Section 6 Memory Management Unit (MMU)
Rev. 1.00 Oct. 01, 2007 Page 172 of 1956
REJ09B0256-0100
3. Write to PTEL the values of the PPN, PR, SZ, C, D, WT, SH, and V bits in the page table
entry recorded in external memory.
4. When the entry to be replaced in entry replacement is specified by software, write that value to
the URC bits in MMUCR. If URC is greater than URB at this time, the value should be
changed to an appropriate value after issuing an LDTLB instruction.
5. Execute the LDTLB instruction and write the contents of PTEH and PTEL to the UTLB.
6. Finally, execute the exception handling return instruction (RTE), terminate the exception
handling routine, and return control to the normal flow. The RTE instruction should be issued
at least one instruction after the LDTLB instruction.
6.6 Memory-Mapped
TLB
Configuration
To enable the ITLB and UTLB to be managed by software, their contents are allowed to be read
from and written to by a program in the P2 area with a MOV instruction in privileged mode.
Operation is not guaranteed if access is made from a program in another area.
After the memory-mapped TLB has been accessed, execute one of the following three methods
before an access (including an instruction fetch) to an area other than the P2 area is performed.
1. Execute a branch using the RTE instruction. In this case, the branch destination may be an area
other than the P2 area.
2. Execute the ICBI instruction for any address (including non-cacheable area).
3. If the MT bit in IRMCR is 0 (initial value) before accessing the memory-mapped TLB, the
specific instruction does not need to be executed. However, note that the CPU processing
performance will be lowered because the instruction fetch is performed again for the next
instruction after MMUCR has been updated.
Note that the method 3 may not be guaranteed in the future SuperH Series. Therefore, it is
recommended that the method 1 or 2 should be used for being compatible with the future SuperH
Series.
The ITLB and UTLB are allocated to the P4 area in the virtual address space. VPN, V, and ASID
in the ITLB can be accessed as an address array, PPN, V, SZ, PR, C, and SH as a data array. VPN,
D, V, and ASID in the UTLB can be accessed as an address array, PPN, V, SZ, PR, C, D, WT, and
SH as a data array. V and D can be accessed from both the address array side and the data array
side. Only longword access is possible. Instruction fetches cannot be performed in these areas. For
reserved bits, a write value of 0 should be specified; their read value is undefined.
Содержание SH7763
Страница 2: ...Rev 1 00 Oct 01 2007 Page ii of lxvi ...
Страница 122: ...Section 2 Programming Model Rev 1 00 Oct 01 2007 Page 56 of 1956 REJ09B0256 0100 ...
Страница 144: ...Section 3 Instruction Set Rev 1 00 Oct 01 2007 Page 78 of 1956 REJ09B0256 0100 ...
Страница 170: ...Section 4 Pipelining Rev 1 00 Oct 01 2007 Page 104 of 1956 REJ09B0256 0100 ...
Страница 282: ...Section 7 Caches Rev 1 00 Oct 01 2007 Page 216 of 1956 REJ09B0256 0100 ...
Страница 378: ...Section 9 Interrupt Controller INTC Rev 1 00 Oct 01 2007 Page 312 of 1956 REJ09B0256 0100 ...
Страница 514: ...Section 12 DDR SDRAM Interface DDRIF Rev 1 00 Oct 01 2007 Page 448 of 1956 REJ09B0256 0100 ...
Страница 630: ...Section 13 PCI Controller PCIC Rev 1 00 Oct 01 2007 Page 564 of 1956 REJ09B0256 0100 ...
Страница 686: ...Section 14 Direct Memory Access Controller DMAC Rev 1 00 Oct 01 2007 Page 620 of 1956 REJ09B0256 0100 ...
Страница 710: ...Section 16 Clock Pulse Generator CPG Rev 1 00 Oct 01 2007 Page 644 of 1956 REJ09B0256 0100 ...
Страница 732: ...Section 17 Watchdog Timer and Reset WDT Rev 1 00 Oct 01 2007 Page 666 of 1956 REJ09B0256 0100 ...
Страница 752: ...Section 18 Power Down Mode Rev 1 00 Oct 01 2007 Page 686 of 1956 REJ09B0256 0100 ...
Страница 772: ...Section 19 Timer Unit TMU Rev 1 00 Oct 01 2007 Page 706 of 1956 REJ09B0256 0100 ...
Страница 824: ...Section 21 Compare Match Timer CMT Rev 1 00 Oct 01 2007 Page 758 of 1956 REJ09B0256 0100 ...
Страница 1060: ...Section 23 Gigabit Ethernet Controller GETHER Rev 1 00 Oct 01 2007 Page 994 of 1956 REJ09B0256 0100 ...
Страница 1062: ...Section 24 IP Security Accelerator SECURITY Rev 1 00 Oct 01 2007 Page 996 of 1956 REJ09B0256 0100 ...
Страница 1124: ...Section 26 I 2 C Bus Interface IIC Rev 1 00 Oct 01 2007 Page 1058 of 1956 REJ09B0256 0100 ...
Страница 1184: ...Section 27 Serial Communication Interface with FIFO SCIF Rev 1 00 Oct 01 2007 Page 1118 of 1956 REJ09B0256 0100 ...
Страница 1350: ...Section 30 SIM Card Module SIM Rev 1 00 Oct 01 2007 Page 1284 of 1956 REJ09B0256 0100 ...
Страница 1484: ...Section 33 Audio Codec Interface HAC Rev 1 00 Oct 01 2007 Page 1418 of 1956 REJ09B0256 0100 ...
Страница 1560: ...Section 35 USB Host Controller USBH Rev 1 00 Oct 01 2007 Page 1494 of 1956 REJ09B0256 0100 ...
Страница 1720: ...Section 37 LCD Controller LCDC Rev 1 00 Oct 01 2007 Page 1654 of 1956 REJ09B0256 0100 ...
Страница 2025: ......
Страница 2026: ...SH7763 Hardware Manual ...