第二章3.ppt - Digital Logic Design and Application...

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1 Review of Chapter 2 ( 第二章内容 回顾 ) Representation of Negative Numbers ( 负数的表示 ) Signed-Magnitude [ 符号-数值(原码) ] Complement Number Systems ( 补码数制 ) Radix Complement ( 基数补码 ) Diminished Radix Complement [ 基数减 1 补码(基数反码) ] Digital Logic Design and Application ( 数字逻辑设计及
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2 Review of Chapter 2 ( 第二章内容 回顾 ) Binary Signed-Magnitude, Ones Complement, and Two s Complement Representation ( 二进制的原码、反码、补码 ) 正数的原码、反码、补码表示相同 负数的原码表示:符号位为 1 负数的反码表示: 符号位不变,其余在原码基础上按位取反 | D | 的原码基础上按位取反(包括符号位) 负数的补码表示:反码 + 1 Digital Logic Design and Application ( 数字逻辑设计及
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3 2.6 Two s Complement Addition and Subtraction ( 二进制补码的加法和减 ) Overflow (溢出 如果加法运算产生的和超出了数制表示的范围,则结 果发生了溢出( Overflow )。 对于二进制补码,加数的符号相同,和的符号与加数的符 号不同。( C in C out 不同) P.28 对于无符号二进制数,若最高有效位上发生进位或借位, 就指示结果超出范围。 5 1011 7 0111 6 1010 3 0011 11 10101 = + 5 10 1010 = - 6 Digital Logic Design and Application ( 数字逻辑设计及
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