Customers should be aware that not all XPIO banks are fabric accessible because some XPIO banks are accessible only by the hardened memory controller with no access to the fabric. The following figure shows the VC1902_D1760 die/package floorplan highlighting which nibbles in a given I/O bank are fabric accessible and which ones are not. An XPIO bank contains 54 I/Os divided into nine nibbles with each nibble containing six I/Os.
The nine YYYYYYYYY next to I/O bank 700 indicate that all the nine nibbles are accessible only by the DDR memory controller with no fabric access while the nine NNNNNNNNN next to bank 703 indicate that all the nine nibbles in this I/O bank are fabric accessible in addition to having access to the hardened memory controller. Users should pay attention to these differences when migrating across devices in a given package.