Section C — Timing, interfaces, and signal integrity (20 points) 7. (6 pts) Define the following timing terms usually found in datasheets: tR (rise time), tF (fall time), propagation delay, and setup/hold times. Give typical units and why each matters for high-speed Ethernet signaling. 8. (8 pts) The Ethernet Rx differential pair requires APL (allowed peak-to-peak) common-mode range and a specified differential impedance of 100 Ω. Explain PCB layout guidelines to maintain impedance and minimize reflections between the magnetics and PHY. 9. (6 pts) For an MDIO interface operating at 2.5 MHz, the datasheet specifies maximum tSU (setup) = 100 ns and tH (hold) = 50 ns. Draw or describe the timing window relative to the MDIO clock and explain consequences of violating those timings.

Bonus (optional, 10 points) 17. (10 pts) Create a short lab exercise to characterize the device’s power consumption vs

Exam: KSZ80 OB S4LV02 — Advanced Technical Examination Instructions: Answer all questions. Show calculations and reasoning where applicable. Use SI units. Total points: 100.

Section E — Reliability, testing, and compliance (10 points) 13. (5 pts) List five reliability or compliance tests (e.g., ESD, thermal cycling, humidity, S-parameter channel test, EMI) that the datasheet might reference, and give one acceptance criterion for each. 14. (5 pts) Describe how to interpret an eye diagram and bit error rate (BER) spec in the datasheet when qualifying a 1000BASE-T PHY.

Section F — Application design and troubleshooting (10 points) 15. (5 pts) Given intermittent link loss at gigabit only, list five plausible hardware causes related to board design or component choices, and the diagnostic step to confirm each. 16. (5 pts) A recommended application schematic shows magnetics, termination resistors, and 0.1 μF decoupling caps near VDD pins. Explain placement and value rationale for decoupling and magnetics relative to the PHY.