2015-2016年(2)《数字逻辑设计和应用》期末试卷A卷参考评分标准.doc

电子科技大学2015-2016 学年第二学期期末考试 A 卷
考试科目: 数字逻辑设计及应用考试形式: 闭卷考试日期: 2016 年 6 月 29 日
成绩构成比例:平时 30/20 %, 期中 30/20 %, 小班研讨 20 %, 期末 40 %
本试卷由 V 部分构成,共 5 页。考试时长: 120 分钟注:
题号
I
II
III
IV
V
合计
得分
得分


I. Please fill out the correct answers in the brackets “( )”. ( 4’ X 10 = 40’)
1. If a T flip flop with an enable input EN is constructed by a D flip flop, then the input
D=( EN⊕Q ).
2. If the minimal output voltage increment of an 8-bit DAC is , then the output voltage is
( 77* 或 ) V, when the input is 01001101.
3. A 16Kx8 ROM, which can implement binational circuit with ( 14 ) inputs and
( 8 ) outputs at most, can be built by ( 4 ) 8Kx4 ROMs .
4. To design a "1101001110" serial sequence generator, ( 4 ) flip flops are need at least.
5. A 4-bit linear feedback shift-register (LFSR) counter with no modification can have
( 15 ) valid states.
6. To build a modulo -256 counter, it requires at least ( 8 ) flip flops.
7. A ( mealy ) state machine is a sequential circuit whose output depends on the state
and inputs.
8. There are ( 2n-2n ) invalid states for an n-bit Johnson counter.
每个空格4分,错一个,扣4分。
得分
I I. Choose the correct answer and fill the item number in the brackets.
(3’ X 5=15’)
1. According to the circuit as shown in , the output F is ( a )
a. b.
c. d.

2. If a modulus-4 counter is got from the circu