United States Patent m
Martens et al.
[ii] Patent Number: 4,641,310  Date of Patent: Feb. 3,1987
 DATA PROCESSING SYSTEM IN WHICH UNRELIABLE WORDS IN THE MEMORY ARE REPLACED BY AN UNRELIABILITY INDICATOR
 Inventors: Theodoras G. J. A. Martens; Frits A.
Steenhof; Johannes J. W. Kalfs, all of
 Assignee: U.S. Philips Corporation, New York, N.Y.
 Appl. No.: 666,710
 Filed: Oct. 31,1984
 Foreign Application Priority Data
Nov. 2, 1983 [NL] Netherlands 8303765
 Int. CI." G06F 11/10; Gl 1C 29/00
 U.S. CI 371/38; 371/13;
 Field of Search 371/13, 38, 51
 References Cited
U.S. PATENT DOCUMENTS
3,768,071 10/1973 Krauft et al 371/51
3,780,271 12/1973 Sharkitt et al 371/51 X
4,037,091 7/1977 Beuscher 371/13
4,434,487 2/1984 Rubinson et al 371/13 X
4,441,184 4/1984 Sonoda et al 371/38 X
4,458,349 7/1984 Aichelmann, Jr. et al 371/13
Primary Examiner—Charles E. Atkinson
Attorney, Agent, or Firm—Jack E. Haken; James L.
A data processing system comprising a memory receives data in the form of data blocks. Such a data block contains at least one data word and check bits. On the basis of the check bits it is vertified whether the data block contains reliable or unreliable data words. The unreliable data words are not written into the memory but are replaced by an unreliability indicator which is written into the memory at the address reserved for the unreliable dataword in question.
9 Claims, 4 Drawing Figures