SH7763 Datasheet, PDF (251/2026 Pages) Renesas Technology Corp – Renesas 32-Bit RISC Microcomputer SuperHTM RISC Engine Family SH-4A Series

Section 6 Memory Management Unit (MMU)
• UB: Buffered write bit
Specifies whether a buffered write is performed.
0: Buffered write (Subsequent processing proceeds without waiting for the write to complete.)
1: Unbuffered write (Subsequent processing is stalled until the write has completed.)
In a memory-mapped TLB access, the UB bit can be read from or written to by bit 9 in the data
array.
PTEL: The same UB bit as that in the PMB is added in bit 9 in PTEL. This UB bit is written to
the UB bit in the UTLB by the LDTLB instruction. The PPN field is extended to bits 31 to 10.
CCR.CB: The CB bit in CCR is invalid. Whether a cacheable write for the P1 area is performed
in copy-back mode or write-though mode is determined by the WT bit in the PMB.
IRMCR.MT: The MT bit in IRMCR is valid for a memory-mapped PMB write.
QACR0, QACR1: AREA0[4:2]/AREA1[4:2] fields of QACR0/QACR1 are extended to
AREA0[7:2]/AREA1[7:2] corresponding to physical address [31:26]. See section 7.2.2, Queue
Address Control Register 0 (QACR0) and section 7.2.3, Queue Address Control Register 1
(QACR1).
LSA0, LSA1, LDA0, LDA1: L0SADR, L1SADR, L0DADR and L1DADR fields are extended to
bits 31 to 10. See section 8.2.2, L Memory Transfer Source Address Register 0 (LSA0), section
8.2.3, L Memory Transfer Source Address Register 1 (LSA1), section 8.2.4, L Memory Transfer
Destination Address Register 0 (LDA0), and section 8.2.5, L Memory Transfer Destination
Address Register 1 (LDA1).
When using 32-bit address mode, the following notes should be applied to software.
1. For the SE bit switching, only switching from 0 to 1 is supported in Cache and MMU disabled
boot routine after a power-on reset or manual reset.
2. After switching the SE bit, an area in which the program is allocated becomes the target of the
PMB address translation. Therefore, the area should be recorded in the PMB before switching
the SE bit. An address which may be accessed in the P1 or P2 area such as the exception
handler should also be recorded in the PMB.
3. When an external memory access occurs by an operand memory access located before the
MOV.L instruction which switches the SE bit, external memory space addresses accessed in
both address modes should be the same.
4. Note that the V bit is mapped to both address array and data array in PMB registration. That is,
first write 0 to the V bit in one of arrays and then write 1 to the V bit in another array.
Rev. 1.00 Oct. 01, 2007 Page 185 of 1956
REJ09B0256-0100