chap6(4_in_1)

chap6(4_in_1) - ELEC151 Digital Circuits and Systems...

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ELEC151 Digital Circuits and Systems Lecture Note #6 Registers and Counters • Registers 6-1 – A group of flip-flops in parallel hift Registers • Shift Registers 6-2 – A group of flip-flop in series ounters • Counters – Ripple counters 6-3 – Synchronous counters 6-4 – Other counters 6-5 • HDL for registers and counters (6-6) – will be covered later • Reading Assignments: Ho-Chi Huang, Lecture Notes, No. 6-1 – Section 6-1, 6-2, 6-3, 6-4, 6-5, 11-14 ELEC151 Digital Circuits and Systems TTL Functional Selection P.1-3 Ho-Chi Huang, Lecture Notes, No. 6-2 ELEC151 Digital Circuits and Systems TTL Functional Selection P.1-4 Ho-Chi Huang, Lecture Notes, No. 6-3 ELEC151 Digital Circuits and Systems TTL Functional Selection P.1-4 Ho-Chi Huang, Lecture Notes, No. 6-4
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ELEC151 Digital Circuits and Systems TTL Functional Selection P.1-5 Ho-Chi Huang, Lecture Notes, No. 6-5 ELEC151 Digital Circuits and Systems TTL Functional Selection P.1-6 Ho-Chi Huang, Lecture Notes, No. 6-6 ELEC151 Digital Circuits and Systems Note in Sequential Logic • Basic building blocks of sequential logic (5-1/2/3) – Latches and flip-flops old its previous value » hold its previous value » set or reset a new value » toggle its previous value – SR, D, JK and T types – NOR gates, NAND gates or transmission gates • Common but more complex sequential circuit (Chapter 6) – Storage registers hift registers – Shift registers – Counters All are available as TTL IC • General sequential circuits (5-4/5/6/7) – Analysis and design Ho-Chi Huang, Lecture Notes, No. 6-7 ELEC151 Digital Circuits and Systems 4-bit (Storage) Register (FF in Parallel) Ho-Chi Huang, Lecture Notes, No. 6-8 With Reset function With input enable (Load) function
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ELEC151 Digital Circuits and Systems TTL Example: 8-bit Register with Output Enable Ho-Chi Huang, Lecture Notes, No. 6-9 ELEC151 Digital Circuits and Systems TTL Example: 8-bit Register with Input Enable Ho-Chi Huang, Lecture Notes, No. 6-10 ELEC151 Digital Circuits and Systems Shift Register ascading of flip ops series form a shift register • Cascading of flip-flops in series to form a shift register – New value to first stage while the second stage obtains current value of the first stage » Shift function (in-series arrangement) » Storage function (by flip-flop) IN Q0 Q1 D Q DQ CLK Q’ Q’ 100 IN Q0 Q1 Ho-Chi Huang, Lecture Notes, No. 6-11 CLK ELEC151 Digital Circuits and Systems 4-bit Shift Register ach stage performs set/reset f nction • Each stage performs set/reset function – D flip-flop is good for shift register an JK flip- op be used for shift register? Can JK flip flop be used for shift register? » Yes, and in many alternative implementations – How about T flip-flop? Q 1 1 Q 2 0 Q 3 0 Q 4 0 hift 0 0 1 0 0 1 0 0 S Shift Ho-Chi Huang, Lecture Notes, No. 6-12 0 0 0 1 Shift
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ELEC151 Digital Circuits and Systems Serial Transfer Ho-Chi Huang, Lecture Notes, No. 6-13 ELEC151 Digital Circuits and Systems Serial Adder • Shift register A holds the augend and B holds the addend
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chap6(4_in_1) - ELEC151 Digital Circuits and Systems...

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