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ymiler's avatar
ymiler
Icon for Contributor rankContributor
2 years ago

Unclear synthesis message

Hi

My Quartus Prime pro version is 22.3

I get no clear error message in Analysis & Synthesis step :

The following tri-state nodes are fed by constants : The node
; 13032:13033 ; ; The following tri-state nodes are fed by constants : The node "scp_fpga_instance_wrapper_inst|cnvi_top|cnv_hip_wrapper_inst_0|cnv_hip_inst|n1" is fed by VCC
; 13032:13033 ; ;The following tri-state nodes are fed by constants : The node "scp_fpga_instance_wrapper_inst|cnvi_top|cnv_hip_wrapper_inst_0|cnv_hip_inst|n1" is fed by GND

The following tri-state nodes are fed by constants
Warning (13033): The node "scp_fpga_instance_wrapper_inst|cnvi_top|cnv_hip_wrapper_inst_0|cnv_hip_inst|n1" is fed by VCC
Warning (13033): The node "scp_fpga_instance_wrapper_inst|cnvi_top|cnv_hip_wrapper_inst_0|cnv_hip_inst|n1" is fed by GND

When I try to investigate it I don't find any "n1" signal in this hierarchy

please advise.

Fpga Devkit

6 Replies

  • FvM's avatar
    FvM
    Icon for Super Contributor rankSuper Contributor
    2 years ago
    Hi,
    look sharp, it's no error, just a warning. The connection may be intentional.

    If you don't find n1, you should at least be able to locate cnv_hip_inst in RTL or post synthesis netlist.
    • ymiler's avatar
      ymiler
      Icon for Contributor rankContributor
      2 years ago

      Hi

      I forgot to add that finally there was error following to the warnings:

      Error(13076): The node "scp_fpga_instance_wrapper_inst|cnvi_top|cnv_hip_wrapper_inst_0|cnv_hip_inst|n1" has multiple drivers.
      Error(20073): "constant VCC" is one of the multiple drivers.
      Error(20073): "constant GND" is one of the multiple drivers.

      Indeed, I can find the cnv_hip_inst instance in the RTL , but if I can't find n1 I don't have any clue how solve/understand the issue.

  • SyafieqS's avatar
    SyafieqS
    Icon for Super Contributor rankSuper Contributor
    2 years ago

    Have you able to locate the node? and then cross probe to rtl?


    • ymiler's avatar
      ymiler
      Icon for Contributor rankContributor
      2 years ago

      I found the issue, there were two assignments to same wire ( 1 in RTL and the other through XMR )

      Quartus message was unclear - the node had a different name then Quartus indicated.