Three settings of the write mode determine the behavior of the data available on the output latches after a write clock edge: WRITE_FIRST, READ_FIRST, and NO_CHANGE. Write mode selection is set by configuration. The write mode attribute can be individually selected for each port. The default mode is WRITE_FIRST. WRITE_FIRST outputs the newly written data onto the output bus. READ_FIRST outputs the previously stored data while new data is being written. NO_CHANGE maintains the output previously generated by a read operation.