Fault Coverage Calculation
Tape-out decisions for complex ASICs are strictly gated by fault coverage metrics to ensure manufacturing defects can be caught.
The circuit below is a combinational logic block implementing the boolean function Y = (A AND B) OR C. The intermediate wire between the AND gate and the OR gate is named W1.
A collapsed fault dictionary for this circuit contains exactly 10 stuck-at faults: A s-a-0, A s-a-1, B s-a-0, B s-a-1, C s-a-0, C s-a-1, W1 s-a-0, W1 s-a-1, Y s-a-0, and Y s-a-1.
A test engineer provides a test set with two vectors: V1: A=0, B=1, C=1 V2: A=1, B=0, C=0
Trace the vectors through the logic network. Determine which specific faults are detected by the test set and calculate the final fault coverage percentage.
Constraints
- Assume all faults are single stuck-at faults.
- A fault is considered detected if the output
Ydiffers from the fault-free output for a given vector. - Provide percentage calculations as whole numbers without the percent sign.
Topics
Solve this problem
Place the gates, wire them up and watch the signals settle. Every submission runs on the same simulation engine that grades it.
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