The boundary scan adopts the address, data, control register together with instruction register to access relevant space, utilizes original circuit of core of DSP, decreases the cost of hardware; 在边界扫描链设计中,采用了自定义的控制、数据、地址寄存器与指令寄存器相结合的访问ROM和RAM等相应空间方法,与原有的地址译码电路相结合,减少了硬件的开销;