In system field upgrades to an XC9500 CPLD are traditionallydone by field engineers using a portable PC. The PCwill have either the EZTag or JTAG Programmer Software,an XChecker or JTAG Parallel Cable with flying wires toconnect to the target application, and an updated JEDECprogramming file. Once all the cables, software, and filesare in place, the engineer begins the field upgrade. Thisapplication note goes one step further in not requiring thefield engineer to be present where the upgrade occurs. Itwill require advanced planning and building circuitry intothe embedded system in advance, but that should beexpected.
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