mcf5307cft90b Freescale Semiconductor, Inc, mcf5307cft90b Datasheet - Page 126

• Manufacturer Part Number: mcf5307cft90b
• Description: Mcf5307 Coldfire Integrated Microprocessor User
• Manufacturer: Freescale Semiconductor, Inc

Cache Operation Summary
The following tables present the same information as Table 4-6, organized by the current
state of the cache line. In Table 4-7 the current state is invalid.
In Table 4-8 the current state is valid.
4-28
Read miss
Read hit
Write miss (copyback)
Write miss (write-through)
Write hit (copyback)
Write hit (write-through)
Cache invalidate
Cache push
Cache push
Table 4-7. Cache Line State Transitions (Current State Invalid)
Read miss
Read hit
Write miss (copyback)
Write miss (write-through)
Write hit (copyback)
Write hit (write-through)
Cache invalidate
Cache push
Cache push
Table 4-8. Cache Line State Transitions (Current State Valid)
Access
Access
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(C,W)V1 Read new line from memory and update cache;
(C,W)V2 Supply data to processor;
CV3
WV3
CV4
WV4
(C,W)V5 No action;
(C,W)V6 No action;
(C,W)V7 No action;
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(C,W)I1 Read line from memory and update cache;
(C,W)I2 Not possible
CI3
WI3
CI4
WI4
(C,W)I5 No action;
(C,W)I6 No action;
(C,W)I7 No action;
MCF5307 User’s Manual
supply data to processor; stay in valid state.
stay in valid state.
Read new line from memory and update cache;
write data to cache;
go to modified state.
Write data to memory;
stay in valid state.
Write data to cache;
go to modified state.
Write data to memory and to cache;
stay in valid state.
go to invalid state.
go to invalid state.
stay in valid state.
supply data to processor;
go to valid state.
write data to cache;
go to modified state.
stay in invalid state.
stay in invalid state.
stay in invalid state.
stay in invalid state.
Read line from memory and update cache;
Write data to memory;
Not possible
Not possible
Response
Response