Question

Problem 7. Consider the 74x194 4-bit bidirectional universal shift register shown below Determine the operation of this circuit by filling out the table. Assume that the register is cleared initially as indicated by the first row in the table, and then connected to +5V (before time t), as shown in schematic. Also assume that t 'is that time at which a positive edge occurs in the input signal 'clock'. Si and S0 inputs (given) are used to switch between modes of the register (also provided as reference below). +5 V 4 modes set by S1,S0 hold data 00: 01: shift right shift left R 74x194 10: parallel load 11 CLOCK CLK d CLR S1 S1 So S0 LIN 12 QD D Q0 13. C QC Q1 14 QB a2 15 QA A a3 RIN U1 5/6 Time SO Q3 Q2 Q1 Q0 Clear X X t 0 ty ta ta 0 1 ts 1 te

Answer 1

Time	S1	S0	Q3	Q2	Q1	Q0
Clear	x	x	0	0	0	0
t1	1	1	0	0	0	1
t2	1	0	0	0	1	0
t3	1	0	0	1	0	0
t4	0	0	0	1	0	0
t5	0	1	0	0	1	0
t6	0	1	0	0	0	1

Ouring t: CParale load) A DUving t s LIN 63 32oL3hift lePt with bit o) O 03 3 e Simillay t3 LIN 3 O OO 63 Q Q <o

Quing tu , 0 CHoid data) No change in output 1 OO 63 6 6, Pring ts (MBA tM -15 1s . RIN = O OIOO 3 1 a. 3imillay t: 6 6 6