hey forum, my first post and im sorry to be begging for advice already but i really need help understanding fault tables. I have an exam on wednesday and if i can understand them then im pretty sure i will pass. I understand how to generate a fault table and find the minimum test vectors and devise a fault tree and whatnot but I cannot get this far as I fall at the first hurdle. Finding the function of the circuit with a fault. Below is the circuit i am working with.
Now the fault free circuit function is J = A.B + C + B'.D' i can understand that and how we got to that but what comes next is determining all the functions of the circuit with faults applied. This has been done for me below which is all well and good but I cant understand how my lecturer got the results shown i would just like some help on the working out. By the way according to my lecturer D/0 (D stuck at 0) and D/1 (D stuck at 1) are backwards on the worksheet.
after getting annoyed with this question i tried one of the examples and now ive also been struggling to even work out the algebraic functions of some circuits.
I wont paste a picture of the whole circuit/workings (unless required) but all i really want to know is how my lecturer got from this
I = A' + B' + B' + C' + B'CD + C'CD + D
to this
I = A' + B' + C' + D
thanks in advance everyone
Now the fault free circuit function is J = A.B + C + B'.D' i can understand that and how we got to that but what comes next is determining all the functions of the circuit with faults applied. This has been done for me below which is all well and good but I cant understand how my lecturer got the results shown i would just like some help on the working out. By the way according to my lecturer D/0 (D stuck at 0) and D/1 (D stuck at 1) are backwards on the worksheet.
after getting annoyed with this question i tried one of the examples and now ive also been struggling to even work out the algebraic functions of some circuits.
I wont paste a picture of the whole circuit/workings (unless required) but all i really want to know is how my lecturer got from this
I = A' + B' + B' + C' + B'CD + C'CD + D
to this
I = A' + B' + C' + D
thanks in advance everyone