Section 7 Memory Management Unit (MMU)
Rev.1.00 Dec. 13, 2005 Page 191 of 1286
REJ09B0158-0100
With a 512-Mbyte page, PPN[31:29] are valid.
•
C: Cacheability bit
Indicates whether a page is cacheable.
0: Not cacheable
1: Cacheable
•
WT: Write-through bit
Specifies the cache write mode.
0: Copy-back mode
1: Write-through mode
•
UB: Buffered write bit
Specifies whether a buffered write is performed.
0: Buffered write (Data access of subsequent processing proceeds without waiting for the write
to complete.)
1: Unbuffered write (Data access of subsequent processing is stalled until the write has
completed.)
7.7.4 PMB
Function
This LSI supports the following PMB functions.
1. Only memory-mapped write can be used for writing to the PMB. The LDTLB instruction
cannot be used to write to the PMB.
2. Software must ensure that every accessed P1 or P2 address has a corresponding PMB entry
before the access occurs. When an access to an address in the P1 or P2 area which is not
recorded in the PMB is made, this LSI is reset by the TLB. In this case, the accessed address in
the P1 or P2 area which causes the TLB reset is stored in the TEA and code H
′
140 in the
EXPEVT.
3. This LSI does not guarantee the operation when multiple hit occurs in the PMB. Special care
should be taken when the PMB mapping information is recorded by software.
4. The PMB does not have an associative write function.
5. Since there is no PR field in the PMB, read/write protection cannot be preformed. The address
translation target of the PMB is the P1 or P2 address. In user mode access, an address error
exception occurs.
6. Both entries from the UTLB and PMB are mixed and recorded in the ITLB by means of the
hardware ITLB miss handling. However, these entries can be identified by checking whether
Содержание SH7780 Series
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