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用计算机自动求取一个电路的故障的测试码时,常常要遇到布尔函数表达式的运算。例如用布尔差分法求测试码时,有时要求扇出线的布尔差分,就需要从定义求,即 df/dx_i=f_i(1)f_1(0)=f_1(1)f_i(0)+f_i(1)f_i(0)其中 f_i(1)=f(x_1,x_2,…,x_(i-1),1,x_(i+1),…x_n) f_i(0)=f(x_1,x_2,…,x_(i-1),0,x_(i+1),…x_n)这时就涉及到布尔函数的“非”“逻辑乘”“和”“逻辑加”等运算。此外,在求测试码的过
When using a computer to automatically calculate a fault test code for a circuit, you often encounter Boolean function expressions. For example, when using the Boolean difference method to test the test code, sometimes it is required to define the Boolean difference of the fanout line from the definition, that is, df / dx_i = f_i (1) f_1 (0) = f_1 (1) f_i (0) + f_i ) f_i (0) where f_i (1) = f (x_1, x_2, ..., x_ (i-1), 1, x_ (i + 1), ... x_n) f_i (0) = f (x_1, x_2, ... , x_ (i-1), 0, x_ (i + 1), ... x_n) At this moment, the operations of “NOT”, “logical multiplication” and “logical addition” of the Boolean function are involved. In addition, in the test over the test