256-BBGA encloses the ICs.There is a package named Tray which includes this module.Mounting is done using the Surface Mount method.Basically, integrated circuit is a Multi-Queue Flow-Control.You can find similar integrated circuit systems by searching for the IDT72P517*9 family.
IDT72P51749L6BBI Features
IDT72P51749L6BBI Applications
There are a lot of Renesas Electronics America Inc. IDT72P51749L6BBI Specialized ICs applications.