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coa中的MESI图表


Write hit The states in begin Initial E I snoopy Where is the Valid data? The cache in Exclusive state and MM. The cache in shared state and MM The states in end Initial M snoopy I

>Actions The initial just updates the word, and transitions to modified state.

S

S

The initial signals its exclusive ownership of the cache line on the bus, the snoopy in shared state transitions to invalid state. The initial updates the word and transitions to modified state , The initial updates the word and still in modified state.

M

I

M

I

Only the cache in modified state

M

I

Read miss The states in begin Initial I snoopy E Where is the Valid data? The cache in E state and main memory The cache in S state and main memory The cache in M state The states in end Initial The initial read line from main memory or the cache in E state, and transitions from I to S, the snoopy transitions from E to S. The initial read line from main memory or the cache in S state, and transitions from I to S, the snoopy still in S. The cache in M state blocks the memory read and provides the line to the requesting cache and main memory over the shared bus and changes its state to S. The initial changes from I to S. The initial read the line from main memory and transitions from I to E. S snoopy S

Actions

I

S

S

S

I

M

S

S

I

I

Main memory

E

I

Write miss The states in begin Initial I snoopy M Where is the Valid data? The cache in M Actions The initial issues a signal on the bus that means read-with –intend-to-modify. The snoopy in M gains access to the bus and writes the modified cache line back to main memory and transitions to I. The initial reads the line from main memory and update the word , transitions to M. The initial reads the line from maim memory or the line in E and modify it , the initial transitions from I to M ,the snoopy in E changes to I. The initial reads the line from maim memory or the line in S and modify it , the initial transitions from I to M ,the snoopy in S changes to I. The initial reads the line from main memory and modify it, transitions from I to M. The states in end Initial M snoopy I

I

E

The cache in E and main memory

M

I

I

S

The cache in S and main memory

M

I

I

I

Main memory

M

I

Read hit The states in begin Initial E I snoopy Where is the Valid data? The cache in Exclusive state and MM. The cache in shared state and MM The states in end Initial E snoopy I

Actions The initial simply reads the required item and there is no state change: the state remains modified, shard and exclusive.

S

S

S

S

M

I

Only the cache in modified state

M

I


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