Nintendo 3DS - we dismantled - FCRAM uses memory as main memory. The Fujitsu chip reference MB82M8080 is indeed a chip with 512 megabytes of FCRAM, or 128 MB FCRAM, aka Fast Cycle RAM memory is faster than SDRAM (and their variants DDRx usual) that is especially capable of transmitting information on the row and column (to reach a bit in particular) simultaneously, whereas conventional memories both send information separately.
Overall, the memory is faster especially with a 64-bit bus: there or mobile memory standard (type LPDDR) operates at 200 MHz on a 32 bit bus, the FCRAM used to work on a 200 MHz 64-bit bus, This de facto dual bandwidth. Throughput would be obtained from 3.2 Gb / s, which is quite big in a device of this type, and only smartphones and tablets recent feature LPDDR2 in dual channel reaches such speeds. 
Overall, the memory is faster especially with a 64-bit bus: there or mobile memory standard (type LPDDR) operates at 200 MHz on a 32 bit bus, the FCRAM used to work on a 200 MHz 64-bit bus, This de facto dual bandwidth. Throughput would be obtained from 3.2 Gb / s, which is quite big in a device of this type, and only smartphones and tablets recent feature LPDDR2 in dual channel reaches such speeds.
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