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04-BS-8: December 2018

Nivaar worked solution (AI-drafted; not reviewed by a licensed engineer)

  1. Question 1 Synchronous Up/Down Mod-8 Counter
  2. Question 2 Flip-Flop Conversion, Machine Types, Number Representations
  3. Question 3 4-Bit Negative-Magnitude → 2’s-Complement Converter
  4. Question 4 Serial Sequence Detector (“1110”) on a PAL16R4
  5. Question 5 4-Bit Hex → Braille Converter

Start with Question 1 →

04-BS-8 Digital Logic Circuits — December 2018
National Exams, 3 hours, closed book (Casio or Sharp approved calculator only; one hand-written 8.5"×11" self-prepared information sheet permitted). Format: five questions, each worth 25 marks (100 total); any four constitute a complete paper and only the first four appearing in the answer book are marked. All five are solved below for completeness.

Reference texts: Mano & Ciletti, Digital Design (6th ed., Pearson) — Boolean minimization, K-maps, PAL/PLA/FPGA architectures, flip-flop conversion, sequential-circuit design, arithmetic circuits, 2’s-complement arithmetic; Floyd, Digital Fundamentals (11th ed., Pearson) — logic gates, multiplexers, shift registers, flip-flop characteristic tables, adders/subtractors.