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6678 DDR3设计问题

Other Parts Discussed in Thread: TMS320C6678

我的需求是不小于2GB的存储空间。

我手里有一份原理图TMS320C6678 EVM Board for Ti DSPM-8031E;里面关于DDR3的部分,有4片SAMSUNG_K4B1G1646E,还有一片SAMSUNG_K4B1G1646E和一片SAMSUNG_K4B1G0846E做ECC。我想问一下是不是只有4片是作为存储空间使用的,剩下两片只做ECC,不能用作存储?还有ECC必须有吗?不能只用4片16位的芯片拼够64位的地址线?有点糊涂,望解答。谢谢