Section 8 Cache
Rev. 2.00 Mar 09, 2006 page 360 of 906
REJ09B0292-0200
Bit 1—Instruction Replacement Disable Bit (ID): ID is the bit for disabling instruction
replacement. When this bit is 1, an instruction fetched from external memory is not written to the
cache even if there is a cache miss. Cache data is, however, read or updated during cache hits. ID
is valid only when CE is 1.
Bit 1: ID
Description
0
Normal operation
(Initial value)
1
Data not replaced even when cache miss occurs in instruction fetch
Bit 0—Cache Enable Bit (CE): CE is the cache enable bit. Cache can be used when CE is set to 1.
Bit 0: CE
Description
0
Cache disabled
(Initial value)
1
Cache enabled
8.3
Address Space and the Cache
The address space is divided into six partitions. The cache access operation is specified by
addresses. Table 8.2 lists the partitions and their cache operations. For more information on
address spaces, see section 7, Bus State Controller. Note that the spaces of the cache area and
cache-through area are the same.
Table 8.2
Address Space and Cache Operation
Addresses
A31–A29
Partition
Cache Operation
000
Cache area
Cache is used when the CE bit in CCR is 1
001
Cache-through area
Cache is not used
010
Associative purge area
Cache line of the specified address is purged
(disabled)
011
Address array read/write area
Cache address array is accessed directly
110
Data array read/write area
Cache data array is accessed directly
111
I/O area
Cache is not used
Summary of Contents for SH7616
Page 10: ...Rev 2 00 Mar 09 2006 page x of xxvi ...
Page 132: ...Section 2 CPU Rev 2 00 Mar 09 2006 page 106 of 906 REJ09B0292 0200 ...
Page 568: ...Section 12 16 Bit Free Running Timer FRT Rev 2 00 Mar 09 2006 page 542 of 906 REJ09B0292 0200 ...
Page 582: ...Section 13 Watchdog Timer WDT Rev 2 00 Mar 09 2006 page 556 of 906 REJ09B0292 0200 ...
Page 706: ...Section 16 Serial I O SIO Rev 2 00 Mar 09 2006 page 680 of 906 REJ09B0292 0200 ...
Page 820: ...Section 19 Pin Function Controller PFC Rev 2 00 Mar 09 2006 page 794 of 906 REJ09B0292 0200 ...
Page 932: ...Appendix D Package Dimensions Rev 2 00 Mar 09 2006 page 906 of 906 REJ09B0292 0200 ...
Page 935: ...SH7616 Hardware Manual ...