引脚约束错误，有什么办法可以解决吗？

Question

[DRC NSTD-1] Unspecified I/O Standard: 14 out of 23 logical ports use I/O standard (IOSTANDARD) value 'DEFAULT', instead of a user assigned specific value. This may cause I/O contention or incompatibility with the board power or connectivity affecting performance, signal integrity or in extreme cases cause damage to the device or the components to which it is connected. To correct this violation, specify all I/O standards. This design will fail to generate a bitstream unless all logical ports have a user specified I/O standard value defined. To allow bitstream creation with unspecified I/O standard values (not recommended), use this command: set_property SEVERITY {Warning} [get_drc_checks NSTD-1]. NOTE: When using the Vivado Runs infrastructure (e.g. launch_runs Tcl command), add this command to a .tcl file and add that file as a pre-hook for write_bitstream step for the implementation run. Problem ports: pci_exp_txn[7], pci_exp_txn[6], pci_exp_txn[5], pci_exp_txn[4], pci_exp_txn[3], pci_exp_txn[2], pci_exp_txn[1], pci_exp_txp[7], pci_exp_txp[6], pci_exp_txp[5], pci_exp_txp[4], pci_exp_txp[3], pci_exp_txp[2], and pci_exp_txp[1].

Answer 1

这几个PCIe管脚没有约束将这几个管脚约束补上估计就没啥问题了