采用ECC内存技术，一个8位的数据产生的ECC码要占用5位的空间，一个32位的数据产生的ECC码要占用（ ）位的空间。
- A.5
- B.7
- C.20
- D.32
正确答案及解析
正确答案
解析
ECC纠错技术也需要额外的空间来存储校正码，但其占用的位数跟数据的长度并非成线性关系。具体来说，它是以8位数据、5位ECC码为基准，数据位每增加一倍，ECC只增加一位检验位。通俗地讲，就是一个8位的数据产生的ECC码要占用5位的空间；一个16位数据的ECC码只需在原来基础上再增加一位，也就是6位；而32位的数据则只需在原来基础上增加一位，即7位的ECC码即可，以此类推。
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