针对自主研发DSP（Digital Signal Processor）片上资源有限，大规模数据和程序存储空间不足等问题，提出并设计一种可配置的外部存储接口EMIF（External Memory Interface）。通过四个可配置的片选空间寄存器，实现与异步存储器、SDRAM以及SBSRAM三种存储器的灵活访问，并利用增强型直接存储访问模块实现内部存储器与外部存储器的高效数据传输。通过编写测试平台，比较读出数据和写入数据的一致性对EMIF进行功能验证。结果表明本文实现了8/16/32bit数据的读写突发访问，在40nm低阈值工艺下，面积为25119.36μm^2，功耗为1.296mW。

Aiming at the problems such as the limited on-chip resources of the self-developed DSP (Digital Signal Processor) and the insufficient storage space for large-scale data and programs, a configurable External Memory Interface (EMIF) design scheme is proposed and designed. This scheme achieves flexible access to three types of memory, namely asynchronous memory, SDRAM and SBSRAM, through four configurable chip selection space registers, and realizes efficient data transmission between the CPU and external memory by using an enhanced direct memory access module. By writing a testbench and comparing the consistency of read data and written data, EMIF has undergone a relatively thorough functional verification. The experimental results show that this design realizes the read-write burst access of 8/16/32bit data. Under the 40nm low-power process, the area is 25,119.36μm2 and the power consumption is 1.296mW.