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Hardware interview practice

Pause headroom at 400 Gb/s

MediumComputer ArchitectureSystemVerilog

A 400 Gb/s receive port must absorb traffic for 2 microseconds after it sends a pause signal. Ignore packet overhead and safety margin. What minimum raw data headroom is required?

Choose one

Answer choices

  1. A. 100,000 bytes, because 400e9 bits/s times 2e-6 s is 800,000 bits, divided by eight.
  2. B. 800,000 bytes
  3. C. 50,000 bytes
  4. D. 100,000 bits
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