3 10 pts 615 Dueck Assume all inputs and outputs are active

3) (10 pts) (6.15 Dueck) Assume all inputs and outputs are active high. Dais the highest priority. The figure below shows a BCD priority encoder with three different sets of inputs. Determine the resulting output code the MSB on the output Inputs. Determine the resulting output code for each input combination Qa is 0-0, 0-D 4) (10 pts) (6.20 Dueck) Make a table listing which digital audio source in the figure below is routed to output Y for each combination of the multiplexer select inputs. S is the MSB. (CD-compact disc, DAT-digital audio tape, an obsolete technology) 0 DATZ DATS DAT4

Solution

3)

a) the input to this prioirty encedoer is from D9 to D0

0101001011, Here The D9=0, next D8=1, so the highest priority pin which hold 1 as in put is D8

so the decoder ouput is 8 the binary value of 8 is 1000, so Q3=1,Q2=0,Q1=0,Q0=0

b)

the input to this prioirty encedoer is from D9 to D0

1000000001, Here The D9=1, next D0=1, so the highest priority pin which hold 1 as in put is D9

so the decoder ouput is 9 the binary value of 8 is 1001, so Q3=1,Q2=0,Q1=0,Q0=1

c)

the input to this prioirty encedoer is from D9 to D0

1101001011, Here The D9=1,so the highest priority pin which hold 1 as input is D9

so the decoder ouput is 9 the binary value of 8 is 1001, so Q3=1,Q2=0,Q1=0,Q0=1

4)

Table:

Select line	Output
S2	S1	S0	Y
0	0	0	CD1
0	0	1	CD2
0	1	0	CD3
0	1	1	CD4
1	0	0	DAT1
1	0	1	DAT2
1	1	0	DAT3
1	1	1	DAT4