SAFC161PI datasheet(53/400 Pages) INFINEON | 16-Bit Single-Chip Microcontroller

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SAFC161PI датащи(PDF) 53 Page - Infineon Technologies AG

номер детали	SAFC161PI

подробное описание детали	16-Bit Single-Chip Microcontroller

PDF	400 Pages

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производитель	INFINEON [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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