External memory interface

an External Memory Inteface is a bus protocal for communication from an intergrated circuit, such as a microprocessor, to an external memory device located on a circuit board. The memory is refered to as external because it is not contained within the internal circuitry of the integrated circuit and thus is externally located on the circuit board.

Some common External Memory Interfaces include:

• DDR
• DDR2
• GDDR