RANDOM-ACCESS MEMORY - KAWASAKI STEEL CO

Title:

RANDOM-ACCESS MEMORY

Document Type and Number:

Japanese Patent JPH0793993

Kind Code:

A

Abstract:

PURPOSE: To detect and correct an error in a smaller number of parity bits by a simple circuit.

CONSTITUTION: Regarding word data which is selected by a row address AR, four parities in the X-axis direction are found by a selector 14x for parity and by a parity generation circuit 15x. Four parities in the Y-axis direction are found by a selector 14y for parity and by a parity generation circuit 15y. Four parities in the Z-axis direction are found by a selector 14z for parity and by a parity generation circuit 15z. When errors are caused in a bit for the word data, the parities in the X-axis, Y-axis and Z-axis directions which contain the errors are combined, bit positions in which the errors have been caused are detected, and the errors are corrected by an error correction part 22b. A total of 4×3=12 are sufficient as the parities which are required.

Inventors:

NAGAGAWA YUKIMITSU

Application Number:

JP23952193A

Publication Date:

April 07, 1995

Filing Date:

September 27, 1993

Export Citation:

Click for automatic bibliography generation Help

Assignee:

KAWASAKI STEEL CO

International Classes:

G11C11/413; G06F11/10; G11C11/401; G11C29/00; G11C29/42; (IPC1-7): G11C29/00; G06F11/10; G11C11/401; G11C11/413

Attorney, Agent or Firm:

Satoshi Takaya (2 outside)

Next Patent: CIRCUIT FOR TEST MODE OF SEMICONDUCTOR MEMORY