CPU Read hit

Invalidate

Shared (read/only)

Invalid

CPU Read

Send Read Miss message

CPU read miss: Send Read Miss

CPU Write: Send Write Miss msg to h.d.

CPU Write:Send Write Miss message to home directory

Fetch/Invalidate send Data Write Back message to home directory

CPU read miss: send Data Write Back message and read miss to home directory

Exclusive (read/writ)

CPU read hit CPU write hit

CPU write miss: send Data Write Back message and Write Miss to home directory