JPS61101857A - Memory error detecting correcting circuit - Google Patents

Memory error detecting correcting circuit

Info

Publication number
JPS61101857A
JPS61101857A JP59222070A JP22207084A JPS61101857A JP S61101857 A JPS61101857 A JP S61101857A JP 59222070 A JP59222070 A JP 59222070A JP 22207084 A JP22207084 A JP 22207084A JP S61101857 A JPS61101857 A JP S61101857A
Authority
JP
Japan
Prior art keywords
rom
check bit
bit
memory
error detecting
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
JP59222070A
Other languages
Japanese (ja)
Inventor
Hiroyuki Kurosawa
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Hitachi Ltd
Original Assignee
Hitachi Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Hitachi Ltd filed Critical Hitachi Ltd
Priority to JP59222070A priority Critical patent/JPS61101857A/en
Publication of JPS61101857A publication Critical patent/JPS61101857A/en
Pending legal-status Critical Current

Links

Abstract

PURPOSE: To modify the content of an ROM, to easily modify the check code for error correction and to simplify the circuit configuration by performing the check bit generation and the correction detection of the memory error by using the ROM.
CONSTITUTION: The information bit 14 from a CPU 11 is made an address data of a check bit generator ROM 12 and the content of the ROM 12 which the address represents is written in the ROM 12 beforehand so that it will be the data of a check bit 15. In this manner, the check bit 15 is generated. The check bit 15 and a data bit 14 from the CPU 11 are added to a memory 13. The information 14 read out from a memory 21 and a check bit 25 are added to a ROM for error detecting and correcting circuit 22, and a corrected information bit 26 and error correction flags 27 and 28 are outputted to a CPU 23. For each error detecting and correcting circuit and check bit generating circuit, a ROM in which expected output value corresponding to the input is written beforehand, is used respectively, and the content of said ROM is read out. In this way, the circuit configuration is simplified.
COPYRIGHT: (C)1986,JPO&Japio
JP59222070A 1984-10-24 1984-10-24 Memory error detecting correcting circuit Pending JPS61101857A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP59222070A JPS61101857A (en) 1984-10-24 1984-10-24 Memory error detecting correcting circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP59222070A JPS61101857A (en) 1984-10-24 1984-10-24 Memory error detecting correcting circuit

Publications (1)

Publication Number Publication Date
JPS61101857A true JPS61101857A (en) 1986-05-20

Family

ID=16776641

Family Applications (1)

Application Number Title Priority Date Filing Date
JP59222070A Pending JPS61101857A (en) 1984-10-24 1984-10-24 Memory error detecting correcting circuit

Country Status (1)

Country Link
JP (1) JPS61101857A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3936704A1 (en) * 1988-11-04 1990-05-10 Mitsubishi Electric Corp Error-detecting cellular semiconductor memory with codeword generator - includes writing and read=out circuits for test data and stored codewords, integrated on same memory chip
EP0373941A2 (en) * 1988-12-15 1990-06-20 Shin-Etsu Chemical Co., Ltd. Surface-modified polymethylsilsesquioxane spherical fine particles and process of preparing the same
US5262342A (en) * 1988-11-04 1993-11-16 Mitsubishi Denki Kabushiki Kaisha Method of making a semiconductor memory device having error checking/correcting functions

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3936704A1 (en) * 1988-11-04 1990-05-10 Mitsubishi Electric Corp Error-detecting cellular semiconductor memory with codeword generator - includes writing and read=out circuits for test data and stored codewords, integrated on same memory chip
US5262342A (en) * 1988-11-04 1993-11-16 Mitsubishi Denki Kabushiki Kaisha Method of making a semiconductor memory device having error checking/correcting functions
EP0373941A2 (en) * 1988-12-15 1990-06-20 Shin-Etsu Chemical Co., Ltd. Surface-modified polymethylsilsesquioxane spherical fine particles and process of preparing the same

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