SEMICONDUCTOR DEVICE AND CONTROL METHOD THEREOF

摘要

A semiconductor device comprises a first current-voltage conversion circuit (16) connected to a core cell (12) provided in a nonvolatile memory cell array (10), a second current-voltage conversion circuit (26) connected through a reference data line (24) to a reference cell (22), a sense amplifier (18) for sensing the outputs of the first and second current-voltage conversion circuits, a comparison circuit (28) for comparing the voltage value at the reference cell data line with a predetermined voltage value, and a charging circuit (30) for charging the reference cell data line during the precharge period thereof if the voltage value at the reference cell data line is lower than the predetermined voltage value. A control method of the semiconductor device is also disclosed. The semiconductor device and its control method can reduce the precharge time of the reference cell data line and therefore the data read time.