M31 provides a silicon-proven ONFi I/O in different process nodes. The ONFi IO follows interface specification of the international Open NAND Flash Interface to provide on-die termination (ODT) and support the impedance calibration for ZQ, also it can be customized the required functions according to customer specifications. At present, the ONFi 4.1 I/O IP has been silicon proven at 22ULP/ULL, and it has been successfully verified on the client side at 16FFC. The ONFi I/O solutions are also available at 55nm, 40nm, 28nm, 22nm and 16nm technology process.