mirror of https://github.com/lawrancej/logisim.git
Documentation changes for 2.6.1.
git-svn-id: https://circuit.svn.sourceforge.net/svnroot/circuit/trunk@89 70edf91d-0b9e-4248-82e7-2488d7716404
This commit is contained in:
Carl Burch
parent
cd4ec49730
commit
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@ -131,6 +131,7 @@
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<tocitem target="arith_comparator" text="Comparator" />
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<tocitem target="arith_shifter" text="Shifter" />
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<tocitem target="arith_bitadder" text="Bit Adder" />
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<tocitem target="arith_bitfinder" text="Bit Finder" />
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</tocitem>
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<tocitem target="mem" text="Memory library">
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<tocitem target="mem_flipflops" text="D/T/J-K/S-R Flip-Flop" />
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@ -40,8 +40,8 @@ ff
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<p>The first line identifies the file format used (currently, there is only
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one file format recognized). Subsequent values list the values in
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hexadecimal, starting from address 0; you can place several such
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values on the same line. Logisim will assume that any
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values unlisted in the file are zero.</p>
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values on the same line. If there are more memory locations that are identified
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in the file, Logisim will load 0 into the other memory locations.</p>
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<p>The image file can use run-length encoding; for example, rather than
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list the value <tt>00</tt> sixteen times in a row, the file can include
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@ -50,6 +50,9 @@ than the number of repetitions is written in base 10.
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Files produced by Logisim will use run-length encoding for runs of
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at least four values.</p>
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<p>You can place comments into the file by using the '#' symbol: All characters
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in the line starting from the '#' symbol will be ignored by Logisim.</p>
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<p><strong>Next:</strong> <a href="hex.html">Hex editor</a>.</p>
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</body>
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Binary file not shown.
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@ -0,0 +1,106 @@
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<html>
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<head>
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<title>Bit Finder</title>
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</head>
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<body bgcolor="FFFFFF">
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<h1><img align="center" height="32" width="32" src="../../icons/bitfindr.gif">
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<em>Bit Finder</em></h1>
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<p><table>
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<tr><td><strong>Library:</strong></td>
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<td><a href="index.html">Arithmetic</a></td></tr>
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<tr><td><strong>Introduced:</strong></td>
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<td>2.6.1</td></tr>
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<tr><td valign="top"><strong>Appearance:</strong></td>
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<td valign="top"><img src="../images/bitfindr.png"></td></tr>
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</table></p>
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<h2>Behavior</h2>
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<p>The component takes a multi-bit input and determines the the index of a bit,
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where the index is computed by counting from 0 as the lowest-order bit.
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Exactly which index it computes depends on the Type attribute, as illustrated
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by the examples in the below table for the 8-bit sample input 11010100.</p>
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<blockquote><table><thead>
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<tr><th>Type</th><th>Output for 11010100</th></td></tr>
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</thead><tbody>
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<tr><td>Lowest-order 1</td><td align="center">2</td></tr>
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<tr><td>Highest-order 1</td><td align="center">7</td></tr>
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<tr><td>Lowest-order 0</td><td align="center">0</td></tr>
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<tr><td>Highest-order 0</td><td align="center">5</td></tr>
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</body></table></blockquote>
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<p>For the lowest-order 1, the output is 2 because if you index the bits
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starting from 0 for the lowest-order bit, the first 1 you will find is
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at index 2. (The bits at indices 0 and 1 are both 0.)
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For the highest-order 1, the output is 7 because the topmost 1 bit is at index 7
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(again counting from the lowest-order bit as 0).</p>
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<p>The component's output on the south edge indicates whether the desired bit
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was found at all. In the above examples involving the input 11010100,
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the south output is 1 in all cases.
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But if the input were 00000000 and the component is to find the
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lowest-order 1, then the south output would be 0 — and the output on the
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west edge would be 0 as well.</p>
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<p>If while searching for the desired value, a value that is neither 0 or 1 is
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found (the bit could be floating or an error value),
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then both outputs will consist entirely of error bits.
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Note that this occurs only if the problematic bit is encountered before finding
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the desired bit: For the input x1010100, the output would still be 2 if
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the lowest-order 1 is desired; but we would get error values if the component's
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type indicates to search for the highest-order 1 or the highest-order 0, since
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there is an erroneous bit in a higher-order bit than either the highest-order 0
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or the highest-order 1.</p>
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<h2>Pins</h2>
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<dl>
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<dt>West edge (input, bit width matches Data Bits attribute)</dt>
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<dd>The multibit input that is to be searched for the desired bit.</dd>
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<dt>East edge (output, bit width computed as described below)</dt>
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<dd>The index of the desired bit, counting from 0 for the lowest-order bit.
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The bit width is the
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minimum number of bits to store the maximum possible index, which is one
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less than the value of the Data Bits attribute.</dd>
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<dt>South edge (output, bit width 1)</dt>
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<dd>1 if the desired bit is found, 0 if all input bits are the inverse of the
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desired bit, and the error value if a non-0, non-1 value is found before the
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desired bit.</dd>
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</dl>
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<h2>Attributes</h2>
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<p>When the component is selected or being added,
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Alt-0 through Alt-9 alter its <q>Data Bits</q> attribute.</p>
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<dl>
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<dt>Data Bits</dt>
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<dd>The bit width of the input.</dd>
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<dt>Type</dt>
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<dd>Indicates which bit to search for — the lowest-order 0,
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the highest-order 0, the lowest-order 1, or the highest-order 1.</dd>
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</dl>
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<h2>Poke Tool Behavior</h2>
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<p>None.</p>
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<h2>Text Tool Behavior</h2>
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<p>None.</p>
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<p><a href="../index.html">Back to <em>Library Reference</em></a></p>
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</body>
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</html>
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@ -28,6 +28,8 @@ two's-complement values.</p>
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<td><a href="shifter.html">Shifter</a></td></tr>
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<tr><td align="right"><a href="bitadder.html"><img border="0" src="../../icons/bitadder.gif"></a></td>
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<td><a href="bitadder.html">Bit Adder</a></td></tr>
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<tr><td align="right"><a href="bitfinder.html"><img border="0" src="../../icons/bitfindr.gif"></a></td>
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<td><a href="bitfinder.html">Bit Finder</a></td></tr>
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</table>
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<p><a href="../index.html">Back to <em>Library Reference</em></a></p>
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@ -148,6 +148,12 @@ beyond what the shape naturally accommodates.</dd>
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<dd>Determines how many pins to have for the component on its west
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side.</dd>
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<dt>Label</dt>
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<dd>The text within the label associated with the gate.</dd>
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<dt>Label Font</dt>
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<dd>The font with which to render the label.</dd>
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<dt>Negate <var>x</var></dt>
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<dd>If <q>yes</q>, the input is negated before it is fed into the gate.
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The inputs are counted top-down if the facing is east or west,
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@ -161,7 +167,7 @@ and they are counted left-to-right if the facing is north or south.</dd>
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<h2>Text Tool Behavior</h2>
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<p>None.</p>
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<p>Allows the label associated with the gate to be edited.</p>
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<p><a href="../index.html">Back to <em>Library Reference</em></a></p>
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@ -64,6 +64,12 @@ and the arrow keys alter its <q>Facing</q> attribute.</p>
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<dt>Data Bits</dt>
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<dd>The bit width of the component's inputs and outputs.</dd>
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<dt>Label</dt>
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<dd>The text within the label associated with the gate.</dd>
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<dt>Label Font</dt>
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<dd>The font with which to render the label.</dd>
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</dl>
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<h2>Poke Tool Behavior</h2>
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@ -72,7 +78,7 @@ and the arrow keys alter its <q>Facing</q> attribute.</p>
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<h2>Text Tool Behavior</h2>
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<p>None.</p>
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<p>Allows the label associated with the gate to be edited.</p>
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<p><a href="../index.html">Back to <em>Library Reference</em></a></p>
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@ -89,6 +89,12 @@ from the input: If the component faces east and is <q>right-handed,</q>
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the control line is to the south; but if it is <q>left-handed,</q>
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the control line is to the north.</dd>
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<dt>Label</dt>
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<dd>The text within the label associated with the gate.</dd>
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<dt>Label Font</dt>
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<dd>The font with which to render the label.</dd>
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</dl>
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<h2>Poke Tool Behavior</h2>
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@ -97,7 +103,7 @@ the control line is to the north.</dd>
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<h2>Text Tool Behavior</h2>
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<p>None.</p>
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<p>Allows the label associated with the gate to be edited.</p>
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<p><a href="../index.html">Back to <em>Library Reference</em></a></p>
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@ -64,6 +64,12 @@ and the arrow keys alter its <q>Facing</q> attribute.</p>
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<dd>Determines whether to draw a larger or a smaller version of the
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component.</dd>
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<dt>Label</dt>
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<dd>The text within the label associated with the gate.</dd>
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<dt>Label Font</dt>
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<dd>The font with which to render the label.</dd>
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</dl>
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<h2>Poke Tool Behavior</h2>
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@ -72,7 +78,7 @@ component.</dd>
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<h2>Text Tool Behavior</h2>
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<p>None.</p>
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<p>Allows the label associated with the gate to be edited.</p>
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<p><a href="../index.html">Back to <em>Library Reference</em></a></p>
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@ -141,6 +141,12 @@ requested.</dd>
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<dd>Determines how many pins to have for the component on its west
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side.</dd>
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<dt>Label</dt>
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<dd>The text within the label associated with the gate.</dd>
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<dt>Label Font</dt>
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<dd>The font with which to render the label.</dd>
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<dt>Multiple-Input Behavior (XOR and XNOR only)</dt>
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<dd>When three or more inputs are provided, the XOR/XNOR gate's output will
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either be based on whether exactly one input is 1 (the default) or an odd number
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@ -154,7 +160,7 @@ of inputs are 1.</dd>
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<h2>Text Tool Behavior</h2>
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<p>None.</p>
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<p>Allows the label associated with the gate to be edited.</p>
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<p><a href="../index.html">Back to <em>Library Reference</em></a></p>
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Binary file not shown.
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After Width: | Height: | Size: 408 B |
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@ -113,6 +113,8 @@ documented in this reference material.</p>
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<td><a href="arith/shifter.html">Shifter</a></td></tr>
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<tr><td align="right"><a href="arith/bitadder.html"><img border="0" src="../icons/bitadder.gif"></a></td>
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<td><a href="arith/bitadder.html">Bit Adder</a></td></tr>
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<tr><td align="right"><a href="arith/bitfinder.html"><img border="0" src="../icons/bitfindr.gif"></a></td>
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<td><a href="arith/bitfinder.html">Bit Finder</a></td></tr>
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<tr><td colspan="2"><br><font size="+1"><b><a href="mem/index.html">Memory library</a></b></font></td></tr>
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<tr><td align="right"><a href="mem/flipflops.html" style="text-decoration: none">
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@ -61,10 +61,17 @@ TIL321.)</p>
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<dl>
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<dt>Color</dt>
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<dt>On Color</dt>
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<dd>The color with which to draw the display segments and decimal point when
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they are on.</dd>
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<dt>Off Color</dt>
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<dd>The color with which to draw the display segments and decimal point when
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they are off.</dd>
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<dt>Background</dt>
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<dd>The color with which to draw the display's background (transparent by default).</dd>
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<dt>Active On High?</dt>
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<dd>If <q>yes</q>, then the segments light when the corresponding input is 1.
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If <q>no</q>, they light when the corresponding input is 0.</dd>
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@ -43,10 +43,17 @@ remains off.</dd>
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<dl>
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<dt>Color</dt>
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<dt>On Color</dt>
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<dd>The color with which to draw the display segments and decimal point when
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they are on.</dd>
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<dt>Off Color</dt>
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<dd>The color with which to draw the display segments and decimal point when
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they are off.</dd>
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<dt>Background</dt>
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<dd>The color with which to draw the display's background (transparent by default).</dd>
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</dl>
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<h2>Poke Tool Behavior</h2>
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If it is <q>Falling Edge,</q>, then this happens when the
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clock input changes from 1 to 0.</dd>
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<dt>Color</dt>
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<dd>The color with which to draw the text appearing in the terminal.</dd>
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<dt>Background</dt>
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<dd>The color with which to draw the terminal's background.</dd>
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</dl>
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<h2>Poke Tool Behavior</h2>
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@ -115,6 +115,7 @@
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<mapID target="arith_comparator" url="libs/arith/comparator.html" />
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<mapID target="arith_shifter" url="libs/arith/shifter.html" />
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<mapID target="arith_bitadder" url="libs/arith/bitadder.html" />
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<mapID target="arith_bitfinder" url="libs/arith/bitfinder.html" />
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<mapID target="mem" url="libs/mem/index.html" />
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<mapID target="mem_flipflops" url="libs/mem/flipflops.html" />
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<mapID target="mem_register" url="libs/mem/register.html" />
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@ -0,0 +1,33 @@
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LOGISIM 2.6.1 ADDS GERMAN, ENHANCES LIBRARIES
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Logisim, a graphical design and simulation tool for logic circuits, is now at version 2.6.1. The biggest feature in this release is a new German translation composed by Uwe Zimmerman of Uppsala University. The release also repairs some minor bugs in the recently released 2.6.0.
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Besides the German translation, the release includes several minor enhancements to the library components. In the Gates library, you can now associate a label with any gate added into the circuit. In the Arithmetic library, a new Bit Finder component has been added, and all existing components have been enhanced so that a tool tip will be displayed when the mouse hovers over an input or output. In the I/O library, several components provide more color configuration options.
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Educational institutions around the world use Logisim as an aid to teaching about digital logic and computer architecture. As a Java application, Logisim can run on most major operating systems. Read more about Logisim at http://www.cburch.com/logisim/, and download it from SourceForge.net at http://sourceforge.net/projects/circuit/.
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CHANGE LOG
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Feature: A German translation of the GUI elements is now included.
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Feature: Added a Label and Label Font attribute for all components in the Gates library except Constant.
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Feature: Added the Bit Finder component into the Arithmetic library.
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Feature: Added tool tips for each input and output of all Arithmetic components.
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Feature: Memory image files generated by a text editor or other file can include comments: Logisim ignores the '#' character and the following characters on that line.
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Feature: Added Off Color and Background attributes for the I/O library's Seven-Segment Display and Hex Digit Display.
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Feature: Added Color and Background attributes for the I/O library's TTY component.
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Feature: Enhanced the splash screen and "About" dialog to give credit to other team members.
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Bug fix: Circuit statistics were not computed recursively as intended (it was done correctly in 2.5.1).
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Bug fix: The Bit Adder's output bit width was one bit too small when the maximum possible count was a power of 2.
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Bug fix: With a multiplexer/demultiplexer/decoder selected, pressing 1 through 4 alters the number of select bits, but 5 does not work properly.
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Bug fix: If you select a wire and drag one endpoint in the same direction the wire is facing, then it shows just a fragment of the resulting longer wire being selected.
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