68 lines
2.7 KiB
XML
68 lines
2.7 KiB
XML
<schema>
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<structure id="main" bits="32">
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<range start="28" end="31" name="cond"></range>
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<range start="27" end="27" name="0"></range>
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<range start="26" end="26" name="1"></range>
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<range start="25" end="25" name="I"></range>
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<range start="24" end="24" name="P">
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<description>pre / post indexing bit</description>
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<values>
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<case value="0">post, add offset after transfer</case>
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<case value="1">pre, add offset before transfer</case>
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</values>
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</range>
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<range start="23" end="23" name="U">
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<description>up / down bit</description>
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<values>
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<case value="0">down, subtract offset from base</case>
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<case value="1">up, addition offset to base</case>
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</values>
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</range>
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<range start="22" end="22" name="B">
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<description>byte / word bit</description>
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<values>
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<case value="0">transfer word quantity</case>
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<case value="1">transfer byte quantity</case>
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</values>
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</range>
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<range start="21" end="21" name="W">
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<description>write-back bit</description>
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<values>
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<case value="0">no write-back</case>
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<case value="1">write address into base</case>
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</values>
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</range>
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<range start="20" end="20" name="L">
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<description>load / store bit</description>
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<values>
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<case value="0">store to memory</case>
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<case value="1">load from memory</case>
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</values>
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</range>
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<range start="16" end="19" name="Rn">
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<description>base register</description>
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</range>
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<range start="12" end="15" name="Rd">
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<description>source / destination register</description>
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</range>
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<range start="0" end="11" name="offset" depends-on="25">
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<values>
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<case value="0" structure="immediateOffset">offset is an immediate value</case>
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<case value="1" structure="registerOffset">offset is a register</case>
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</values>
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</range>
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</structure>
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<structure id="immediateOffset" bits="12">
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<range start="0" end="11" name="12-bit immediate offset">
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<description>unsigned number</description>
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</range>
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</structure>
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<structure id="registerOffset" bits="12">
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<range start="4" end="11" name="shift">
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<description>shift applied to Rm</description>
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</range>
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<range start="0" end="3" name="Rm">
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<description>offset register</description>
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</range>
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</structure>
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</schema> |