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 ksz80 ob s4lv02 datasheet
Exam: KSZ80 OB S4LV02 — Advanced Technical Examination Instructions: Answer all questions. Show calculations and reasoning where applicable. Use SI units. Total points: 100. Section C — Timing, interfaces, and signal integrity
Section D — Registers, configuration, and software (20 points) 10. (6 pts) A register map shows a control register at address 0x00 with bits: bit 15 = reset (self-clearing), bit 12 = speed select (0=10/100, 1=1000), bit 8 = loopback enable. Describe initialization sequence after power-up to enable Gigabit mode, bring the device out of reset, and enable auto-negotiation. 11. (8 pts) Explain how MDIO/MDC transactions read a 16-bit register: outline preamble, start, opcode, PHY address, reg address, turnaround, and data phases. Give the bit lengths for each field per Clause 22. 12. (6 pts) Provide a short algorithm (pseudocode) to poll link status with exponential backoff: check up to 6 times, starting delay 100 ms doubling each attempt, stop early if link is up. bit 12 = speed select (0=10/100
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.
In this collaboration, Krsnaa Mehta has woven magic - an ode to the symphony of flavours that tantalize the palate and the memories that linger long after the last sip. It's a warm embrace of nature's exquisite beauty, adorned with intricate depictions of the lotus, the poppy. the elegant peacock, and the majestic night sky. The portrayal of twilight perfectly mirrors the amalgamation of day and night, much like the marriage of Peat and Sherry encapsulated within each bottle - a testament to the crafts- manship that has defined India for cons. Truly one of a kind that awakens you to discover.
Through this artistic collaboration, Krsnaa Mehta has crafted a homage to India's rich legacy, where the majesty of the tiger and the exquisite flower dance in delicate harmony. With every glance, feel the harmony of nature and artistry, and with every sip, savor the symphony of flavors that only Indri can offer. This Collector's Edition is a tribute to India's timeless allure, a celebration of its soul, and an invitation to indulge in a truly enchanting experience.
Drawing inspiration from the lush gardens of the royal era, where majestic elephants roam and birds glide freely - Krsnaa Mehta,, has created a design that beautifully captures the essence of Indri Single Malt Indian Whisky.The tranquil gardens and elegant arches reflect timeless beauty and architectural finesse, forming the perfect backdrop for this masterpiece. Every detail, from intricate patterns to regal elephants, celebrates India’s rich heritage and Indri’s commitment to excellence. The Diwali Collector’s Edition 2025 invites you to savour a symphony of flavours that serenade the senses. With every glance, experience the harmony of nature and artistry; with every sip, indulge in the luxury and refinement that only Indri can offer.
