When MBUFGCE is selected explicitly, or IP Inferred MBUFGCE, a new Parameter
CE_SYNC_EXT will be available to the user. MBUFGCE
Inference by IP happens on selecting either "Buffer" or "Buffer with CE." There are
MODEL PARAMETERS for getting information on how many MBUFGCE are inferred
(C_AUTO_NUMMBUFGCE) and which clocks are connected through MBUFGCE
(C_CLK_TREE<1-7>). The user will get all this information from the summary table
CLRB_LEAF pin on MBUFGCE is active low asynchronous
clear, used to reset BUFDIV_LEAF clock dividers of MBUFGCE.
The optimal circuit will help synchronize
CLRB_LEAF pins of MBUFGCE to
LOCKED and Reset signals, guaranteeing the correct startup behavior of the MBUFGCE Clock
You can select "
CE and CLR SYNC EXTERNAL TO
CORE" from Output Clocks Tab to have the circuitry outside the IP. The
default value of
CE_SYNC_EXT is false. This means an
optimal circuit needs to be implemented by IP Core inside the wizard.
The user needs to set the parameter to true if the user wants to
implement a synchronized structure outside IP. In that case, IP will directly get those
signals from outside and will feed to respective signals of
CLRB_LEAF signals of MBUFGCE.