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["Liangliang Tong" <nutspea@xxxxxxxxxx>]

Hello everyone, when I am verifying one of my idea using gems, there are several
questions I fail to figure out:

1) In the MESI_CMP_directory protocol, there is a status called "idle", whereas
the traditional status is "invalidate", so I wonder is there any differences
between these two statuses? if different, how?

2)  IS, desc="L1 idle, issued GETS, have not seen response yet";
    IM, desc="L1 idle, issued GETX, have not seen response yet";
    SM, desc="L1 idle, issued GETX, have not seen response yet";
    IS_I, desc="L1 idle, issued GETS, saw Inv before data because directory
doesn't block on GETS hit";

    M_I, desc="L1 replacing, waiting for ACK";
    E_I, desc="L1 replacing, waiting for ACK";

I just can not understand the explainations in the " ", they are the same for IM
and SM, or M_I and E_I? could anyone explain these four transient statuses  to
me?

Thanks a lot!
Liangliang Tong