EP0224206A2
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EP
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Integrated circuit memory
Assignee: Mitsubishi Electric Corp
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Filing: 1986-11-21
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Granted: —
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Expires: 2006-11-21
Abstract
Abstract An integrated circuit memory which can be applied, for example, to a memory device of a dialogue type tool information interface for an NC machine tool or a memory unit of various identification cards, comprises a fixed memory unit where necessary information is fixedly stored and the information cannot be rewritten, and a rewrite memory unit where necessary information among information of various sorts supplied from the interface or the card read/write apparatus can be rewritten if necessary, and the fixed memory unit and the rewrite memory unit are integrated in one chip or single body of one module.
Inventors
- 👤 Hayao C/O Mitsubishi Denki Kabushiki Kaisha Hirai
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-26 22:45
CPC Classifications
G; G11; G11C; G11C11/00; G11C11/005
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
59 words
An integrated circuit (IC) memory comprising a fixed memory unit where necessary information is fixedly stored and the stored information cannot be rewritten, and a rewrite memory unit where necessary information among information of various sorts inputted in the circuit can be rewritten if necessary, said fixed memory unit and said rewrite memory unit being integrated in one chip.
Claim 2
Dependent Claim
59 words
An integrated circuit (IC) memory comprising a fixed memory unit where necessary information is fixedly stored and the stored information cannot be rewritten, and a rewrite memory unit where necessary information among information of various sorts inputted in the circuit can be rewritten if necessary, said fixed memory unit and said rewrite memory unit being integrated in one chip.
Claim 3
Dependent Claim
66 words
An integrated circuit memory as set forth in claim 1, wherein the fixed memory unit is constituted by memory cell array of a mask read only memory (MASKROM) having complete nonvolatility and high reliability in information holding, and the rewrite memory unit is constituted by memory cell array of a static random access memory (SRAM) having access time at high speed and storage density being small.
Claim 4
Dependent Claim
68 words
An integrated circuit memory as set forth in claim 1, wherein the fixed memory unit is constituted by a programmable read only memory (PROM) which can set the fixed information by performing write operation one time with a mask ROM, and the rewrite memory unit is constituted by an erasable and programmable read only memory (EPROM) which can erase information by irradiation of ultraviolet ray and perform rewrite.
Claim 5
Dependent Claim
60 words
An integrated circuit memory as set forth in claim 1, wherein the fixed memory unit is constituted by PROM being programmable, and the rewrite memory unit is constituted by EPROM where stored information can be erased or written, an electrical erasable and programmable read only memory (E 2 PROM) which can be rewritten electrically, and SRAM of high speed access.
Claim 6
Dependent Claim
35 words
An integrated circuit memory as set forth in claim 1, wherein the fixed memory unit is constituted by PROM being programmable, and the rewrite memory unit is constituted by E 2 PROM being erasable electrically.
Claim 7
Dependent Claim
54 words
An integrated circuit memory as set forth in claim 1, wherein the fixed memory unit is constituted by MASKROM having high reliability and PROM being programmable, and the rewrite memory unit is constituted by EPROM being erasable and written, E 2 PROM being electrically erasable and written, and SRAM to enable high speed access.
Claim 8
Dependent Claim
53 words
An integrated circuit memory as set forth in claim 1, wherein the fixed memory unit and the rewrite memory unit are the same in set voltage, reset voltage and drive voltage, and perform transmission and receiving of information through a common address register in an information read/write apparatus installed at external terminal end.
Claim 9
Dependent Claim
52 words
An integrated circuit memory as set forth in claim 1, wherein the fixed memory unit and the rewrite memory unit formed into one chip perform information processing of various sorts regarding tools of an NC machine tool, and are assembled as a memory device of tool dialogue system having dialogue type interface.
Claim 10
Dependent Claim
45 words
An integrated circuit memory as set forth in claim 1, wherein the fixed memory unit and the rewrite memory unit formed into one module are constituted as a memory device of an identification card assembled in a plastic card for identifying information of various sorts.
Claim 11
Dependent Claim
84 words
10, An integrated circuit memory as set forth in claim 9, wherein the identification card with the fixed memory unit and the rewrite memory unit assembled therein is used for bank trading, and PROM unit as the fixed memory unit stores information by encoding, such as bank name, personal name, machine name, module name and confidential code, and E 2 PROM unit as the rewrite memory unit stores information changed corresponding to conditions, such as saving balance, machine working time and module use time.
References Cited (Backward Citations)
No citation records indexed.
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