Data check method for an external memory and check system for an

Details Data check method for an external memory and check system for an Data check method for an external memory and check system for an

1996-05-01

1998-05-05

Beausoliel, Jr., Robert W.

Excavating

371 212, 371 4013, 39518318, G06F 1100

Patent

active

057488860

ABSTRACT:
An internal ROM of a CPU stores in advance a plurality of check start addresses and a skip value. The internal ROM of a CPU also stores a storing address that is determined from among retrieval addresses obtained by sequentially adding the skip value to the check start address. The external ROM stores a check sum in each storing address, where the check sum is calculated to data in each retrieval address that is determined for each combination of the check start address and the skip value. For checking the external ROM, data of retrieval addresses that are determined with a check start address and a skip value of a selected combination are read and calculated with check sum. Then the calculated check sum and the check sum stored in the storing address are compared. If they are the same each other, the external ROM is decided as normal.

REFERENCES:
patent: 4064553 (1977-12-01), Kashio
patent: 4442519 (1984-04-01), Jones et al.
patent: 4954942 (1990-09-01), Masuda et al.
patent: 5049874 (1991-09-01), Ishida et al.
patent: 5164918 (1992-11-01), Ogino et al.
patent: 5206940 (1993-04-01), Murakami et al.
patent: 5249156 (1993-09-01), Hagiwara et al.
patent: 5257388 (1993-10-01), Hayamizu
patent: 5398319 (1995-03-01), Sakamura et al.
patent: 5400342 (1995-03-01), Matsumura et al.
patent: 5404560 (1995-04-01), Lee et al.
patent: 5557558 (1996-09-01), Daito

Affiliated with

Also associated with

Rating

Data check method for an external memory and check system for an does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Data check method for an external memory and check system for an, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Data check method for an external memory and check system for an will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-66417