There are two XPLLs per bank. One XPLL per bank is needed for the soft memory interface and the total number of XPLLs depends on number of banks required for the interface. The following shows the XPLL allocation/sharing rules:
- Any of the two XPLLs on a bank can be used for soft memory interface if that bank is not used by the integrated DDR MC.
- If the same bank is shared by the integrated DDR MC and the soft memory interface, XPLL-0 must be used for the integrated DDR MC and XPLL-1 must be used for the soft memory interface.
- When the same bank is shared by the soft memory interface and any IP other than the integrated DDR MC, any of the two XPLLs can be used for soft memory interface.