The chip includes a specialized "PCIe-to-AHB" (P2A) bridge, allowing the host CPU to access hardware resources within a 64KB range inside the BMC for shared memory applications.

, supporting speeds up to 800MHz (1600Mbps) and capacities up to 1GB. : Supports PCI-Express 2.0 , compliant with PCI Express Base Spec Revision 2.0.

Here is a curated table of the most critical, updated specs from the latest AST2500-DS-1.55.pdf :