ONFI 4.0 IO is a high-speed interface for high-performance NAND Flash applications. ONFI 4.0 IO library operating speed is up to 266MHz (533Mbps) at 1.8V voltage and 400MHz (800Mbps) at 1.2V voltage. The on-die termination (ODT) is provided to improve the signal integrity (SI). The OCD/ODT calibration is provided.