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<h1>
<a name="1051579"> </a><font color="#003366" face="Verdana, Arial, Helvetica, sans-serif">D </font>
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<h1>
<a name="1052237"> </a><font color="#003366" face="Verdana, Arial, Helvetica, sans-serif">Glossary</font>
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<p>
<a name="1052239"> </a><font size=2 face="Verdana, Arial, Helvetica, sans-serif"><b>active process</b></font>
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<dt> <a name="1052240"> </a><font size=2 face="Verdana, Arial, Helvetica, sans-serif">An active <a href="glossary.htm#1051804"><font color="#0000ff" face="Verdana, Arial, Helvetica, sans-serif"><i>process</i></font></a> in a <a href="glossary.htm#1051761"><font color="#0000ff" face="Verdana, Arial, Helvetica, sans-serif"><i>multi-tasking</i></font></a> program is one that is either <a href="glossary.htm#1051665"><font color="#0000ff" face="Verdana, Arial, Helvetica, sans-serif"><i>executing</i></font></a> or <a href="glossary.htm#1051903"><font color="#0000ff" face="Verdana, Arial, Helvetica, sans-serif"><i>waiting</i></font></a> for CPU time. It may have been <a href="glossary.htm#1051722"><font color="#0000ff" face="Verdana, Arial, Helvetica, sans-serif"><i>interrupted</i></font></a> or <a href="glossary.htm#1051894"><font color="#0000ff" face="Verdana, Arial, Helvetica, sans-serif"><i>trapped</i></font></a> or it may be waiting on a <a href="glossary.htm#1051834"><font color="#0000ff" face="Verdana, Arial, Helvetica, sans-serif"><i>scheduling queue</i></font></a>.</font>
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<a name="1051584"> </a><font size=2 face="Verdana, Arial, Helvetica, sans-serif"><b>address</b></font>
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<dt> <a name="1051585"> </a><font size=2 face="Verdana, Arial, Helvetica, sans-serif">A 32-bit integer used to identify one byte of memory or memory-mapped device. ST20 addresses are signed, that is, the address range is the same as the range of a signed 32-bit integer. A <a href="glossary.htm#1051789"><font color="#0000ff" face="Verdana, Arial, Helvetica, sans-serif"><i>pointer</i></font></a>.</font>
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<a name="1051587"> </a><font size=2 face="Verdana, Arial, Helvetica, sans-serif"><b>address space</b></font>
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<dt> <a name="1054027"> </a><font size=2 face="Verdana, Arial, Helvetica, sans-serif">The range of valid addresses.</font>
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<a name="1054029"> </a><font size=2 face="Verdana, Arial, Helvetica, sans-serif"><b>AREG</b></font>
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<dt> <a name="1054030"> </a><font size=2 face="Verdana, Arial, Helvetica, sans-serif">The 32-bit register at the top of the <a href="glossary.htm#1051650"><font color="#0000ff" face="Verdana, Arial, Helvetica, sans-serif"><i>evaluation stack</i></font></a>.</font>
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<a name="1051593"> </a><font size=2 face="Verdana, Arial, Helvetica, sans-serif"><b>arithmetic shift</b></font>
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<dt> <a name="1051594"> </a><font size=2 face="Verdana, Arial, Helvetica, sans-serif">A shift in which the sign bit is preserved. An arithmetic right shift copies the sign bit into the vacated bits.</font>
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<a name="1051596"> </a><font size=2 face="Verdana, Arial, Helvetica, sans-serif"><b>array</b></font>
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<dt> <a name="1051597"> </a><font size=2 face="Verdana, Arial, Helvetica, sans-serif">A data structure in which all the elements are of the same type and are identified by a non-negative integer subscript. A <a href="glossary.htm#1051900"><font color="#0000ff" face="Verdana, Arial, Helvetica, sans-serif"><i>vector</i></font></a>.</font>
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<a name="1051599"> </a><font size=2 face="Verdana, Arial, Helvetica, sans-serif"><b>bit</b></font>
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<dt> <a name="1051600"> </a><font size=2 face="Verdana, Arial, Helvetica, sans-serif">A binary digit, which can take the value 1 (also called <a href="glossary.htm#1051843"><font color="#0000ff" face="Verdana, Arial, Helvetica, sans-serif"><i>set</i></font></a> or true) or 0 (also called <a href="glossary.htm#1051620"><font color="#0000ff" face="Verdana, Arial, Helvetica, sans-serif"><i>clear</i></font></a> or false). </font>
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<a name="1051602"> </a><font size=2 face="Verdana, Arial, Helvetica, sans-serif"><b>bitwise operation</b></font>
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<dt> <a name="1051603"> </a><font size=2 face="Verdana, Arial, Helvetica, sans-serif">An operation on multi-bit values which treats each bit as a true (if <a href="glossary.htm#1051843"><font color="#0000ff" face="Verdana, Arial, Helvetica, sans-serif"><i>set</i></font></a>) or false (if <a href="glossary.htm#1051620"><font color="#0000ff" face="Verdana, Arial, Helvetica, sans-serif"><i>clear</i></font></a>). </font>
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<a name="1051605"> </a><font size=2 face="Verdana, Arial, Helvetica, sans-serif"><b>Boolean</b></font>
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<dt> <a name="1051606"> </a><font size=2 face="Verdana, Arial, Helvetica, sans-serif">Logic values and calculations using AND, OR, and NOT. A multi-bit value is treated as Boolean if it represents a single true of false value, as opposed to <a href="glossary.htm#1051602"><font color="#0000ff" face="Verdana, Arial, Helvetica, sans-serif"><i>bitwise operation</i></font></a>.</font>
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<a name="1051608"> </a><font size=2 face="Verdana, Arial, Helvetica, sans-serif"><b>BREG</b></font>
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<dt> <a name="1051609"> </a><font size=2 face="Verdana, Arial, Helvetica, sans-serif">The 32-bit register in the middle of the <a href="glossary.htm#1051650"><font color="#0000ff" face="Verdana, Arial, Helvetica, sans-serif"><i>evaluation stack</i></font></a>.</font>
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<a name="1051611"> </a><font size=2 face="Verdana, Arial, Helvetica, sans-serif"><b>byte</b></font>
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<dt> <a name="1051612"> </a><font size=2 face="Verdana, Arial, Helvetica, sans-serif">An 8-bit value or location.</font>
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<a name="1051614"> </a><font size=2 face="Verdana, Arial, Helvetica, sans-serif"><b>cache</b></font>
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<dt> <a name="1051615"> </a><font size=2 face="Verdana, Arial, Helvetica, sans-serif">Fast memory used to temporarily hold copies of slow memory locations in order to provide high performance memory access with slow memory.</font>
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<a name="1051617"> </a><font size=2 face="Verdana, Arial, Helvetica, sans-serif"><b>channel</b></font>
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<dt> <a name="1051618"> </a><font size=2 face="Verdana, Arial, Helvetica, sans-serif">A synchronous, one-way, point-to-point, unbuffered communications mechanism. </font>
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<a name="1051620"> </a><font size=2 face="Verdana, Arial, Helvetica, sans-serif"><b>clear</b></font>
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<dt> <a name="1051621"> </a><font size=2 face="Verdana, Arial, Helvetica, sans-serif">A bit is clear if it has the value 0.</font>
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<a name="1051623"> </a><font size=2 face="Verdana, Arial, Helvetica, sans-serif"><b>CREG</b></font>
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<dt> <a name="1051624"> </a><font size=2 face="Verdana, Arial, Helvetica, sans-serif">The 32-bit register at the bottom of the <a href="glossary.htm#1051650"><font color="#0000ff" face="Verdana, Arial, Helvetica, sans-serif"><i>evaluation stack</i></font></a>.</font>
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<a name="1051627"> </a><font size=2 face="Verdana, Arial, Helvetica, sans-serif"><b>current process</b></font>
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<dt> <a name="1051628"> </a><font size=2 face="Verdana, Arial, Helvetica, sans-serif">The process being either being executed by the CPU, interrupted or trapped.</font>
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<a name="1055311"> </a><font size=2 face="Verdana, Arial, Helvetica, sans-serif"><b>DCU</b></font>
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<dt> <a name="1055315"> </a><font size=2 face="Verdana, Arial, Helvetica, sans-serif">See <a href="glossary.htm#1053596"><font color="#0000ff" face="Verdana, Arial, Helvetica, sans-serif"><i>Diagnostic Controller Unit</i></font></a>.</font>
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<a name="1055318"> </a><font size=2 face="Verdana, Arial, Helvetica, sans-serif"><b>descriptor</b></font>
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<dt> <a name="1054118"> </a><font size=2 face="Verdana, Arial, Helvetica, sans-serif">Identifier of a <a href="glossary.htm#1051804"><font color="#0000ff" face="Verdana, Arial, Helvetica, sans-serif"><i>process</i></font></a> or <a href="glossary.htm#1051653"><font color="#0000ff" face="Verdana, Arial, Helvetica, sans-serif"><i>exception</i></font></a>.</font>
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