FIFO_PORTS_REG_W
packet_number = inw(BASE + FIFO_PORTS_REG_W);
if (inw(BASE + FIFO_PORTS_REG_W) & FIFO_REMPTY)
packet_number = inw(BASE + FIFO_PORTS_REG_W);
packet_no = inw(BASE + FIFO_PORTS_REG_W);
packet_number = inw(BASE + FIFO_PORTS_REG_W);