r5s77631ay266bgv Renesas Electronics Corporation., r5s77631ay266bgv Datasheet - Page 236

• Manufacturer Part Number: r5s77631ay266bgv
• Description: Renesas 32-bit Risc Microcomputer Superhtm Risc Engine Family Sh-4a Series
• Manufacturer: Renesas Electronics Corporation.

Section 6 Memory Management Unit (MMU)
9. Branches to the address obtained by adding offset H'0000 0400 to the contents of VBR, and
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
2. When the entry to be replaced in entry replacement is specified by software, write that value to
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
6.5.6
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
4. Sets the PC value indicating the address of the instruction at which the exception occurred in
5. Sets the SR contents at the time of the exception in SSR. The R15 contents at this time are
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.
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starts the data TLB miss exception handling routine.
entry recorded in the external memory address translation table.
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.
handling routine, and return control to the normal flow. The RTE instruction should be issued
at least one instruction after the LDTLB instruction.
(OCBP, OCBWB: read; OCBI, MOVCA.L: write).
SPC. If the exception occurred at a delay slot, sets the PC value indicating the address of the
delayed branch instruction in SPC.
saved in SGR.
Data TLB Protection Violation Exception