A Chinese chip company, MetaX Integrated Circuits, surged over 700 percent in its Shanghai debut after the firm raised nearly $600 million at listing, following earlier broad declines across Asian markets.The rally came as investors digested stronger-than-expected Japanese export data showing a 6.1 percent year-on-year rise and mixed moves across regional indices, with the Nikkei and Topix trading lower while Shenzhen and Kospi showed modest gains.