When a device is composed of multiple dies (using SSIT), CLBs are replaced with Laguna Tiles and Sites to provided dedicated logic to crossing from one die to the next. Laguna sites contain dedicated RX and TX flip flops that connect to SLLs.
A static FPGA design that provides a common interface to off-chip resources (DDR, PCIe,…) intended for multiple applications.
Super long line, these are the wires that cross between dies in a multi-die device (see SSIT).
Super logic region, in multi-die devices, each super logic region is one die connected to other die via an interposer. The routing wires that connect these SLRs are SLLs). Also see SLR (Super Logic Region).
Stacked silicon interconnect technology: Xilinx uses an interposer substrate to package multiple FPGA die into a single package.