diff options
Diffstat (limited to '')
| -rw-r--r-- | tex/samples.tex | 2 | ||||
| -rw-r--r-- | tex/testbench.tex | 4 | ||||
| -rw-r--r-- | tex/vhdl.tex | 2 |
3 files changed, 5 insertions, 3 deletions
diff --git a/tex/samples.tex b/tex/samples.tex index 0e335d2..c272e05 100644 --- a/tex/samples.tex +++ b/tex/samples.tex @@ -32,7 +32,7 @@ end entity `\reqph{name}`_tb; architecture tb of `\reqph{name}`_tb is -- simulator settings constant freq : natural := `\reqph{frequency}`; - constant time : time := 1 sec / freq; + constant T : time := 1 sec / freq; -- component of DUT component `\reqph{name}` is diff --git a/tex/testbench.tex b/tex/testbench.tex index 71496f2..dc52453 100644 --- a/tex/testbench.tex +++ b/tex/testbench.tex @@ -3,6 +3,8 @@ To simulate a digial circuit it is possible to write test benches using VHDL. The code in this section may no longer be synthetisable, and is usually written by a \emph{test designer}. +%% TODO: Talk about DUT, with an image? + \subsection{Simulator} VHDL simulates digital systems using \emph{delta cycles}. @@ -106,7 +108,7 @@ Assertions are used write tests to check that a signal is in the correct state. \end{lstlisting} The \vhdl{report} and \vhdl{severity} are optional but strongly advised. The severity can take one of 4 values: \vhdl{note}, \vhdl{warning}, \vhdl{error}, -\vhdl{failure}. Simulations can be configured to stop in when an error of the +\vhdl{failure}. Simulations can be configured to stop when an error of the desired severity occurrs. An example: \begin{lstlisting}[language=vhdl] assert (tb_y = '0') report "error at vector 11" severity error; diff --git a/tex/vhdl.tex b/tex/vhdl.tex index 06dabd0..38afe24 100644 --- a/tex/vhdl.tex +++ b/tex/vhdl.tex @@ -664,7 +664,7 @@ generic( `\reqph{param name}` : `\reqph{type}` := `\reqph{initial value}` ); \end{lstlisting} -that has affects at \emph{synthesization time}. +that has effect at \emph{synthesization time}. \subsubsection{Generic entity and declaration} Entities are parametrized as follows. |