Section 7 Memory Management Unit (MMU)
Rev.1.00 Dec. 13, 2005 Page 181 of 1286
REJ09B0158-0100
9. Branches to the address obtained by adding offset H'0000 0400 to the contents of VBR, and
starts the data TLB miss exception handling routine.
Software Processing (Data TLB Miss Exception Handling Routine): Software is responsible
for searching the external memory page table and assigning the necessary page table entry.
Software should carry out the following processing in order to find and assign the necessary page
table entry.
1. Write to PTEL the values of the PPN, PR, SZ, C, D, SH, V, and WT bits in the page table
entry recorded in the external memory address translation table.
2. 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.
3. Execute the LDTLB instruction and write the contents of PTEH and PTEL to the UTLB.
4. 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.
7.5.6
Data TLB Protection Violation Exception
A data TLB protection violation exception occurs when, even though a UTLB entry contains
address translation information matching the virtual address to which a data access is made, the
actual access type is not permitted by the access right specified by the PR bit. The data TLB
protection violation exception processing carried out by hardware and software is shown below.
Hardware Processing: In the event of a data TLB protection violation exception, hardware
carries out the following processing:
1. Sets the VPN of the virtual address at which the exception occurred in PTEH.
2. Sets the virtual address at which the exception occurred in TEA.
3. Sets exception code H'0A0 in the case of a read, or H'0C0 in the case of a write in EXPEVT
(OCBP, OCBWB: read; OCBI, MOVCA.L: write).
4. Sets the PC value indicating the address of the instruction at which the exception occurred in
SPC. If the exception occurred at a delay slot, sets the PC value indicating the address of the
delayed branch instruction in SPC.
5. Sets the SR contents at the time of the exception in SSR. The R15 contents at this time are
saved in SGR.
6. Sets the MD bit in SR to 1, and switches to privileged mode.
7. Sets the BL bit in SR to 1, and masks subsequent exception requests.
8. Sets the RB bit in SR to 1.
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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