A design of mixed-signal test controller based on boundary scan

With the rapid development of microelectronics, it is difficult to test complicated integrated circuit for the traditional test methods. For this circs, JTAG puts forward a new kind of circuit test method - boundary scan technology. According to the IEEE1149.4, a boundary scan controller is designed by ATmega128 MCU and SN74ACT8990. Experiments show that the test controller can locate faults rapidly. The design of the boundary scan controller provides a basis for the further research of mixed electronic system BIT.