A ROM is embedded within an array of DRAM cells by changing a single mask in a DRAM fabrication process to selectively short circuit the DRAM capacitor lower electrode to its own wordline to create a read-only "1" or to the wordline of an adjacent cell to create a read only "0". ...http://www.google.de/patents/US20010021122?utm_source=gb-gplus-sharePatent US20010021122 - ROM-embedded-DRAM
