基于FPGA的EMIF转SPI Flash控制器设计

Design of EMIF to SPI Flash Controller Based on FPGA

EMIF是DSP芯片上的外部存储接口,为了实现DSP芯片通过EMIF接口对多片使用SPI接口的Flash芯片的数据读取,设计了一款基于FPGA的EMIF转SPI Flash控制器系统。该系统使用Verilog HDL进行设计,在Xilinx vivado环境下进行仿真实验。实验结果表明该控制器可以正确处理DSP EMIF接口发送的数据请求并从SPI Flash芯片中取回相应数据。随之,使用Xilinx公司的Zynq-7000系列FPGA芯片进行实物测试。在工程中加入ILA探针,用于抓取信号波形。使用JTAG将生成的比特流文件烧写入芯片中,通过观察探针中抓取到的信号与仿真波形一致,表明所设计的控制器工作正常。

EMIF is an external interface on a DSP chip.In order to meet the data reading requirements of multiple Flash chips using SPI interfaces through EMIF interface,a FPGA based EMIF to SPI Flash controller design scheme is proposed.The system scheme is designed using Verilog HDL and simulated in the Xilinx Vivado environment.The experimental results show that the controller can correctly process data requests sent by the DSP EMIF interface and read the corresponding data from the SPI-Flash chip.Subsequently,physical testing was conducted using Xilinx’s Zynq-7000 series FPGA chips.Add ILA probes in the project to capture signal waveforms.Using JTAG to burn the generated bitstream file into the chip,the signal captured by the probe is observed to be consistent with the simulated waveform,indicating that the designed controller is working properly.