US Patent 7872941 Nonvolatile memory device and method of operating the same

A nonvolatile memory device comprises a page buffer unit, first to kth logic combination units, and a control unit. The page buffer unit includes first to Nth page buffer blocks. N and k are natural numbers. Each of the first to Nth page buffer blocks comprises m page buffers, divided into first to kth page buffer groups, and first to kth pass/fail check units configured to output respective verification signals, each indicative of a program pass or a program fail, according to data stored in latches of the page buffers included in each of the page buffer groups. The first to kth logic combination units are each configured to output respective first to kth pass/fail determination signals.