Marcelo Roberto Jimenez wrote an assembler/disassembler for XSVF, he writes:
As a sequence of my last project, the JTAG/XSVF library for Arduino, I felt I needed a XSVF assembler and disassembler, so that I could hack JTAG a little bit. I found that XSVF is very convenient, much more than SVF when you are dealing with a single component in the JTAG chain. I also found out that the XSVF files produced by programmers are very inefficient and full of unnecessary stuf. It would be great if I could write my own XSVF files.
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Code is on github.
Details at Marcelo’s EE & CS blog.