NAND Flash controller interface circuit and flash memory system

The invention discloses an NAND Flash controller interface circuit and a flash memory system; the NAND Flash controller interface circuit comprises a command address time sequence generation circuit; the command address time sequence generation circuit can determine a time parameter corresponding to a target interface mode according to an interface selection signal; and according to the time parameter corresponding to the target interface mode, a command period time sequence and an address period time sequence corresponding to a target interface mode are generated, and the target interface mode can be any one of an SDR mode, an NV-DDR2 mode and an NV-DDR3 mode, so that a command address time sequence generation circuit can determine a corresponding time parameter according to an interface selection signal; by working under a plurality of target interface modes according to a plurality of time parameters, multiplexing of the circuit module is achieved, different circuit modules do not need to be arranged corre