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SAFC161PI Scheda tecnica(PDF) 53 Page - Infineon Technologies AG

Il numero della parte SAFC161PI
Spiegazioni elettronici  16-Bit Single-Chip Microcontroller
PDF  400 Pages
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Produttore elettronici  INFINEON [Infineon Technologies AG]
Homepage  http://www.infineon.com
Logo INFINEON - Infineon Technologies AG

SAFC161PI Scheda tecnica(HTML) 53 Page - Infineon Technologies AG

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User’s Manual
4-5
1999-08
Figure 4-2
Sequential Instruction Pipelining
Standard Branch Instruction Processing
Instruction pipelining helps to speed sequential program processing. In the case that a
branch is taken, the instruction which has already been fetched providently is mostly not
the instruction which must be decoded next. Thus, at least one additional machine cycle
is normally required to fetch the branch target instruction. This extra machine cycle is
provided by means of an injected instruction (see figure below).
Figure 4-3
Standard Branch Instruction Pipelining
If a conditional branch is not taken, there is no deviation from the sequential program
flow, and thus no extra time is required. In this case the instruction after the branch
instruction will enter the decode stage of the pipeline at the beginning of the next
machine cycle after decode of the conditional branch instruction.
1 Machine
Cycle
FETCH
I
2
I
1
I
3
I
2
I
1
I
4
I
3
I
2
I
1
I
6
I
5
I
4
I
3
I
5
I
4
I
3
I
2
I
1
DECODE
EXECUTE
WRITEBACK
time
1 Machine
Cycle
FETCH
I
n+2
BRANCH
I
n
. . .
I
TARGET
(I
INJECT)
BRANCH
I
n
I
TARGET+1
I
TARGET
(I
INJECT)
BRANCH
I
TARGET+3
I
TARGET+2
I
TARGET+1
I
TARGET
I
TARGET+2
I
TARGET+1
I
TARGET
(I
INJECT)
BRANCH
I
n
. . .
. . .
DECODE
EXECUTE
WRITEBACK
time
Injection



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