A cache memory system and method includes a DRAM having a plurality of banks, and it also includes 2 SRAMs each having a capacity that is equal to the capacity of each bank of the DRAM. In the compounds of Formula 1, A1 and A2 are each an aromatic ring, a 5-6-membered heterocyclic ring, an aromatic ring fused to a heterocyclic ring, a phenyl ring fused to a heterocyclic ring, or a cycloalkyl ring. The user interface includes a plurality of sensing units for generating sensing signals in response to the flipping operations. 0 \u03bcm, and more preferably about 0. Each PLIM includes a light emitting diode and beam focusing and diverging optics for producing one PLIB component.