ID:186409 DDR pin group must have output of DQ I/O pin "<name>" to device that feeds datain port of at least two registers

CAUSE: Double data rate (DDR) pin group has an output of the specified DQ I/O pin to the device that feeds the datain port of fewer than two registers, but the output of the DQ I/O pin must feed the datain port of at least two registers

ACTION: Modify the design so the output of the DQ I/O pin to the device feeds the datain port of at least two registers.