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.
Содержание SH7780 Series
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