HD6417705F133V Datasheet, PDF (133/741 Pages) Renesas Technology Corp – Renesas 32-Bit RISC Microcomputer SuperH RISC engine Family/SH7700 Series

3.5 MMU Exceptions
When the address translation unit of the MMU is enabled, occurrence of the MMU exception is
checked following the CPU address error check. There are four MMU exceptions: TLB miss, TLB
protection violation, TLB invalid, and initial page write, and these MMU exceptions are checked
in this order.
3.5.1 TLB Miss Exception
A TLB miss results when the virtual address and the address array of the selected TLB entry are
compared and no match is found. TLB miss exception processing includes both hardware and
software operations.
Hardware Operations: In a TLB miss, this 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'040 for a load access, or H'060 for a store access, is written to the
EXPEVT register.
4. The PC value indicating the address of the instruction in which the exception occurred is
written to the save program counter (SPC). If the exception occurred in a delay slot, the PC
value indicating the address of the related delayed branch instruction is written to the SPC.
5. The contents of the status register (SR) at the time of the exception are written to the save
status register (SSR).
6. The mode (MD) bit in SR is set to 1 to place the privileged mode.
7. The block (BL) bit in SR is set to 1 to mask any further exception requests.
8. The register bank (RB) bit in SR is set to 1.
9. The RC field in the MMU control register (MMUCR) is incremented by 1 when all entries
indexed are valid. When some entries indexed are invalid, the smallest way number of them is
set in RC.
10. Execution branches to the address obtained by adding the value of the VBR contents and
H'00000400 to invoke the user-written TLB miss exception handler.
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
(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.
Rev. 2.00, 09/03, page 85 of 690