struct ppci { unsigned int data; /* Output register for External bus */ unsigned int led; /* LED register */ unsigned int sw; /* Switch Register */ unsigned int address; /* Transfer address register */ unsigned int length; /* Transfer cout register */ unsigned int mode; /* Mode register */ unsigned int status; /* Status register */ unsigned int dummy; /* dummy */ unsigned int retlen; /* Actual transfer count */ unsigned int fifolen; /* Size of data in FIFO */ };It reads the information into the buffer starting at a ppci.