上海海事大学数字逻辑试卷.doc

--------------------------------------------------------------------------------------装订线------------------------------------------------------------------------------------
上海海事大学试卷
2010 — 2011 学年第二学期期末考试
《数字逻辑(digital logic) 》(A卷)
班级学号姓名总分
题目
得分
阅卷人
一、填空题 (每空1分,共15分)请将正确答案写在题目中的括号内。
1、The period(周期) of the waveform below is _______, and its frequency(频率) is ________.
2、(1110)B= _________D ; (27) Q= _________B; 156= ________________8421BCD;
3、The output of sequential logic circuit not only depends on the current inputs but also depends on the_________.
4、A 3-variable Karnaugh map has_________ cells.
5、A 3-bit binary counter has a maximum modulus(模) of_________, A modulus-20 counter must have at least _________flip-flops. A modulus-10 ring counter(环形计数器) requires _________flip-flops.
6、The frequency of the waveform at ① is_________ and at ② is_________, and the overall modulus is _________.
7、An input bination that can not occur (or not allowed) can be treated as ______ .
8、A device consists of arrangements of flip-flops which can be used to store and shift data calls a_________.
二、选择题(每题1分,共计10分)
1、The term bit means( )
(A) A small amount of data (B) a 1 or a 0 (C) binary digit (D) both answers (B) and (C)
2、All Boolean expression can be implemented with( )
(A) NAND gates only (B) NOR gates only
(C) combinations of AND gates, OR gates, and inverters