HD6417706 RENESAS [Renesas Technology Corp], HD6417706 Datasheet - Page 111
HD6417706
Manufacturer Part Number
HD6417706
Description
Renesas 32-Bit RISC Microcomputer Super RISC engine Family/SH7700 Series
Manufacturer
RENESAS [Renesas Technology Corp]
Datasheet
1.HD6417706.pdf
(709 pages)
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3.4
3.4.1
There are two kinds of MMU hardware management as follows:
1. The MMU decodes the virtual address accessed by a process and performs address translation
2. In address translation, the MMU receives page management information from the TLB, and
3.4.2
There are three kinds of MMU software management, as follows.
1. MMU register setting. MMUCR setting, in particular, should be performed in areas P1 and P2
2. TLB entry recording, deletion, and reading. TLB entry recording can be done in two ways by
3. MMU exception processing. When an MMU exception is generated, it is handled on the basis
When single virtual memory mode is used, it is possible to create a state in which physical
memory access is enabled in the privileged mode only by clearing the share status bit (SH) to 0 to
specify recording of all TLB entries. This strengthens inter-process memory protection, and
enables special access levels to be created in the privileged mode only.
Recording a 1-kbyte page TLB entry may result in a synonym problem. See section 3.4.4,
Avoiding Synonym Problems.
by controlling the TLB in accordance with the MMUCR settings.
determines the MMU exception and whether the cache is to be accessed (using the C bit). For
details of the determination method and the hardware processing, see section 3.5, MMU
Exceptions.
for which address translation is not performed. Also, since SV and IX bit changes constitute
address translation system changes, in this case, TLB flushing should be performed by
simultaneously writing 1 to the TF bit also. Since MMU exceptions are not generated in the
MMU disabled state with the AT bit cleared to 0, use in the disabled state must be avoided
with software that does not use the MMU.
using the LDTLB instruction, or by writing directly to the memory-mapped TLB. For TLB
entry deletion and reading, the memory allocation TLB can be accessed. See section 3.4.3,
MMU Instruction (LDTLB), for details of the LDTLB instruction, and section 3.6,
Configuration of the Memory-Mapped TLB, for details of the memory-mapped TLB.
of information set from the hardware side. See section 3.5, MMU Exceptions, for details.
MMU Functions
MMU Hardware Management
MMU Software Management
Rev. 4.00, 03/04, page 65 of 660
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