Resources Contact Us Home
Semiconductor memory having self correction function

Image Number 14 for United States Patent #4747080.

A semiconductor memory having a self correction function, includes: a plurality of memory cells which are divided into a plurality of area groups, store data, and are arranged in a matrix; a plurality of parity cells, associated with the area groups of the memory cells, for forming horizontal and vertical parity codes together with the data in the memory cells of the respective area groups; word lines for simultaneously selecting the plurality of memory cells and the parity cells; bit lines for exchanging data with the memory cells; parity bit lines for exchanging parity bit data with the parity cells; selectors for selecting data of the memory cells and data of the parity cell in the area group to which a memory cell to be checked belongs; means for performing parity check of a plurality of data from the selectors; and means for automatically correcting a bit error using the output from the parity check means. The memory cells divided into the area groups and the parity cells combined therewith are arranged so as not to belong to the same horizontal and vertical arrays of the matrix.

  Recently Added Patents
Bi-directional switch using series connected N-type MOS devices in parallel with series connected P-type MOS devices
Solar cell using polymer-dispersed liquid crystals
Providing multiple decode options for a system-on-chip (SoC) fabric
Schottky diode and method of manufacture
Air-fuel ratio control apparatus for an internal combustion engine
Generating package profiles in software package repositories using selective subsets of packages
Semiconductor process
  Randomly Featured Patents
Live vaccines comprising two mutations and foreign antigen
Apparatus, system, and method for re-generating data structures
Polylactic acid-based implant susceptible of bioresorption containing and antibiotic
Variable area flowmeter
Rotary shaft seal for drill bit cutters
Miniature monorail system
Image reading apparatus
Method for intraluminally inducing cardioplegic arrest and catheter for use therein
System and method for remote identification of energy consumption systems and components
Apparatus for the extension and retraction of a peripheral device