Page History

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• 72992 - Design Advisory for Zynq UltraScale+ MPSoC/RFSoC: Possible link training failures or data errors on PCIe, SATA, or USB 3.0 protocol links using PS GTR
  • Xilinx provides patches for older Vivado Versions, Vivado 2021.1 or newer should be fixed (Status 22.03.22 → Xilinx has changed this one time, so please check always AR#72992)
• TE080x PCIe Reference Clock initialisation will be done mostly via I2C on FSBL. Xilinx provides custom access on FSBL after MIO and GTR initialisation. PLL initialisation before GTR initialisation will improve the initialisation of the link:
  • Trenz Electronic provides special FSBL inside Xilinx PSU (between MIO initialisation and GTR initialisation) to solve this problem. This is done since Vivado 18.3 reference design releases.
• Alignment Problems with SS5, ST5 connectors, which can cause connection problems:
  • Trenz Electronic has improved production to minimize tolerances.
  • Trenz Electronic starts to publish new Series TE081X which has same functionality but uses ADM6 connectors, which have very good self alignment capabilities.
• PCIe Reference CLK can cause problem with PCIe:
  • SoC/FPGA side: Xilinx GTR reference CLK supports LVDS/LVPECL. PLL will be configured with correct LVDS standard on Trenz Reference Designs. In case of custom carrier and external reference clock, see also Xilinx ARx43641.
  • PCIe Card side: PCIe requires HSCL HCSL IO or similar standard. Currently on the TEBF0808 AC coupled LVDS is used, which is generated by the PLL of the module. However, the PLLs (SI5338 of SI5345) also support HSCL. Better results are achieved HCSL .  SI5338 has internal termination and SI5345 require external termination for HCSL.
    • Trenz plan to update TEBF0808 to revision 05 with  LVDS to HCSL multiplexer.
    • For older Revisions, still use LVDS or in case of TE0803, it's possibke to archive better results when the PLL is changed to
    HSCL
    • HCSL and the capacitors on the carrier are replaced by 0Ohm resistors in case.

Products Affected

This AVN affects all Trenz Electronic TEBF0808 together with compatible SoMs: TE080x.

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