RME9652_buf_pos
#define RME9652_REV15_buf_pos(x) ((((x)&0xE0000000)>>26)|((x)&RME9652_buf_pos))
(rme9652->period_bytes * 2 - 1) & RME9652_buf_pos;
offset = status & RME9652_buf_pos;