FIFO_PORTS_REG_W
if (bus_space_read_2(bst, bsh, FIFO_PORTS_REG_W) & FIFO_REMPTY)
packetno = bus_space_read_2(bst, bsh, FIFO_PORTS_REG_W);
packetno = bus_space_read_2(bst, bsh, FIFO_PORTS_REG_W) &
packetno = bus_space_read_2(bst, bsh, FIFO_PORTS_REG_W);