hw6sol_s08 - t ime = 1.5 + 1 = 2.5 ns Propagation delay for...

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Z resp o nds to X an d to Yafter 10 ns; Y r e sponds to Z after 5 ns. S e e FLD p. 646 for answer . P and Q wi l l o s cillate . See F LD p . 646 for ti m i n g chart . SRQ Q+ 000 0 00 1 1 o 1 0 0 o 1 1 0 100 1 1 0 1 1 1 1 0 1 1 1 1 1 S R Q 0 0 0 01 11 0 0 1 0 0 0 Q+ = R'Q+S R ' See FLD p . 646 for so l ution . For part (b), al s o use the f ol lowing Karna u gh map . Don't care s c o me from the restriction in part (a). R H Q 0 1 00 0 x For every input/state combination with the c o ndition SR = 0 ho l ding, each ci r cuit obey s th e next -s tate equation Q + = S + R'Q. W he n S = R = 1, in (a) , both o utputs are 1, and in (b), t h e l a tc h h o l d s its state .
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SRQ e- 000 0 00 1 1 010 0 o 1 1 0 10 0 1 1 0 1 1 1 1 0 1 1 1 1 1 17 (a)-(b) Clock J K (a) Q (b) Q : : . L 1 8 (a)-(b) Clock Q (a)D (b) T s 11.15 (b) A set-dominant FF from an S-R FF-The R Q 0 1 arrangement will ensure that when S = R = 1,Sj = 1 , 00 0 1 R j = 0, and e- = 1. 01 1 1 S Q 11 0 1 10 0 1 Q+ = S+R'Q R Q'
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1 1.2 1 C l oc k ClrN D Q 1 Q 2 1 1. 22 (a) D S Q 11 .2 2 ( b) R will not be ready until D goes t hrough the inverter , so we must add the delay of the inverter to the setup time: Setup
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Unformatted text preview: t ime = 1.5 + 1 = 2.5 ns Propagation delay for t he DFF: 2 .5 ns (same as for the S-R flip-f lop, since the propagation delay is measured with respect to the clock ) W henD = 0 , the n S= 0 , andR = 1 , so Q + = o. W hen D = 1, the n S = 1 , and R = 0 , so Q+ = 1. o . C " I 1T , ,1 Lo",~ ~ Q ' " ;-+ U L-\ ~ ' t Q a Q Q, ( t () ( ) (;) ( () f) 1 C> I C ) ( ) ( ) ( 3 000 Q/~I O 1 , 1 I 10 I f ' \ i-l > ( 'o ! } l~ I Q. c ) , <: J I I " I 11, 1 0 I . . Q OQ (' ) i \ /) Q . ~ , O' I fJ I I I H I , b + . O 2 : . Q~ Q o-f-Q z . Q, + Q I . Q, ~ o...
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This note was uploaded on 09/10/2008 for the course EEL 3701c taught by Professor Gugel during the Spring '05 term at University of Florida.

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hw6sol_s08 - t ime = 1.5 + 1 = 2.5 ns Propagation delay for...

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