Star-2 Scanning Format Research Based on IEEE 1149.7 Standard

On account of the integration of modern test system is becoming more and more complex, the IEEE 1149.7 Standard puts forwards the test method of star-2 scan topology to meet the needs of using fewer pins to achieve boundary scan at present. On the basis of on the IEEE 1149.7 standard and in-depth study on the standard, the platform of Quartus II was used to design the star-2 scanning controller, which is validated by simulation. The results indicate that the test signal can be generated by the controller, which can meet the provisions of star-2 scanning signal of IEEE 1149.7 standard and the specified Mscan format and Oscan format.