[Figure 1, callout 31]
The VCU128 evaluation board supports the VITA 57.4 FPGA mezzanine card plus (FMC+ or FMCP) specification by providing a subset implementation of the high pin count connector at J18 (HSPC, high serial pin connector). The VITA 57.4 standard extends the VITA 57.1 FMC standard by specifying two new connectors that increase the number of multi-gigabit interfaces from 10 to 24. Also, there is an optional extension connector (the high serial pin connector extension, or HSPCe) to boost pin-count by 80 positions, arranged in a 4x20 array. The VCU128 board does not implement the high serial pin connector/HSPCe extension.
FMC+ connectors use a 14 x 40 form factor, populated with 560 pins. The connector is keyed so that a mezzanine card, when installed on the VCU128 evaluation board, faces away from the board.