One
------ ---

Target_abort = (!STOP# * DEVSEL# * M_DATA * FRAME# * !IRDY#)

Can the Eq be 

   Target_abort = (!STOP# * DEVSEL# * M_DATA * TRDY )


Thx well in Advance
S.M.RAO