JPH01208799A - Semiconductor storage device - Google Patents

Semiconductor storage device

Info

Publication number
JPH01208799A
JPH01208799A JP63033015A JP3301588A JPH01208799A JP H01208799 A JPH01208799 A JP H01208799A JP 63033015 A JP63033015 A JP 63033015A JP 3301588 A JP3301588 A JP 3301588A JP H01208799 A JPH01208799 A JP H01208799A
Authority
JP
Japan
Prior art keywords
memory array
time
maryd
ecc
marys
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
JP63033015A
Other languages
Japanese (ja)
Inventor
Katsuyuki Sato
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 JP63033015A priority Critical patent/JPH01208799A/en
Publication of JPH01208799A publication Critical patent/JPH01208799A/en
Pending legal-status Critical Current

Links

Abstract

PURPOSE: To shorten the accessing time of a RAM, etc., with a built in ECC circuit at the time of writing operations so as to make the cycle time shorter by constituting a memory array storing check bits of memory cells whose operating speed is faster than that of a memory array for storing input data.
CONSTITUTION: In a semiconductor storage device MU of a RAM, etc., with a built-in ECC (error correcting code), circuit ECC, a memory array MARYD for storing input data and another memory array MARYS for storing check bits formed in corresponding to the input data stored in the memory array MARYD are separately provided. The memory array MARYS are constituted of memory cells whose operating speed is faster than that of the memory array MARYD and the sum of the accessing time of the memory array MARYS and the calculating time required by the ECC circuit ECC for calculation formation of the check bits is made almost equal to the accessing time of the memory array MARYD. Therefore, the accessing time at the time of writing operations can be shortened and the cycle time can be made faster.
COPYRIGHT: (C)1989,JPO&Japio
JP63033015A 1988-02-16 1988-02-16 Semiconductor storage device Pending JPH01208799A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP63033015A JPH01208799A (en) 1988-02-16 1988-02-16 Semiconductor storage device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP63033015A JPH01208799A (en) 1988-02-16 1988-02-16 Semiconductor storage device

Publications (1)

Publication Number Publication Date
JPH01208799A true JPH01208799A (en) 1989-08-22

Family

ID=12374984

Family Applications (1)

Application Number Title Priority Date Filing Date
JP63033015A Pending JPH01208799A (en) 1988-02-16 1988-02-16 Semiconductor storage device

Country Status (1)

Country Link
JP (1) JPH01208799A (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5307356A (en) * 1990-04-16 1994-04-26 International Business Machines Corporation Interlocked on-chip ECC system
US5379304A (en) * 1994-01-28 1995-01-03 International Business Machines Corporation Method and structure for providing error correction code and parity for each byte on SIMM's
US5450422A (en) * 1994-01-28 1995-09-12 International Business Machines Corporation Method and structure for providing error correction code for each byte on SIMM'S
US5623506A (en) * 1994-01-28 1997-04-22 International Business Machines Corporation Method and structure for providing error correction code within a system having SIMMs

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5307356A (en) * 1990-04-16 1994-04-26 International Business Machines Corporation Interlocked on-chip ECC system
US5638385A (en) * 1990-04-16 1997-06-10 International Business Machines Corporation Fast check bit write for a semiconductor memory
US5379304A (en) * 1994-01-28 1995-01-03 International Business Machines Corporation Method and structure for providing error correction code and parity for each byte on SIMM's
US5450422A (en) * 1994-01-28 1995-09-12 International Business Machines Corporation Method and structure for providing error correction code for each byte on SIMM'S
US5623506A (en) * 1994-01-28 1997-04-22 International Business Machines Corporation Method and structure for providing error correction code within a system having SIMMs

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