Error: Implementation failed with error [Opt 31-430] Found a FDRE that its data pin is undriven.

cnrv / fpga-rocket-chip

Wrapper for Rocket-Chip on FPGAs

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Error: Implementation failed with error [Opt 31-430] Found a FDRE that its data pin is undriven. #6

Closed SivaMounikaPeddineni closed 5 years ago

SivaMounikaPeddineni commented 5 years ago

When tried to generate the bit stream below error is encountered at the implementation stage. Error: [Opt 31-430] Found a FDRE that its data pin is undriven. Driver is required to prevent unexpected behavior:mmio/peri_Xbar/inst/gen_samd.crossbar_samd/addr_arbiter_ar/gen_no_arbiter.m_mesg_i_reg[46].

Please find the attached image for critical warning details. Kindly, help us to resolve this issue.

Screenshot from 2019-10-23 23-30-25

wsong83 commented 5 years ago

The synthesis has already failed which means there is no point to go further to implementation. From the error message of synthesis, it looks like you did not correctly generate the clock converter (a Xilinx IP block) for the design, otherwise it should not be recognized as a blackblox.

SivaMounikaPeddineni commented 5 years ago

Thanks for your response. We will work on it

wsong83 commented 5 years ago

Close. Reopen if needed.