81 lines
3.0 KiB
TeX
81 lines
3.0 KiB
TeX
\chapter{Quick reference}
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\label{ch:ref}
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\section{SPI opcodes}
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\begin{tabularx}{\textwidth}{C{1.4cm} L{3.2cm} C{2.4cm} Y}
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\toprule
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\rowh \thd{Value} & \thd{Name} & \thd{Response} & \thd{Summary} \\
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\midrule
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\op{0x00} & NOP & --- & idle \\
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\rowa \op{0x01} & WRITE\_RAM & --- & PSRAM block write \\
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\op{0x02} & READ\_RAM & \code{len} B & PSRAM block read \\
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\rowa \op{0x0F} & RESET & --- & engine reset + STATUS latch \\
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\op{0x10} & SET\_BASE & --- & set base/register (sel 0..10) \\
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\rowa \op{0x20} & START & --- & single-layer start \\
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\op{0x21} & STATUS & 1 B & busy(live)/done(sticky) \\
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\rowa \op{0x22} & READ\_OUTPUT & N\_NEURONS B & \code{y\_bus} \\
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\op{0x23} & RUN\_NETWORK & --- & multi-layer start \\
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\rowa \op{0x30} & READ\_CONFIG & 11 B & configuration record \\
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\bottomrule
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\end{tabularx}
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\section{STATUS byte}
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\begin{center}
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\begin{tikzpicture}[font=\scriptsize]
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\foreach \i/\lbl [count=\x from 0] in {7/0,6/0,5/0,4/0,3/0,2/0,1/{done},0/{busy}}{
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\node[fnreg,minimum width=13mm,minimum height=9mm] (b\x) at (\x*13mm,0) {\lbl};
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\node[font=\tiny,text=fnGrey,above=0.5mm of b\x] {bit \i};
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}
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\node[fill=fnAmber,text=white,rounded corners=1pt,inner sep=1.5pt,font=\tiny]
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at (b7.center){reserved = 0};
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\node[fill=fnTeal,text=white,rounded corners=1pt,inner sep=1.5pt,font=\tiny]
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at (b6.center){};
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\end{tikzpicture}
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\end{center}
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\code{done} is sticky, clear-on-read; \code{busy} is live.
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\section{SET\_BASE selectors}
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\begin{multicols}{2}\footnotesize
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\begin{itemize}
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\item 0 --- \code{x\_base}
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\item 1 --- \code{w\_base}
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\item 2 --- \code{bias\_addr}
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\item 3 --- \code{table\_base}
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\item 4 --- \code{buf\_a\_base}
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\columnbreak
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\item 5 --- \code{buf\_b\_base}
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\item 6 --- \code{activation} (single-layer)
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\item 7 --- \code{n\_inputs\_real} (single-layer)
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\item 8 --- \code{n\_neurons\_real} (single-layer)
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\item 9 --- \code{num\_neurons\_graph} (Type \#2)
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\item 10 --- \code{n\_out} (Type \#2)
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\end{itemize}
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\end{multicols}
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\section{Descriptor table (11 bytes/layer, MSB-first)}
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\begin{center}
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\begin{tikzpicture}[font=\scriptsize,node distance=0mm]
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\node[fnreg,minimum width=20mm,minimum height=8mm](a){\code{w\_base}\\3B};
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\node[fnreg,minimum width=20mm,minimum height=8mm,right=0mm of a](b){\code{bias\_addr}\\3B};
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\node[fnreg,minimum width=14mm,minimum height=8mm,right=0mm of b](c){\code{act}\\1B};
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\node[fnreg,minimum width=22mm,minimum height=8mm,right=0mm of c](d){\code{n\_inputs\_real}\\2B};
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\node[fnreg,minimum width=22mm,minimum height=8mm,right=0mm of d](e){\code{n\_neurons\_real}\\2B};
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\end{tikzpicture}
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\end{center}
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\section{Build parameters}
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\begin{multicols}{2}\footnotesize
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\begin{itemize}
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\item \code{DATA\_WIDTH} --- 8 (INT8)
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\item \code{ACC\_WIDTH} --- 32 (INT32)
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\item \code{N\_INPUTS} --- max inputs
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\item \code{N\_NEURONS} --- max neurons
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\item \code{PARALLEL} --- simultaneous MACs
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\columnbreak
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\item \code{N\_LAYERS} --- max layers
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\item \code{ADDR\_WIDTH} --- 23 (8 MB)
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\item \code{MEM\_DATA\_WIDTH} --- 16
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\item \code{CLK\_FREQ\_MHZ} --- PSRAM timing
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\end{itemize}
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\end{multicols}
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