From: Clifford Wolf <clifford@clifford.at>
Date: Tue, 18 Feb 2014 18:37:39 +0000 (+0100)
Subject: Progress in presentation
X-Git-Tag: yosys-0.3.0~135
X-Git-Url: https://git.libre-soc.org/?a=commitdiff_plain;h=3d9da919d8ec2f73df77dc1df02b132b12241d8e;p=yosys.git

Progress in presentation
---

diff --git a/manual/PRESENTATION_ExAdv.tex b/manual/PRESENTATION_ExAdv.tex
index 80210b96d..e42a535f4 100644
--- a/manual/PRESENTATION_ExAdv.tex
+++ b/manual/PRESENTATION_ExAdv.tex
@@ -406,7 +406,42 @@ input values to cells.
 \subsubsection{Handling shorted inputs}
 
 \begin{frame}{\subsubsecname}
-TBD
+\begin{itemize}
+\item The special parameters {\tt \_TECHMAP\_BITS\_CONNMAP\_} and
+{\tt \_TECHMAP\_CONNMAP\_\it <port-name>\tt \_} can be used to handle shorted inputs.
+\medskip
+\item Each bit of the port correlates to an {\tt \_TECHMAP\_BITS\_CONNMAP\_} bits wide
+number in {\tt \_TECHMAP\_CONNMAP\_\it <port-name>\tt \_}.
+\medskip
+\item Each unique signal bit is assigned its own number. Identical fields in the {\tt
+\_TECHMAP\_CONNMAP\_\it <port-name>\tt \_} parameters mean shorted signal bits.
+\medskip
+\item The numbers 0-3 are reserved for {\tt 0}, {\tt 1}, {\tt x}, and {\tt z} respectively.
+\medskip
+\item Example use-cases:
+\begin{itemize}
+\item Detecting shared clock or control signals in memory interfaces.
+\item In some cases this can be used for for optimization.
+\end{itemize}
+\end{itemize}
+\end{frame}
+
+\begin{frame}[t]{\subsubsecname{} -- Example}
+\vbox to 0cm{
+\vskip4.5cm
+\hskip6.5cm\includegraphics[width=5cm,trim=0 0cm 0 0cm]{PRESENTATION_ExAdv/addshift.pdf}
+\vss
+}
+\vskip-0.6cm
+\begin{columns}
+\column[t]{6cm}
+\vskip-0.4cm
+\lstinputlisting[basicstyle=\ttfamily\fontsize{7pt}{8pt}\selectfont, language=verilog]{PRESENTATION_ExAdv/addshift_map.v}
+\column[t]{4.2cm}
+\vskip-0.6cm
+\lstinputlisting[basicstyle=\ttfamily\fontsize{8pt}{10pt}\selectfont, frame=single, language=verilog]{PRESENTATION_ExAdv/addshift_test.v}
+\lstinputlisting[basicstyle=\ttfamily\fontsize{8pt}{10pt}\selectfont, frame=single, language=ys, lastline=5]{PRESENTATION_ExAdv/addshift_test.ys}
+\end{columns}
 \end{frame}
 
 \subsubsection{Notes on using techmap}
diff --git a/manual/PRESENTATION_ExAdv/Makefile b/manual/PRESENTATION_ExAdv/Makefile
index 3bbc239a4..2a2858e5f 100644
--- a/manual/PRESENTATION_ExAdv/Makefile
+++ b/manual/PRESENTATION_ExAdv/Makefile
@@ -1,5 +1,5 @@
 
-all: select_01.pdf red_or3x1.pdf sym_mul.pdf mymul.pdf mulshift.pdf
+all: select_01.pdf red_or3x1.pdf sym_mul.pdf mymul.pdf mulshift.pdf addshift.pdf
 
 select_01.pdf: select_01.v select_01.ys
 	../../yosys select_01.ys
@@ -16,3 +16,6 @@ mymul.pdf: mymul_*
 mulshift.pdf: mulshift_*
 	../../yosys mulshift_test.ys
 
+addshift.pdf: addshift_*
+	../../yosys addshift_test.ys
+
diff --git a/manual/PRESENTATION_ExAdv/addshift_map.v b/manual/PRESENTATION_ExAdv/addshift_map.v
new file mode 100644
index 000000000..b6d91b01b
--- /dev/null
+++ b/manual/PRESENTATION_ExAdv/addshift_map.v
@@ -0,0 +1,20 @@
+module \$add (A, B, Y);
+  parameter A_SIGNED = 0;
+  parameter B_SIGNED = 0;
+  parameter A_WIDTH = 1;
+  parameter B_WIDTH = 1;
+  parameter Y_WIDTH = 1;
+  
+  input [A_WIDTH-1:0] A;
+  input [B_WIDTH-1:0] B;
+  output [Y_WIDTH-1:0] Y;
+  
+  parameter _TECHMAP_BITS_CONNMAP_ = 0;
+  parameter _TECHMAP_CONNMAP_A_ = 0;
+  parameter _TECHMAP_CONNMAP_B_ = 0;
+  
+  wire _TECHMAP_FAIL_ = A_WIDTH != B_WIDTH || B_WIDTH < Y_WIDTH ||
+                        _TECHMAP_CONNMAP_A_ != _TECHMAP_CONNMAP_B_;
+  
+  assign Y = A << 1;
+endmodule
diff --git a/manual/PRESENTATION_ExAdv/addshift_test.v b/manual/PRESENTATION_ExAdv/addshift_test.v
new file mode 100644
index 000000000..b53271faa
--- /dev/null
+++ b/manual/PRESENTATION_ExAdv/addshift_test.v
@@ -0,0 +1,5 @@
+module test (A, B, X, Y);
+input [7:0] A, B;
+output [7:0] X = A + B;
+output [7:0] Y = A + A;
+endmodule
diff --git a/manual/PRESENTATION_ExAdv/addshift_test.ys b/manual/PRESENTATION_ExAdv/addshift_test.ys
new file mode 100644
index 000000000..c08f1106a
--- /dev/null
+++ b/manual/PRESENTATION_ExAdv/addshift_test.ys
@@ -0,0 +1,6 @@
+read_verilog addshift_test.v
+hierarchy -check -top test
+
+techmap -map addshift_map.v;;
+
+show -prefix addshift -format pdf -notitle
diff --git a/manual/PRESENTATION_Intro.tex b/manual/PRESENTATION_Intro.tex
index 275766474..1c07928b0 100644
--- a/manual/PRESENTATION_Intro.tex
+++ b/manual/PRESENTATION_Intro.tex
@@ -359,7 +359,7 @@ as Qflow\footnote[frame]{\url{http://opencircuitdesign.com/qflow/}} for ASIC des
 	Map registers to available hardware flip-flops.
 }%
 \only<12>{
-	Map logix to available hardware gates.
+	Map logic to available hardware gates.
 }%
 \only<13>{
 	Clean up the design (just the last step of {\tt opt}).