Each IO Bank contains two XPLLs, one of which is required by the integrated DDRMC. If enabled, the DDRMC uses the left XPLL in the second bank of a triplet in all configurations. In addition, if DDRMC pins are assigned to other banks in that triplet, then the left XPLL for each used bank is also required.
For example, the first triplet of the VC1902 contain banks 700, 701, and 702.
-
XPLL_X0Y0
andXPLL_X1Y0
are in bank700
-
XPLL_X2Y0
andXPLL_X3Y0
in bank701
-
XPLL_X4Y0
andXPLL_X5Y0
in bank702
XPLL_X2Y0
is the
left XPLL in that IO bank. So XPLL_X2Y0
is used by the DDRMC regardless
of the configuration, and XPLL_X0Y0
and XPLL_X4Y0
may
be used if DDR pins are used in banks 700
and 702
respectively.