Nonvolatile memory interface circuit, storage device having the same and method of operating the same

Abstract

A storage device includes at least one nonvolatile memory device, and a controller configured to control the at least one nonvolatile memory device, wherein the controller includes a nonvolatile memory interface circuit configured to communicate with the at least one nonvolatile memory device through at least one channel, wherein the nonvolatile memory interface circuit includes a margin collector configured to collect margin information by comparing read data with sampling data, an on-chip margin search logic configured to track a valid window margin by adjusting an offset value based on the margin information, and a compensation calculator configured to determine off-chip variation corresponding to the offset value when the valid window margin is in a margin lock state.