Advanced Micro Devices Inc.'s Japan unit said Thursday that it has filed two lawsuits against Intel Corp.'s Japanese unit for $55 million in damages.
Under the lawsuits, AMD Japan accuses Intel of violating Japan's antitrust laws, and says Intel's trading practices have caused damage to AMD.
In March, the Fair Trade Commission ruled that Intel's Japan unit was violating antitrust laws in the methods it used to sell its computer chips. The government antimonopoly body ordered the company to stop those practices.
AMD earlier this week filed a broad antitrust suit against Intel in the United States, accusing its rival of using illegal inducements and coercion to dissuade companies from buying AMD's computer chips.
That lawsuit alleges that Intel has engaged in a "relentless" global campaign to maintain a monopoly over microprocessors, the chips used in most computers.
Intel, the world's largest chip maker, has denied wrongdoing.