Section 7 Memory Management Unit (MMU)
Rev.1.00 Dec. 13, 2005 Page 165 of 1286
REJ09B0158-0100
7.2.7 Instruction
Re-Fetch
Inhibit Control Register (IRMCR)
When the specific resource is changed, IRMCR controls whether the instruction fetch is performed
again for the next instruction. The specific resource means the part of control registers, TLB, and
cache.
In the initial state, the instruction fetch is performed again for the next instruction after changing
the resource. However, the CPU processing performance will be lowered because the instruction
fetch is performed again for the next instruction every time the resource is changed. Therefore, it
is recommended that each bit in IRMCR is set to 1 and the specific instruction should be executed
after all necessary resources have been changed prior to execution of the program which uses
changed resources.
For details on the specific sequence, see descriptions in each resource.
31
30
29
28
27
26
25
24
23
22
21
20
19
18
17
16
Bit:
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
Initial value:
R
R
R
R
R
R
R
R
R
R
R
R
R
R
R
R
R
R2
R1
LT
MT
MC
R
R
R/W
R/W
R/W
R/W
R/W
R/W:
Bit:
Initial value:
R/W:
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
0
0
0
0
0
0
0
0
0
0
R
R
R
R
R
R
R
R
Bit Bit
Name
Initial
Value R/W
Description
31 to 5
All
0
R
Reserved
These bits are always read as 0. The write value
should always be 0.
4
R2
0
R/W
Re-Fetch Inhibit 2 after Register Change
When MMUCR, PASCR, CCR, PTEH, or RAMCR is
changed, this bit controls whether re-fetch is
performed for the next instruction.
0: Re-fetch is performed
1: Re-fetch is not performed
3
R1
0
R/W
Re-Fetch Inhibit 1 after Register Change
When a register allocated in addresses H'FF200000 to
H'FF2FFFFF is changed, this bit controls whether re-
fetch is performed for the next instruction.
0: Re-fetch is performed
1: Re-fetch is not performed
Содержание SH7780 Series
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Страница 122: ...Section 3 Instruction Set Rev 1 00 Dec 13 2005 Page 72 of 1286 REJ09B0158 0100 ...
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Страница 196: ...Section 6 Floating Point Unit FPU Rev 1 00 Dec 13 2005 Page 146 of 1286 REJ09B0158 0100 ...
Страница 292: ...Section 9 L Memory Rev 1 00 Dec 13 2005 Page 242 of 1286 REJ09B0158 0100 ...
Страница 450: ...Section 11 Local Bus State Controller LBSC Rev 1 00 Dec 13 2005 Page 400 of 1286 REJ09B0158 0100 ...
Страница 492: ...Section 12 DDR SDRAM Interface DDRIF Rev 1 00 Dec 13 2005 Page 442 of 1286 REJ09B0158 0100 ...
Страница 674: ...Section 15 Clock Pulse Generator CPG Rev 1 00 Dec 13 2005 Page 624 of 1286 REJ09B0158 0100 ...
Страница 692: ...Section 16 Watchdog Timer and Reset Rev 1 00 Dec 13 2005 Page 642 of 1286 REJ09B0158 0100 ...
Страница 726: ...Section 18 Timer Unit TMU Rev 1 00 Dec 13 2005 Page 676 of 1286 REJ09B0158 0100 ...
Страница 1004: ...Section 24 Multimedia Card Interface MMCIF Rev 1 00 Dec 13 2005 Page 954 of 1286 REJ09B0158 0100 ...
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Страница 1070: ...Section 26 Serial Sound Interface SSI Module Rev 1 00 Dec 13 2005 Page 1020 of 1286 REJ09B0158 0100 ...
Страница 1104: ...Section 27 NAND Flash Memory Controller FLCTL Rev 1 00 Dec 13 2005 Page 1054 of 1286 REJ09B0158 0100 ...
Страница 1150: ...Section 28 General Purpose I O GPIO Rev 1 00 Dec 13 2005 Page 1100 of 1286 REJ09B0158 0100 ...
Страница 1184: ...Section 29 User Break Controller UBC Rev 1 00 Dec 13 2005 Page 1134 of 1286 REJ09B0158 0100 ...
Страница 1266: ...Section 31 Electrical Characteristics Rev 1 00 Dec 13 2005 Page 1216 of 1286 REJ09B0158 0100 ...
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