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我们目前使用JMODE8,K值应该如何取值(最小值32,步长16,最大值256吗?),另外我们在测试k28.5、D21.5及Clock test pattern时出现,FPGA数据不稳定现象,在Jtest测试时,需要配置KM1值吗,还是不用配置这个寄存器它上电以后默认就是0x1F(对应最小K32)?