DATA_REG_W
dr = bus_space_read_4(bst, bsh, DATA_REG_W);
bus_space_read_multi_stream_2(bst, bsh, DATA_REG_W,
bus_space_read_multi_stream_4(bst, bsh, DATA_REG_W,
bus_space_read_stream_4(bst, bsh, DATA_REG_W);
bus_space_write_2(bst, bsh, DATA_REG_W, 0);
bus_space_write_2(bst, bsh, DATA_REG_W, (length + 6) & 0x7ff);
bus_space_write_2(bst, bsh, DATA_REG_W, oddbyte);
bus_space_write_2(bst, bsh, DATA_REG_W, 0);
bus_space_write_2(bst, bsh, DATA_REG_W,
bus_space_write_2(bst, bsh, DATA_REG_W, dbuf);
DATA_REG_W, (uint16_t *)p, len >> 1);
tx_status = bus_space_read_2(bst, bsh, DATA_REG_W);