The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Feb. 08, 1994
Filed:
Jun. 22, 1992
Eric Depret, Caen, FR;
Laurent Sourgen, Aix en Provence, FR;
France Telecom, Paris, FR;
SGS-Thomson Microelectronics, S.A., Gentilly, FR;
Abstract
An integrated circuit for a passive unit counting memory card comprises p levels (10, 11, 12) of data counting memory. The levels contain corresponding numbers of cases n.sub.1 . . . n.sub.p, a write operation being achieved in a case of an upper rank level each time all the cases of the lower rank level have been enabled, the cases of the lower levels then being erased. The circuit comprises p-1 ghost levels (21, 22) identical to the p-1 upper rank levels of the p counting levels. The addressing logic of the ghost levels is such that the cases of ghost levels are addressed in write phase simultaneously with the cases of the corresponding counting levels and, after a write phase, are addressed in erase phase simultaneously with the cases of the levels of lower rank than the one that has just been enabled.