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DRV8301: drv8301没有输出,好像它没有启动成功

Part Number: DRV8301

我用FPGA驱动这个DRV8301, 上电之后,先拉低GATE_EN引脚50MS,再接高GATE_EN引脚50MS,之后利用SPI给SDI引脚输入16'b1_0010_010_0000_1000,再输入16'b1_0011_011_1100_0000,其SDO引脚没有输出,说明该芯片没有启动。下图是配置寄存器时的时序。怎么才能功能启动这个芯片呀?