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4.
Pipelining
Rev.1.00 Jan. 10, 2008 Page 65 of 1658
REJ09B0261-0100
Section 4 Pipelining
This LSI is a 2-ILP (instruction-level-parallelism) superscalar pipelining microprocessor.
Instruction execution is pipelined, and two instructions can be executed in parallel.
4.1
Pipelines
Figure 4.1 shows the basic pipelines. Normally, a pipeline consists of eight stages: instruction
fetch (I1/I2/I3), decode and register read (ID), execution (E1/E2/E3), and write-back (WB). An
instruction is executed as a combination of basic pipelines.
I1
I2
ID
E1
E2
E3
WB
I1
I2
ID
FS1
FS2
FS4
FS3
FS
I1
I2
I3
ID
FE1
FE2
FE3
FE4
FE5
FE6
FS
I1
I2
ID
E1
E2
E3
WB
I1
I2
ID
E1
E2
E3
WB
I1
I2
I3
I3
I3
I3
I3
ID
E1
E2
E3
WB
1. General Pipeline
-
Instruction fetch
-
Instruction
decode
-
Issue
-
Re
g
ister read
-
Write-back
-
Operation
-
Forwardin
g
-
Address
calculation
2. General Load/Store Pipeline
3. Special Pipeline
4. Special Load/Store Pipeline
5. Floatin
g
-Point Pipeline
6. Floatin
g
-Point Extended Pipeline
-
Instruction fetch
-
Instruction
decode
-
Issue
-
Operation
-
Write-back
-
Operation
-
Operation
-
Re
g
ister read
-
Forwardin
g
-
Operation
-
Instruction fetch
-Instruction
decode
-Issue
-Re
g
ister read
-Forwardin
g
-
Operation
-
Operation
-
Operation
-
Operation
-
Operation -Operation
-
Write-back
-
Instruction fetch
-
Instruction
decode
-
Issue
-
Re
g
ister read
-
Write-back
-
Memory data access
-
Forwardin
g
-
Instruction fetch
-
Instruction
decode
-
Issue
-
Re
g
ister read
-
Write-back
-
Operation
-
Instruction fetch
-
Instruction
decode
-
Issue
-
Re
g
ister read
-
Predecode
-
Predecode
-
Predecode
-
Predecode
-
Predecode
-
Predecode
Figure 4.1 Basic Pipelines
Содержание SH7781
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Страница 694: ...13 PCI Controller PCIC Rev 1 00 Jan 10 2008 Page 664 of 1658 REJ09B0261 0100 ...
Страница 762: ...14 Direct Memory Access Controller DMAC Rev 1 00 Jan 10 2008 Page 732 of 1658 REJ09B0261 0100 ...
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Страница 846: ...18 Timer Unit TMU Rev 1 00 Jan 10 2008 Page 816 of 1658 REJ09B0261 0100 ...
Страница 1292: ...24 Multimedia Card Interface MMCIF Rev 1 00 Jan 10 2008 Page 1262 of 1658 REJ09B0261 0100 ...
Страница 1326: ...25 Audio Codec Interface HAC Rev 1 00 Jan 10 2008 Page 1296 of 1658 REJ09B0261 0100 ...
Страница 1482: ...28 General Purpose I O Ports GPIO Rev 1 00 Jan 10 2008 Page 1452 of 1658 REJ09B0261 0100 ...
Страница 1538: ...30 User Debugging Interface H UDI Rev 1 00 Jan 10 2008 Page 1508 of 1658 REJ09B0261 0100 ...
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