Method for identifying DDR bit width by using WL train

The invention relates to the technical field of data bit width identification, in particular to a method for identifying DDR (Double Data Rate) bit width by utilizing a WL train, which comprises the following steps: firstly, when a DDR interface is initially configured, a DDRPHY (Double Data Rate Physical Layer) performs WL train self-adaptive adjustment according to 16bit DQ data bit width; if the DDRPHY receives and identifies the high 8-bit and low 8-bit level hopping signals of the DRAM particles, the bit width of the DQ data is 16 bits; and if the DDRPHY only receives a low 8-bit level hopping signal of the DRAM particles, the bit width of the DQ data is 8 bits. According to the method, automatic identification of the DDR protocol interface DQ data bit width can be universally realized, the principle is simple, and the realization is convenient. 本发明涉及数据位宽识别技术领域，尤其涉及一种利用WL train识别DDR位宽的方法，首先初始化配置DDR接口时，DDRPHY按照16bit DQ数据位宽进行WL train自适应调节；若DDRPHY接收并识别DRAM颗粒高8bit和低8bit电平跳变信号则DQ数据位宽为16bit；若DDRPHY仅接收DRAM颗粒低8b