Hardware MCQ - 2

6. Which among the below is not true for PCIe interface?

A. PCIe supports Polarity Inversion

B. PCIe supports Lane Inversion

C. Single PCIe supports multiple devices connectivity

D. PCIe supports hot plug

Ans: C 

PCIe supports only single device over a given interface. PCIe supports hot plugging, lane inversion, polarity inversion

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7. What is the preffered AC coupling value for PCIe interface?

A. 1uF

B. 0.1uF

C. 0.01uF

D. 10uF

Ans: B 

AC coupling capacitor of 0.1uF is used on PCIe lanes

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8. What is the differential interface with tolerance of a PCIe interface?

A. 90ohms +/- 15%

B. 90ohms +/- 5%

C. 100ohms +/- 15%

D. 100ohms +/- 5%

Ans: A 

differential trace impedance of a PCIe signal is 90ohms +/- 15%

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9. How many maximum number of lanes are supported by PCIe interface?

A. 4

B. 8

C. 16

D. 32

Ans: D 

A Pcie link between two deivces can support from one lane to 32 lanes

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10. How many physical signals are present in a lane?

A. 1

B. 2

C. 4

D. 8

Ans: C 

A lane constitutes two differential signalling pairs, one for TX (TX+,TX-) and one for RX(RX+,RX-)

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11. What is the transfer rate supported by PCIe4.0?

A. 4 GT/s

B. 8 GT/s

C. 16 GT/s

D. 32 GT/s

Ans: C 

PCIe 4.0 supported transfer rate of 16 GT/s. Each lane supports 1.97GB/s data rate.

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