警告（272007）：MGL_INTERNAL_WARNING :(参数值不是值列表中预先指定的值之一。）altdpram | READ_DURING_WRITE_MODE_MIXED_PORTS分配的值为CONSTRAINED_DONT_CARE，有效值列表为DONT_CARE | OLD_DATA | NEW_DATA

由于Quartus®II12.0 SP2及更早版本中的问题，如果您的设计包含双端口存储器，您可能会在综合期间看到此警告。还可以为这些存储器生成以下警告：

Warning (287001): Assertion warning: MGL_INTERNAL_WARNING: ( The parameter value is not one of the pre-specified values in the value list.) altdpram|READ_DURING_WRITE_MODE_MIXED_PORTS The value assigned is CONSTRAINED_DONT_CARE and the valid value list is DONT_CARE|OLD_DATA|NEW_DATA