Updated from 3:02 p.m. ET A federal judge has issued a memorandum that basically limits some points of Rambus' ( RMBS ) patent infringement suit against Infineon Technologies ( IFX ), according to Dow Jones. The pretrial ruling was released a day after Rambus' stock dove 32% after Electronic News Online reported that a ruling favoring Infineon had been made but hadn't been written. The stock closed Friday down $8.29, or 34%, to $15.80. In a statement Friday, Rambus said, "Based on this interpretation, Rambus maintains its allegation that Infineon has infringed these four patents. Rambus is prepared to protect its intellectual property from those who infringe and looks forward to presenting its case to the jury." Rambus is suing Infineon over patents that Rambus says it holds on two types of DRAM, or dynamic random access memory, called synchronous DRAM, or SDRAM, and double data rate DRAM, or DDR.