AP-720 Programming Flash Memory through the Intel386(TM) EX Embedded Microprocessor JTAG Port

This application note describes a simple method for programming data into flash memory using a standard JTAG (Joint Test Action Group) port specified by IEEE 1149.1. The JTAG device used in this case is the Intel386 TM EX embedded processor; however, the scope of this application is easily extended to many other JTAG compliant devices. Using the features of the Intel386 EX embedded processor in conjunction with a simple hardware interface, a standard set of software routines can be used to program data into flash memory. By controlling the CPUs JTAG port, these routines manage the data that is programmed into flash memory as well as the processors control lines.

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