This chapter is primarily intented for JTAG Tools hackers. JTAG declarations files are located in directory data. The files contains common part specific JTAG informaions in parseble form, e.g. list of the JTAG commands, boundary scan register, list of JTAG registers, etc. Syntax of the JTAG declaration file is defined in following subsections. JTAG declaration file is text file which consist of lines. Empty lines are ignored. Text after first # on the line to the end of line is ignored. This is useful for comments. All other lines are significant. Each significant line consists of tokens separated by whitespace. Whitespace could be spaces and/or tabs. Signal definition line consist of word pin followed by whitespace and signal name (without spaces in the name). Rest of the line should contain whitespace separated list of pins of the part. This list is is currently not used for any purpose in JTAG Tools.