Semiconductor integrated circuit device and process for manufacturing the same
Patent 5270944 Issued on December 14, 1993. Estimated Expiration Date: 
August 14, 2012. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.
August 14, 2012. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent ReferencesMethod for fabricating a 1-chip microcomputer Asic emulator Patent #: 4901259 InventorsAssigneeApplicationNo. 929511 filed on 08/14/1992US Classes:716/3, Translation (e.g., conversion, equivalence)257/E21.662, Read-only memory structures (ROM), i.e., nonvolatile memory structures (EPO)257/E21.689, Including different types of peripheral FETs (EPO)257/E27.081, Including field-effect component (EPO)257/E27.102Read-only memory, ROM, structure (EPO)ExaminersPrimary: Trans, Vincent N.Attorney, Agent or FirmInternational ClassesG06F 015/60H01L 027/00 Foreign Application Priority Data1988-06-09 JPAbstractA method of fabrication comprising forming a semiconductor integrated circuit device LSI which has a microcomputer CPU furnished with an EPROM, determining a program for controlling the microcomputer CPU and to be set in the EPROM (performing an initial evaluation) while information is being written into and erased from the EPROM built in the semiconductor integrated circuit device LSI, and thereafter forming a semiconductor integrated circuit device LSI in which the EPROM of the first-mentioned semiconductor integrated circuit device LSI is replaced with a mask ROM. In replacing the EPROM with the mask ROM, peripheral circuits required for both the EPROM and the mask ROM have their circuit arrangements held basically the same, and specific peripheral circuits for use in only the EPROM have their circuit regions left as they are as logically inactive regions. | |
