The AMD Alveo U55C accelerator card includes a custom-built UltraScale+ FPGA that runs optimally (and exclusively) on Alveo architecture. The Alveo U55C card features the XCU55C FPGA, which uses AMD stacked silicon interconnect (SSI) technology to deliver breakthrough FPGA capacity, bandwidth, and power efficiency. This technology allows for increased density by combining multiple super logic regions (SLRs).
The following figure shows the three SLR regions of the XCU55C along with the connections for PCIe and QSFP. The HBM2 is co-located on the XCU55C device and connects directly to SLR0.