实用的程序代码，希望对大家有用，已经调试通过

实用的程序代码，希望对大家有用，已经调试通过-Practical program code, in the hope that useful to everybody, has debugging through

NULL_cclk_xc4vfx100ff1152.bit
NULL_cclk_xc4vfx100ff1517.bit
NULL_cclk_xc4vfx140ff1517.bit
NULL_cclk_xc4vfx20ff672.bit
NULL_cclk_xc4vfx40ff1152.bit
NULL_cclk_xc4vfx40ff672.bit
NULL_cclk_xc4vfx60ff1152.bit
NULL_cclk_xc4vfx60ff672.bit
NULL_jtagclk_xc4vfx100ff1152.bit
NULL_jtagclk_xc4vfx100ff1517.bit
NULL_jtagclk_xc4vfx140ff1517.bit
NULL_jtagclk_xc4vfx20ff672.bit
NULL_jtagclk_xc4vfx40ff1152.bit
NULL_jtagclk_xc4vfx40ff672.bit
NULL_jtagclk_xc4vfx60ff1152.bit
NULL_jtagclk_xc4vfx60ff672.bit
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