MEMORY DEVICE AND OPERATING METHOD THEREOF

A memory device includes a command encoder encoding a command into a command code, a command decoder decoding the command code, selecting one of a plurality of read only memory (ROM) lines according to a decoding result, and outputting an enable signal through a selected ROM line among the plurality of ROM lines, a ROM code generator including a plurality of registers storing ROM codes for executing various operations and outputting a ROM code stored in a register to which the enable signal is input, among the plurality of registers, and an operation controller executing an algorithm according to the ROM code output from the ROM code generator.