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Latch-FF.pptx.ppt 20-02-57-415

Latch-FF.pptx.ppt 20-02-57-415 - EE 2730 Fall 2009 Latches...

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EE 2730 Fall 2009 Chapter 7.1 — 7.7 EE 2730 - Fall 2009
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Combinational-Sequential o EE 2720 o Combinational Logic o No feedback o No “memory” o Present o/p depends on present i/p o Telephone dialer o TV remote channel no. o Money changer EE 2730 - Fall 2009 o EE 2730 o Sequential Logic o Feedback o Remembers the past o Present o/p depends on present and past i/p o Telephone redial o TV remote channel up/dn o Vending machine State ≡ part of the “past” needed to produce present outputs
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A Simple Memory o Stable Configuration o No control o No practical use EE 2730 - Fall 2009 0 1 0 1 0 1 feedback
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A Controlled Memory Element EE 2730 - Fall 2009 Output Data Load TG1 TG2 d q
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A Controlled Memory Element EE 2730 - Fall 2009 Output Data Load TG1 TG2 d 0 q q’ q 1
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A Controlled Memory Element EE 2730 - Fall 2009 Output Data Load TG1 TG2 d 1 0 d d’ d
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Control of an Alarm System o Activated sensor sets alarm on o Even when sensor ceases to be activated, alarm is on o Need to reset alarm to turn it off o Alarm remembers that sensor was triggered after it was last reset EE 2730 - Fall 2009 Memory element Alarm Sensor Reset Set On Off
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Basic (SR) Latch o Qa and Qb often called Q and Q’ or Q and /Q EE 2730 - Fall 2009 Reset Set Q Q a Q b R S
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Basic (SR) Latch Function EE 2730 - Fall 2009 Q a Q b R S S R Q a Q b 0 0 0 1 1 0 1 1 0/1 1/0 0 1 1 0 0 0 no change reset set ?
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Basic (SR) Latch --- no change EE 2730 - Fall 2009 Q a Q b R S S R Q a Q b 0 0 0 1 1 0 1 1 0/1 1/0 0 1 1 0 0 0 no change reset set ? 0 0 q q q’ q’ q’ q q’ Q a Q b
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Basic (SR) Latch --- reset EE 2730 - Fall 2009 Q a Q b R S S R Q a Q b 0 0 0 1 1 0 1 1 0/1 1/0 0 1 1 0 0 0 no change reset set ? 1 0 0 1 0 1
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Basic (SR) Latch --- set EE 2730 - Fall 2009 S R Q a Q b 0 0 0 1 1 0 1 1 0/1 1/0 0 1 1 0 0 0 no change reset set ? Q a Q b R S 1 0 0 1 0 1 Q a Q b R S 1 0 0 1 0 1
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Basic (SR) Latch --- ? EE 2730 - Fall 2009 S R Q a Q b 0 0 0 1 1 0 1 1 0/1 1/0 0 1 1 0 0 0 no chang e reset set ? Q a Q b R S 1 0 0 0 1 0
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Basic (SR) Latch ---Timing EE 2730 - Fall 2009 S R Q a Q b 0 0 0 1 1 0 1 1 0/1 1/0 0 1 1 0 0 0 no change reset set ? Q a Q b R S Time 1 0 1 0 1 0 1 0 R S Q a Q b ? ? t 1 t 2 t 3 t 4 t 5 t 6 t 7 t 8 t 9 t 10
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Basic (SR) Latch --- with delay EE 2730 - Fall 2009 S R Q a Q b 0 0 0 1 1 0 1 1 0/1 1/0 0 1 1 0 0 0 no change reset set ? Q a Q b R S Time 1 0 1 0 1 0 1 0 R S Q a Q b t 1 t 2 t 3 t 4 t 5 t 6 t 7 t 8 t 9 t 10 1 ns 1 ns Not in text 1 ns 0 1 0 0 1 1
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t 1) EE 2730 - Fall 2009 S R Q a Q b 0 0 0 1 1 0 1 1 0/1 1/0 0 1 1 0 0 0 no change reset set ? Q
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