Priority Encoder vs One Hot Leading Zero
Hardware synthesis tools aggressively optimize logic when designers provide explicit input constraints. The schematic shows an 8-bit input A[7:0] feeding a module that outputs a 3-bit binary value Y[2:0] representing the position of the most significant 1. The baseline implementation handles arbitrary binary inputs, acting as a standard priority encoder. A second implementation adds a formal constraint guaranteeing A[7:0] is strictly one-hot. Compare the gate-level implementations of both modules. Determine how the one-hot constraint alters the Boolean expressions for Y[2:0] and evaluate the resulting area reduction.
Constraints
- Input
Ais an 8-bit vector. - Output
Yis a 3-bit vector. - Indexing is zero-based from the least significant bit.
- The unconstrained module assumes any combination of 0s and 1s is possible.
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.
This problem is part of Codiode Pro. The statement above is free to read.
The circuit builder and code editor need a desktop screen. On a phone, read the problem here and open it on a laptop to solve.