參數(shù)資料
型號: LR4500
廠商: LSI Corporation
英文描述: Superscalar Microprocessor(超標(biāo)量微處理器)
中文描述: 超標(biāo)量微處理器(超標(biāo)量微處理器)
文件頁數(shù): 23/172頁
文件大?。?/td> 1142K
代理商: LR4500
Pipeline Architecture
2-7
2.6 Pipeline Architecture
The LR4500 has two identical concurrent five-stage pipelines that are
part of the CW4011 core. These pipelines provide the LR4500 with its
superscalar capabilities. As shown in
Figure 2.3
, there is an even
pipeline and an odd pipeline.
Each of the five pipeline stages can be viewed as a pair of instruction
“slots” (one slot for each pipeline.) So an instruction in the even pipeline
at the EX stage may be referred to as ‘the even slot of the EX stage.’ In
addition to the five basic pipeline stages, each pipeline also has a
conditional queuing stage (Q).
Figure 2.3 LR4500 Instruction Pipeline
The first two pipeline stages and the queuing stage are used during
instruction fetch, and the last three stages are used during instruction
execution. Once a stage has accepted an instruction from the previous
stage it must hold the instruction for re-execution in case the pipeline
stalls. The pipeline stages perform the following functions:
IF (Instruction Fetch). The LR4500 fetches the instruction during the
first stage.
Q (Queuing). This conditional queueing stage boosts branch
instructions. Depending on the branches and register conflicts,
instructions may either enter this stage or be advanced straight to the
RD stage.
EX
CR
RD
Q
IF
Instruction Fetch
Instruction Execution
WB
EX
CR
RD
Q
IF
WB
Even Slot,
Pipeline 0
Odd Slot,
Pipeline 1
1. Branch instruction encountered.
2. Q state bypassed.
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