PAL Fixed OR Plane Limitation
Programmable Array Logic devices reduce cost and maximize speed by pairing a programmable AND plane with a fixed OR plane. Designers must map their boolean functions onto a rigid physical architecture where the number of product terms per output is hardcoded during manufacturing.
The target hardware is a basic PAL where each output pin is driven by a single OR gate connected to exactly three programmable AND gates. The logic function required for the system is Y = A'BC'D + AB'C'D + ABCD' + A'B'CD.
Determine how the architectural limitations of the PAL restrict the implementation of this function and identify valid engineering workarounds.
Constraints
- The PAL architecture provides exactly 3 AND gates hardwired to each OR gate.
- The target function
Yis provided in standard sum-of-products form. - No internal programmable feedback paths are available unless explicitly stated.
Topics
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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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