Auto Buffer Selection - 6.0 English

In Auto mode, few output clocks are derived from the clkout1 of the PLL through BUFGCE_DIV . If the number of clock outputs is greater than 4, the MMCM is inferred. In this case, clkout1 matched routing must be enabled to derive the clocks from the MMCM.

Buffer options ( Buffer or Buffer with CE ) are provided to help you by instantiating the appropriate buffer, which helps in creating better clock routing. When you select these options, the Wizard determines the buffer to be instantiated by taking into consideration the conditions in the following table.

Note: This feature is available for UltraScale and UltraScale+ devices only.

If you select specific buffers like BUFG , BUFGCE , BUFGCE_DIV , or No_Buffer , the Wizard instantiates them specifically.