HW: Device best solution for 32bit and 64bit restricted interface! (VHDL)

We have a entity or module which has input output interface
of 32bit wide word. This entity or module will instantiate a
memory of 64bit word. Now device best VHDL solution to feed and
receive this 64bit memory using this 32bit restricted interface.

What will be impact on the highest possible speed which this
64bit memory can possibly be used.

Analyze both the cases when input and ouput interface can be
inout or (only input and only output).

What logic needs to be added in between the interface
and the memory?

- Bharat Singh | rathorebharat