在做电压监控时，I/O分配时出现一下错误：
Starting Prelayout Check...
Error: PRL13: Cannot place the instance rst_pad on the Lower Right quadrant locations because
the instance flash_inst/NVM_INST_CALIBRATIONDATA connected to the clock net cannot be assigned to a quadrant.
This instance must be placed on a middle left or middle right global locations.
Completed Prelayout Check
Running global checker.
Error: PLC002: No legal assignment exists for global net rst_c.
Info: Unlocking the driver or removing the region constraint for net rst_c may help to satisfy the global net assignment.
Error: PLC005: Automatic global net placement failed.
请问这是什么问题
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