The licence covers DRAM memory controllers for SDR, DDR, DDR2, DDR3 and other unnamed memory types.
Toshiba was one of the first companies to accept that Rambus owned valid patents on memory technology.
Other licensees include Renesas, AMD, Sony, Panasonic, Samsung, Elpida, Intel and others. Rambus has a reputation for fierce litigation and has conducted many lengthy court cases to establish that it does own a heap of memory patents.
News of the licence agreement caused its shares to rise on NASDAQ, closing yesterday at $20.25. Late last year, the US International Trade Commission said it would investigate 34 companies after Rambus filed a lawsuit against LSI, MediaTek, ST Micro, Broadcom, Freescale and Nvidia, related to PCI Express and memory technology patents.