Section 13 PCI Controller (PCIC)
Rev.1.00 Dec. 13, 2005 Page 539 of 1286
REJ09B0158-0100
(7) Cache
Coherency
The PCIC supports cache snoop function.
When the PCIC functions as a target device, cache coherency is guaranteed for accesses from a
master device connected to a PCI bus in both the host bus bridge mode and normal mode.
When accessing this LSI cacheable area, set the cache snoop registers: the PCI cache snoop
control registers (PCICSCR0 and PCICSCR1) and PCI cache snoop address register (PCICSAR0
and PCICSAR1).
Usage Notes
•
Up to 2 conditions can be set as snoop address. Address comparison is logical OR of setting 2
conditions.
•
When using this function, execute memory read or write after flush/purge request issued to the
CPU cache in the access of cache hit. It reduces PCI bus transfer speed and CPU performance.
•
When using this function, do not use the prefetch function.
(Do not set PFE bit in the PCICR to 1.)
•
Do not use this function when the CPU is sleep state. If cache hit occurs in sleep state, it
becomes an error access on the SuperHyway bus, and memory read or memory write does not
execute. Specify the SNPMD bit in the PCICSCR to 00 before the CPU enters sleep mode. To
keep the coherency before and after the CPU sleep, cache purge should be executed before
sleep instruction executed.
•
Do not use ether of the following functions and the cache shoop function simultaneously.
Debug function using an emulator (Disable this function when using an emulator).
L memory or memory mapped cache access from the DMAC.
Summary of Contents for SH7780 Series
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Page 82: ...Section 1 Overview Rev 1 00 Dec 13 2005 Page 32 of 1286 REJ09B0158 0100 ...
Page 122: ...Section 3 Instruction Set Rev 1 00 Dec 13 2005 Page 72 of 1286 REJ09B0158 0100 ...
Page 146: ...Section 4 Pipelining Rev 1 00 Dec 13 2005 Page 96 of 1286 REJ09B0158 0100 ...
Page 196: ...Section 6 Floating Point Unit FPU Rev 1 00 Dec 13 2005 Page 146 of 1286 REJ09B0158 0100 ...
Page 292: ...Section 9 L Memory Rev 1 00 Dec 13 2005 Page 242 of 1286 REJ09B0158 0100 ...
Page 492: ...Section 12 DDR SDRAM Interface DDRIF Rev 1 00 Dec 13 2005 Page 442 of 1286 REJ09B0158 0100 ...
Page 674: ...Section 15 Clock Pulse Generator CPG Rev 1 00 Dec 13 2005 Page 624 of 1286 REJ09B0158 0100 ...
Page 692: ...Section 16 Watchdog Timer and Reset Rev 1 00 Dec 13 2005 Page 642 of 1286 REJ09B0158 0100 ...
Page 726: ...Section 18 Timer Unit TMU Rev 1 00 Dec 13 2005 Page 676 of 1286 REJ09B0158 0100 ...
Page 1032: ...Section 25 Audio Codec Interface HAC Rev 1 00 Dec 13 2005 Page 982 of 1286 REJ09B0158 0100 ...
Page 1150: ...Section 28 General Purpose I O GPIO Rev 1 00 Dec 13 2005 Page 1100 of 1286 REJ09B0158 0100 ...
Page 1184: ...Section 29 User Break Controller UBC Rev 1 00 Dec 13 2005 Page 1134 of 1286 REJ09B0158 0100 ...
Page 1266: ...Section 31 Electrical Characteristics Rev 1 00 Dec 13 2005 Page 1216 of 1286 REJ09B0158 0100 ...
Page 1328: ...Appendix Rev 1 00 Dec 13 2005 Page 1278 of 1286 REJ09B0158 0100 ...
Page 1336: ...Rev 1 00 Dec 13 2005 Page 1286 of 1286 REJ09B0158 0100 ...
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