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Added a basic description of the pipeline
This commit is contained in:
Andreas Traber
parent
6f3358adfd
commit
a8987b5890
4 changed files with 695 additions and 0 deletions
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docs/datasheet/content/pipeline.tex
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docs/datasheet/content/pipeline.tex
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\chapter{Pipeline}
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\label{chap:pipeline}
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\rvcore has a fully independent pipeline, meaning that whenever possible data
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will propagate through the pipeline and therefor does not suffer from any
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unneeded stalls.
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The pipeline design is easily extendable to incorporate out-of-order
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completion. E.g. it would be possible to complete an instruction that only
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needs the EX stage before the WB stage, that is currently blocked waiting for
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an rvalid, is ready.
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Currently this is not done in \rvcore, but might be added in the future.
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Figure~\ref{fig:pipeline} shows the control signals relevant for the pipeline
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operation. Running from right to left are the main control signals, the
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\signal{ready} signals of each pipeline stage.
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Each pipeline stage has two control inputs: an enable and a clear. The enable
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activates the pipeline stage and the core moves forward by one instruction. The
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clear removes the instruction from the pipeline stage as it is completed.
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At every pipeline stage, when the \signal{ready} coming from the stage to the
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right is high, but the valid signal of the stage is low, the stage is cleared.
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If the valid signal is high, it is enabled.
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Going from right to left every stage is independent, no stage depends on the
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stage on its left. Going from left to right every stage depends on its right
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neighbor and can only continue when it is ready.
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This means that in addition that a single stage has to be ready, also the stage
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on its right has to be ready to move on.
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\begin{figure}[H]
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\centering
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\includegraphics[width=0.9\textwidth]{./figures/pipeline}
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\caption{\rvcore Pipeline.}
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\label{fig:pipeline}
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\end{figure}
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\begin{boxnote}
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In contrast to \orion there is no global stall controller any more, instead
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every stage manages its own dependencies. The main controller of \rvcore is now
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only responsible for control flow operations, i.e. flushing the pipe, branches,
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jumps and exceptions.
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\end{boxnote}
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@ -37,6 +37,7 @@
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\input{./content/mac.tex}
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\input{./content/aluext.tex}
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\input{./content/hwloop.tex}
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\input{./content/pipeline.tex}
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\input{./content/rf.tex}
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\input{./content/csr.tex}
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\input{./content/perfcounters.tex}
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641
docs/datasheet/figures_raw/pipeline.obj
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docs/datasheet/figures_raw/pipeline.obj
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minilines(12,20,0,0,1,0,0,[
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mini_line(12,16,4,0,0,0,[
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str_block(0,12,16,4,0,-1,0,0,0,[
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minilines(12,20,0,0,1,0,0,[
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mini_line(12,16,4,0,0,0,[
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str_block(0,12,16,4,0,-1,0,0,0,[
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str_seg('black','Helvetica-Bold',1,97920,12,16,4,0,-1,0,0,0,0,0,
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"C")])
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])
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text('black',896,476,1,1,1,12,20,288687,16,4,0,0,0,0,-65534,12,20,0,0,"",0,0,0,0,492,'',[
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minilines(12,20,0,0,1,0,0,[
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mini_line(12,16,4,0,0,0,[
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str_block(0,12,16,4,0,-1,0,0,0,[
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str_seg('black','Helvetica-Bold',1,97920,12,16,4,0,-1,0,0,0,0,0,
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"C")])
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])
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])]).
|
||||
|
|
@ -55,6 +55,8 @@
|
|||
|
||||
\usepackage{enumitem}
|
||||
|
||||
\usepackage{tcolorbox}
|
||||
|
||||
\usepackage{pdflscape}
|
||||
|
||||
|
||||
|
|
@ -115,3 +117,10 @@
|
|||
\textbf{Operation:} \texttt{#2}%
|
||||
}
|
||||
|
||||
\newenvironment{boxnote}%
|
||||
{%
|
||||
\begin{tcolorbox}[colback=red!5!white,colframe=red!75!black,title=Note]%
|
||||
}%
|
||||
{%
|
||||
\end{tcolorbox}%
|
||||
}%
|
||||
|
|
|
|||
Loading…
Add table
Add a link
Reference in a new issue