SVF is an file format that is used to describe JTAG chain operations. This script converts SVF ascii files to XSVF binary file format. No need to install Xilinx iMPACT software.

svf2xsvf.py

# converts SVF ascii files to XSVF binary file format
# usage: python svf2xsvf.py source.svf dest.xsvf

import sys

data = ["XCOMPLETE","XTDOMASK","XSIR","XSDR","XRUNTEST","","","XREPEAT",\
        "XSDRSIZE","XSDRTDO","XSETSDRMASKS","XSDRINC","XSDRB","XSDRC","XSDRE",\
        "XSDRTDOB","XSDRTDOC","XSDRTDOE","XSTATE","XENDIR","XENDDR",\
        "XSIR2","XCOMMENT","XWAIT"]

def name2hex(name):
    for idx, n in enumerate(data):
        if(n == name): return idx

if(len(sys.argv) == 3):

    hexdata = bytearray()

    with open(sys.argv[1], "r") as f:
        for raw in f:
            if(";" in raw):
                line = raw[:raw.find(";")]
            elif("/" in raw):
                line = raw[:raw.find("/")]
            elif("!" in raw):
                line = raw[:raw.find("!")]
            else:
                line = raw.rstrip("\r\n")
            # take first word as a command
            if(" " in line):
                hexdata.append(name2hex(line[:line.find(" ")]))
            else:
                hexdata.append(name2hex(line))
                if(name2hex(line) == 0x04): #XRUNTEST needs additional parameters
                    hexdata.append(0)
                    hexdata.append(0)
                    hexdata.append(0)
                    hexdata.append(0)
                continue # continue from next iteration
            # take next characters as a parameters
            params = line.split(" ")
            for idx, p in enumerate(params):
                if(idx > 0): hexdata.append(int(p,16))

    with open(sys.argv[2], "wb") as f:
        f.write(hexdata)