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C6654 为什么 ECC是4bit

Dear all:

        使用C6654,连接2片16bit的DDR3,想增加一块做ECC校验用,应该就是以下模式:

        36-bit: Three 16-bit SDRAMs (including 4 bits of ECC)。

       疑问是:从网上搜索到的资料,32bit的ECC需要7bit,为什么这里只有4bit即可?

       请大神指教!谢谢!