mcf5407 Freescale Semiconductor, Inc, mcf5407 Datasheet - Page 154
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mcf5407
Manufacturer Part Number
mcf5407
Description
Mcf5407 Coldfire Integrated Microprocessor User
Manufacturer
Freescale Semiconductor, Inc
Datasheet
1.MCF5407.pdf
(546 pages)
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Cache Operation Summary
Write hit
(write-
through)
Cache
invalidate
Cache
push
The following tables present the same information as Table 4-7, organized by the current
state of the cache line. In Table 4-8 the current state is invalid.
In Table 4-9 the current state is valid.
4-30
Access
Table 4-8. Data Cache Line State Transitions (Current State Invalid)
WI4
(C,W)I5 No action;
(C,W)I6
(C,W)I7
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. Data Cache Line State Transitions (Continued)
Invalid (V = 0)
Not possible.
stay in invalid state.
No action;
stay in invalid state.
Access
WV4
(C,W)V5 No action;
(C,W)V6 No action;
(C,W)V7 No action;
(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;
MCF5407 User’s Manual
Valid (V = 1, M = 0)
supply data to processor;
go to valid state.
Read line from memory and update cache;
write data to cache;
go to modified state.
Write data to memory;
stay in invalid state.
Not possible
Not possible
stay in invalid state.
stay in invalid state.
stay in invalid state.
Write data to memory and
to cache;
stay in valid state.
go to invalid state.
go to invalid state.
stay in valid state.
Current State
Response
WD4 Write data to memory and
CD5 No action (modified data
CD6 Push modified line to
CD7 Push modified line to
Modified (V = 1, M = 1)
to cache;
go to valid state.
Cache mode changed for
the region corresponding to
this line. To avoid this state,
execute a CPUSHL
instruction or set
CACR[DCINVA,ICINVA]
before switching modes.
lost);
go to invalid state.
memory;
go to invalid state.
memory;
go to valid state.
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