This attribute enables the use of external CE inputs to control all the output pipeline stages in non-cascade mode. By default, the design uses the internally generated CEs to control all the pipeline stages. This does not apply to the OREG_CAS registers enables. In cascade mode, the OREG_CAS register enables are automatically controlled by the UltraRAM. Using the RDACCESS output signal is not allowed when external CE mode is enabled.
Note: In cascade mode, USE_EXT_CE cannot be used and should be set to
false. Consequently, in cascade mode, the external CE inputs (OREG_CE
and OREG_ECC_CE) cannot be used. This attribute is only supported when
CASCADE_ORDER=NONE.