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參數(shù)資料
| 型號(hào)： | μPD70F3003 |
| 廠商： | NEC Corp. |
| 英文描述： | 16/32 Bit Single Chip Microcontrollers(16/32 位單片微控制器) |
| 中文描述： | 16/32位單片機(jī)微控制器（16/32位單片微控制器） |
| 文件頁(yè)數(shù)： | 126/141頁(yè) |
| 文件大小： | 374K |
| 代理商： | ΜPD70F3003 |
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CHAPTER 8 PIPELINE
114
8.4.2 Short path
The V850 family provides on chip a short path that allows the use of the execution result of the preceding instruction
by the following instruction before write back (WB) is completed for the previous instruction.
Example 1.
Execution result of arithmetic operation instruction and logical operation used by instruction
following immediately after
V850 family (on-chip short path)
The execution result of the preceding instruction can be used for the ID stage of the instruction
following immediately after as soon as the result is out (EX stage), without having to wait for write
back to be completed.
Not V850 family (No short path)
The ID stage of the instruction following immediately after is delayed until write back of the
previous instruction is completed.
– : Idle inserted for wait
: Short path
Example 2.
Data read from memory by the load instruction used by instruction following immediately after
V850 family (on-chip short path)
The execution result of the preceding instruction can be used for the ID stage of the instruction
following immediately after as soon as the result is out (MEM stage), without having to wait for
write back to be completed.
Not V850 family (No short path)
The ID stage of the instruction following immediately after is delayed until write back of the
previous instruction is completed.
IL :
– :
Idle inserted for data wait by interlock function
Idle inserted for wait
Short path
:
IF
ID
IF
EX
ID
MEM
EX
WB
MEM
WB
ADD 2, R6
MOV R6, R7
1
2
3
4
5
6
IF
ID
IF
EX
–
MEM
–
WB
ID
EX
ADD 2, R6
MOV R6, R7
MEM
WB
1
2
3
4
5
6
7
8
IF
ID
IF
EX
IL
IF
MEM
ID
–
WB
EX
ID
IF
MEM
EX
ID
LD [R4], R6
ADD 2, R6
Next instruction
Next to next instruction
WB
MEM
EX
MEM
WB
WB
1
2
3
4
5
6
7
8
9
IF
ID
IF
EX
–
MEM
–
WB
ID
IF
EX
ID
IF
LD [R4], R6
ADD 2, R6
Next instruction
Next to next instruction
MEM
EX
ID
EX
MEM
MEM
WB
WB
WB
1
2
3
4
5
6
7
8
9
10
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