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System level design of digital logic circuits using hardwired and programmable logic devices. ROMs, PROMs, and PLAs. Synchronous and asynchronous circuit design and analysis.
Typology: Lecture notes
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COUNTER DESIGN
^ A sequential circuit that goes through a prescribedsequence of states upon the application of inputpulses is called a counter. ^ The input pulses (count pulses) may be clockpulses or they may originate from an externalsource and may occur at prescribed intervals oftime or at random.
COUNTER DESIGN
^ Synchronous Counters
are constructed with one
common clock signal as the input to all the flip-flops simultaneously. Ripple Counters
are referred to as asynchronous counters. The output of one stage serves as theclock input to the next stage.
COUNTER DESIGN
^ A self-starting
counter is one in which every possible state, even those not in the desired countsequence, has a sequence of transitions thateventually leads to a valid counter state. Thisguarantees that no matter how the counter startsup, it will eventually enter the proper countersequence. A self-correcting
counter is designed so that all abnormal states have transitions leading to normalstates.
COUNTER DESIGN
-^ Design a MOD-6 counter to count in the followingsequence: 0,1,2,4,5,6. The counter must be selfstarting, with count state 3 leading directly tostate 4, and count state 7 leading directly to state0. Use JK flip-flops.
COUNTER DESIGN
COUNTER DESIGN
COUNTER DESIGN
COUNTER DESIGN
COUNTER DESIGN
-^ Design a MOD-5 counter to count in the followingsequence: 2,3,5,1,7. The counter must be selfstarting, with count states of 0,4, and 6 leadingdirectly to 2. Use JK flip-flops.
COUNTER DESIGN
COUNTER DESIGN
COUNTER DESIGN
COUNTER DESIGN
COUNTER DESIGN
-^ Design a MOD-5 counter to count in the followingsequence: 0,1,2,4,6. Treat the unused states asdon’t care conditions. Analyze the final circuit toensure that it is self-correcting. Use D flip-flops.
