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TSS3
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5 years ago

Why RX part of C5GT XCVRs (Transceivers) do not work.

Hi, We are working with a board designed in-house. It hosts a Cyclone 5 GT FPGA, of whose 6 XCVRs, we use 4: 3 RX @ 1485MbpS, and 1 RX&TX @4752MbpS. In some of these boards, the XCVRs work fi...
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TSS3
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5 years ago
Hi Chee,

Thank you for getting back to me.
You understand the problem correctly.
RX part of XCVRs cannot lock neither on bit-rate
nor on the data itself.
Enters/exits calibration processes all the time.
RX problems are on both RX-only and full-duplex XCVRs.
Signal-Tap signals indicate that input signals
are allegedly extremely weak to nonexistent,
as shown by the signals you've listed, as well as others.
We're not performing loopbak tests.
We could be wrong, but we suspect it's FPGAs either counterfeit
or from a faulty production batch.
Regards,
Itay