A digital system is provided with a memory interposer module configured to be coupled between a processor module and a memory module. The memory interposer module has a memory controller configured to couple to the memory module. It also includes a first memory emulator configured to couple to the processor module via a connector, wherein the first memory emulator is configured to emulate the memory module. There is an arbiter coupled between the memory controller and the memory emulator. A second memory emulator is connected to the arbiter, wherein the second memory emulator is also configured to emulate the memory module. Each memory emulator is operable to stall a memory request when a conflict occurs.