r5s77631ay266bgv Renesas Electronics Corporation., r5s77631ay266bgv Datasheet - Page 232
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r5s77631ay266bgv
Manufacturer Part Number
r5s77631ay266bgv
Description
Renesas 32-bit Risc Microcomputer Superhtm Risc Engine Family Sh-4a Series
Manufacturer
Renesas Electronics Corporation.
Datasheet
1.R5S77631AY266BGV.pdf
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Section 6 Memory Management Unit (MMU)
6.5
There are seven MMU exceptions: instruction TLB multiple hit exception, instruction TLB miss
exception, instruction TLB protection violation exception, data TLB multiple hit exception, data
TLB miss exception, data TLB protection violation exception, and initial page write exception.
Refer to figures 6.9 and 6.10 for the conditions under which each of these exceptions occurs.
6.5.1
An instruction TLB multiple hit exception occurs when more than one ITLB entry matches the
virtual address to which an instruction access has been made. If multiple hits occur when the
UTLB is searched by hardware in hardware ITLB miss handling, an instruction TLB multiple hit
exception will result.
When an instruction TLB multiple hit exception occurs, a reset is executed and cache coherency is
not guaranteed.
Hardware Processing: In the event of an instruction TLB multiple hit exception, hardware
carries out the following processing:
1. Sets the virtual address at which the exception occurred in TEA.
2. Sets exception code H'140 in EXPEVT.
3. Branches to the reset handling routine (H'A000 0000).
Software Processing (Reset Routine): The ITLB entries which caused the multiple hit exception
are checked in the reset handling routine. This exception is intended for use in program
debugging, and should not normally be generated.
Rev. 1.00 Oct. 01, 2007 Page 166 of 1956
REJ09B0256-0100
MMU Exceptions
Instruction TLB Multiple Hit Exception
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