Device for deciding data read start and method thereof

The present invention relates to a semiconductor device and, more particularly, to a device for deciding the read start of environment setting data. The device for deciding data read start according to the present invention includes a storage unit which stores code key data, a read check unit which outputs a read start signal in response to the read code key data, and a control unit which starts the read of the environment setting data stored in the storage unit in response to the read start signal. The read check unit successively transmits the read start signal in response to the read code key data and outputs the read start signal to the control unit or generates the read start signal in response to the read code key data and outputs the read start signal to the control unit.