| abstract |
The present invention provides a storage device which has a small signal transmission delay and a low power consumption, wherein an NAND-type flash memory and a controller as well as a controller and a cash memory are respectively connected with each other by means of short wiring lines. For example, an Si transistor is formed with use of a single crystal substrate, and an NAND-type flash memory is configured using the Si transistor. Since an OS transistor is able to be formed by means of a thin film method or the like, if a cash memory is configured using an OS transistor, the cash memory is able to be provided above an NAND-type flash memory by being superposed on the NAND-type flash memory. By forming an NAND-type flash memory and a cash memory in a same chip, the NAND-type flash memory and a controller as well as a controller and the cash memory are respectively connected with each other by means of short wiring lines. |