Xsight Labs said it has closed a funding round of more than $300 million at a $2.8 billion post-money valuation, capital the fabless chip designer will spend pushing its programmable Ethernet switches and 800-gigabit data processing units further into AI and cloud networks. Fidelity Management & Research Company led the round, with Intel Capital , Battery Ventures and Valor Equity Partners among the participating investors. Founded in 2017 and headquartered in Tel Aviv with engineering and…