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<!-- $Id$ -->
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<chapter>
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<chapterinfo>
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<title>JTAG Tools Internals</title>
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</chapterinfo>
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<para>
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This chapter is primarily intented for JTAG Tools hackers.
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</para>
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<sect1>
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<sect1info>
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<title>JTAG Declarations Files</title>
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</sect1info>
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<para>
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JTAG declarations files are located in directory <filename>data</filename>. The files contains
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common part specific JTAG information in parseable form, e.g. list of the JTAG commands, boundary
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scan register, list of JTAG registers, etc.
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</para>
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<para>
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Syntax of the JTAG declaration file is defined in the following subsections.
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</para>
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<sect2>
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<sect2info>
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<title>General rules</title>
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</sect2info>
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<para>
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JTAG declaration file is text file which consists of lines. Empty lines are ignored. Text after
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first <constant>#</constant> on the line to the end of line is ignored. This is useful for comments.
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All other lines are significant.
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</para>
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<para>
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Each significant line consists of tokens separated by whitespace. Whitespace could be spaces and/or tabs.
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</para>
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</sect2>
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<sect2>
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<sect2info>
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<title>Signal Definition</title>
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</sect2info>
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<para>
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Signal definition line consists of word <constant>signal</constant> followed by whitespace and signal name
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(without spaces in the name). Rest of the line should contain whitespace separated list of pins
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of the part. This list is currently not used for any purpose in JTAG Tools. It is intended for future use.
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</para>
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</sect2>
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</sect1>
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</chapter>
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