The eastern German state of Saxony, where Qimonda is one of the biggest employers, will provide €150 millions ($210 million) to the ailing company.
Infineon will contribute a loan of €75 million and a Portuguese state investment bank will give €100 million, Qimonda said in a statement. The company said it also expects to receive a further €280 million in loan guarantees from the German federal government and the regional Saxony government.
"The negotiations on the €150 million loan (from Saxony) are already well-advanced," Qimonda said, adding that it hopes to bolster its research and production facility in Porto, Portugal.
The government in Saxony is expected to grant the €150-million loan on Tuesday and has called for Infineon to match its contribution. But Infineon, which owns 77.5 percent of Qimonda, says it is not financially secure enough to supply more funds.
"We have reached a breakthrough today" necessary to start saving Qimonda, said Saxony's economy minister Thomas Jurk, who also thanked his Portuguese counterpart for the quick contribution from his country's state bank.
Earlier this month, Infineon issued a gloomy report for itself and its loss-making memory-chip unit Qimonda, after posting an annual loss of €3 billion ($3.8 billion).
Qimonda had been searching desperately for an investor and asked for public aid.