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FTang's avatar
FTang
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4 years ago

Cisco project 5CSTFD55F3117NF impedance abnormal

flying probe test detected the impedance to GND on net "P1v1_FPGA" lower than normal value. NG value is 42 ohms. Normal value is 190 ohms. 2 pcs D/C2049 were found issue at our NPI project nee...
FTang's avatar
FTang
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4 years ago

Hello Michael,

Maybe I misunderstood about the model. The Intel product model of 5CSTFD55F3117NF is Cyclone V E. It is a FPGA.

Cisco design a system with embedded network controller. For the issue we encountered, it is just impedance between pin "P1v1_FPGA" to GND is lower than normal.

Zawani_M_Intel's avatar
Zawani_M_Intel
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4 years ago

Hello FTang,

Can you help to provide the pin name involved?

Wani

  • FTang's avatar
    FTang
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    4 years ago

    Hi Wani,

    The pin name involved are VCC1-26 and VCC_HPS1-13.