Supporting un-buffered memory modules on a platform configured for registered memory modules

A RDIMM enabled memory controller may support a UDIMM by way of a register chip and a PLL chip being implemented in operational relationship with a memory slot and a memory controller configured to support a RDIMM. The memory controller may drive address and control signals from the memory controller to the register chip, and the address and control signals may be provided from the register chip to the memory slot after one clock cycle, in response to the register chip latching onto the address and control signals from the memory controller on a rising clock edge.