Section 4 Pipelining
Rev.1.00 Dec. 13, 2005 Page 87 of 1286
REJ09B0158-0100
4.3
Issue Rates and Execution Cycles
Instruction execution cycles are summarized in table 4.4. Instruction Group in the table 4.4
corresponds to the category in the table 4.2. Penalty cycles due to a pipeline stall are not
considered in the issue rates and execution cycles in this section.
1. Issue Rate
I1
I2
ID
S1
S2
S3
WB
Issue rate: 3
E2S2
E3S3
WB
Issue rates indicates the issue period between one instruction and next instruction.
E.g. AND.B instruction
E1S1
I1
I2
ID
S1
S2
S3
WB
MS
S2
S3
WB
S1
ID
ID
ID
(I1)
(ID)
(I2)
Next instruction
M3
M2
Issue rate: 2
(I1)
(ID)
(I2)
E.g. MAC.W instruction
Execution cycles indicates the cycle counts an instruction occupied the pipeline based on the next rules.
CPU instruction
E.g. AND.B instruction
I1
I2
ID
S1
S2
S3
WB
Execution Cycles: 3
E2S2
E3S3
WB
E1S1
ID
ID
I1
I2
ID
S1
S2
S3
WB
MS
S2
S3
WB
S1
ID
M3
M2
E.g. MAC.W instruction
Execution Cycles: 4
2. Execution Cycles
Next instruction
FPU instruction
E.g. FMUL instruction
Execution Cycles: 14
E.g. FDIV instruction
FE1
FE2
FE3
FE4
FE5
FE6
FE1 FE2 FE3 FE4 FE5 FE6
FS
FE1
FE2
FE3
FE4
FE5
FE6
FS
FE1
FE2
FE3
FE4
FE5
FE6
FS
I1
I2
ID
I1
I2
ID
Divider occupation cycle
FS
FE3 FE4 FE5 FE6
FS
Execution Cycles: 3
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 ...
Страница 146: ...Section 4 Pipelining Rev 1 00 Dec 13 2005 Page 96 of 1286 REJ09B0158 0100 ...
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 ...
Страница 1032: ...Section 25 Audio Codec Interface HAC Rev 1 00 Dec 13 2005 Page 982 of 1286 REJ09B0158 0100 ...
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 ...
Страница 1328: ...Appendix Rev 1 00 Dec 13 2005 Page 1278 of 1286 REJ09B0158 0100 ...
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