Memory device, control method for the same, control program for the same, memory card, circuit board and electronic equipment

A memory device having a single or a plurality of memory chips includes a memory part (control register, SPD memory unit) inside each memory chip, which memory part stores control data concerning the memory chip. The memory device enables writing-in or readout of the control data stored on the memory part to be able to set any desired control data for each memory chip, and, when the memory device has the plurality of memory chips, enables separate use of each of the memory chips.