HD6417706 RENESAS [Renesas Technology Corp], HD6417706 Datasheet - Page 116

• Manufacturer Part Number: HD6417706
• Description: Renesas 32-Bit RISC Microcomputer Super RISC engine Family/SH7700 Series
• Manufacturer: RENESAS [Renesas Technology Corp]

Software (TLB Miss Handler) Operations: The software searches the page tables in external
memory and allocates the required page table entry. Upon retrieving the required page table entry,
software must execute the following operations:
1. Write the value of the physical page number (PPN) field and the protection key (PR), page size
2. If using software for way selection for entry replacement, write the desired value to the RC
3. Issue the LDTLB instruction to load the contents of PTEH and PTEL into the TLB.
4. Issue the return from exception handler (RTE) instruction to terminate the handler routine and
3.5.2
A TLB protection violation exception results when the virtual address and the address array of the
selected TLB entry are compared and a valid entry is found to match, but the type of access is not
permitted by the access rights specified in the PR field. TLB protection violation exception
processing includes both hardware and software operations.
Hardware Operations: In a TLB protection violation exception, this LSI's hardware executes a
set of prescribed operations, as follows:
1. The VPN field of the virtual address causing the exception is written to the PTEH register.
2. The virtual address causing the exception is written to the TEA register.
3. Either exception code H'0A0 for a load access, or H'0C0 for a store access, is written to the
4. The PC value indicating the address of the instruction in which the exception occurred is
5. The contents of SR at the time of the exception are written to SSR.
6. The MD bit in SR is set to 1, and switched to the privileged mode.
7. The BL bit in SR is set to 1 to mask any further exception requests.
8. The RB bit in SR is set to 1.
9. The way that generated the exception is set in the RC field in MMUCR.
10. Execution branches to the address obtained by adding the value of the VBR contents and
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(SZ), cacheable (C), dirty (D), share status (SH), and valid (V) bits of the page table entry
recorded in the address translation table in the external memory into the PTEL register in this
LSI.
field in MMUCR.
return to the instruction stream.
EXPEVT register.
written into SPC (if the exception occurred in a delay slot, the PC value indicating the address
of the related delayed branch instruction is written into SPC).
H'00000100 to invoke the TLB protection violation exception handler.
TLB Protection Violation Exception