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authorWerner Almesberger <werner@almesberger.net>2014-08-27 05:01:15 -0300
committerWerner Almesberger <werner@almesberger.net>2014-08-27 05:01:15 -0300
commit447df9d2eb496c660d18f89c66ef82131ce6e81d (patch)
tree1143574cc961fd5f424d87756e91441af3beb301 /ir
parent9bd5e96b5fa362374d2197d50fa9330165e50887 (diff)
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ir/ir.tex: define what "active" means in terms of light
Diffstat (limited to 'ir')
-rw-r--r--ir/ir.tex10
1 files changed, 6 insertions, 4 deletions
diff --git a/ir/ir.tex b/ir/ir.tex
index 6535653..1e2029b 100644
--- a/ir/ir.tex
+++ b/ir/ir.tex
@@ -14,7 +14,7 @@ Werner Almesberger%
\footnote{Specification details and illustrations.}
%~\url{<werner@almesberger.net>}
}
-\date{August 26, 2014}
+\date{August 27, 2014}
\def\TODO{{\bf TO DO}}
\def\todo#1{\begin{center}{\bf TO DO:} #1\hfill~\end{center}}
@@ -456,9 +456,11 @@ RX & \unspec & \inpeit & \inpeit & \inpneg & \inpneg \\
\end{tab}
%
{\outany} indicates an output from
-the CPU, {\inpany} an input. An active-high signal is marked with
-{\posact} while an active-low signal is marked with {\negact}. A
-signal where the CPU can be configured for either polarity it marked
+the CPU, {\inpany} an input. An active-high signal (i.e., light is emitted
+or received on the signal being ``1'') is marked with
+{\posact} while an active-low (light on ''0'') signal is marked with
+{\negact}.
+A signal where the CPU can be configured for either polarity is marked
with {\eitact}. An unused signal is marked with {\unspec}.
% -----------------------------------------------------------------------------