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2026.1.30 浙大842考研 Day 7

  • 2026-01-31 00:31:16
2026.1.30 浙大842考研 Day 7
专业课-数字电路
  • Chapter 1 数制和码制
    • 基本要求:掌握8421 BCD码、2421 BCD码、余3码和余3循环码的编码方法;掌握格雷码的编码规律、格雷码与二进制相互转换方法。掌握二进制数的原码、反码、补码及其运算。
    • 已掌握:十进制(Decimal)0~9、二进制(Binary)0,1、八进制(Octal)0~7、十六进制(Hexadecimal)0~9,A~F 的编码规则与任意进制间的相互转换;二进制正、负数的原码、反码、补码及其运算;6种常用4位BCD码(8421码,余3码,2421码,5211码,余3循环码,格雷码),其中ASCII码不要求掌握,了解即可。
    • 总结
      • N进制数码的每一位由0~N-1构成,十六进制A~F表示十进制10~15,其中A~F分别是英文字母第1~6个字母,将其字母序号减1即为十进制数码9后的数码(从10开始)的第一位的数(0~5,对应A~E),例如D是第4个字母,则D对应的是13,通过此方法可以快速转换十六进制,而不需要再数10-A,11-B,……,只需要数字母的序号即可
      • 在数制转换时,Binary 和 Decimal 可以作为中间量,任意数制均可与二、十进制进行转换,其中8=2^3,16=2^4,八进制1位相当于二进制3位,十六进制1位相当于2进制4位,十进制转N进制时,有两种方法:短除法(整数),乘法(小数)、拼凑法,其中我觉得用拼凑法更快一些,例如十进制127转二进制,127=128-1=2^7-1,而2^7是10000000,所以可以快速写出127的二进制是1111111(7个1),二与八、十六进制之间转换很方便,但八和十六进制之间需要先转换成二进制或十进制再进行转换
      • 上面提到的 D、B、O、H 都是指无符号原码,现在将最高位表示符号位,0正1负,正数的反码、补码都与原码完全一样,负数的反码是原码符号位不变,其余位全部取反,补码在反码的基础上加1,补码、反码转原码时只需要将流程反过来即可
      • 二进制补码计算:将负号、减法运算转换成补码的加法运算,统一运算方法(正负数都是加法),符号位参与计算,溢出的符号位舍去,注意:补码运算的结果依然是补码,如果计算结果是负数还需要再转换回原码
      • 8421码、2421码、5211码这种前面带数字的编码都是恒权码(有权码),前面的数字就是这一位数码的权值,将系数乘以权值再求和就是这个编码对应的十进制数,2421码和余3码的0~4和9~5分别互补,对应的互补数相加刚好为1111,可以自动产生进位信号,余3码就是8421从第4个数开始往后取,每个数都比8421多3,所以叫余3码,2421由于低3位的权值是421与8421是一样的,所以2421码的0~4和8421码一样,5~9则用前面的数进行取反互补即可,5211码目前没找出来有什么规律,直接按权值记即可,余3循环码直接记格雷码就行了,也是将格雷码前3个数扔掉,取中间的10个数码(余3码扔掉8421码前3个数码接着按8421码写10个数码即可)
      • 格雷码(Gray Code)是循环码,4位格雷码只用记住最后一位是按照0110顺序循环即可,每往左移1位,连续的0和1增倍,格雷码要竖着一位一位写
      • 第一章课后习题做了7题,还有8题明天再做(ps:今天编稿写的有点晚,发布的时候已经转钟了,明天其实是今天o(╥﹏╥)o
    • 自我评价:感觉第一章学完应该没什么问题,主要是6种码制要经常回来复习一下,不然时间长了容易忘

    今天要早点睡!!!

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    1. CONNECT:[ UseTime:0.000535s ] mysql:host=127.0.0.1;port=3306;dbname=b_mffb;charset=utf8mb4
    2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000536s ]
    3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.006028s ]
    4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.001863s ]
    5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000672s ]
    6. SELECT * FROM `set` [ RunTime:0.001093s ]
    7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000564s ]
    8. SELECT * FROM `article` WHERE `id` = 472451 LIMIT 1 [ RunTime:0.005168s ]
    9. UPDATE `article` SET `lasttime` = 1770426148 WHERE `id` = 472451 [ RunTime:0.004713s ]
    10. SELECT * FROM `fenlei` WHERE `id` = 66 LIMIT 1 [ RunTime:0.005769s ]
    11. SELECT * FROM `article` WHERE `id` < 472451 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.016019s ]
    12. SELECT * FROM `article` WHERE `id` > 472451 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.001184s ]
    13. SELECT * FROM `article` WHERE `id` < 472451 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.011389s ]
    14. SELECT * FROM `article` WHERE `id` < 472451 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.006031s ]
    15. SELECT * FROM `article` WHERE `id` < 472451 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.004999s ]
    0.151353s