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您好，
F28377d不支持外接nand flash。
详细请见手册：
25.1.1 Purpose of the Peripheral
This EMIF memory controller is compliant with the JESD21-C SDR SDRAM memories utilizing a 32-bit/16-bit data bus. The purpose of this EMIF is to provide a means for the CPU to connect to a variety of external devices including:
• Single data rate (SDR) SDRAM
• Asynchronous devices including NOR Flash and SRAM
A common use for the EMIF is to interface with both a flash device and an SDRAM device simultaneously.
Section 25.4 contains an example of operating the EMIF in this configuration.
