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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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ASYNCHRONOUS COUNTER
DESIGN^
ASYNCHRONOUS COUNTER DESIGN ^ Asynchronous
refers to the events that
do not occur at the same The flip-flops in an
asynchronous
counter
do not have a common clock pulse and therefore do not changestates exactly the same time. ^ The clock input of an asynchronous counteris always connected only to the LSB ff. Asynchronous counters are commonlyreferred to as
ripple counters
ASYNCHRONOUS COUNTER
DESIGN^
2-bit Synchronous Counter 1
ASYNCHRONOUS COUNTER
DESIGN^
2-bit Synchronous Counter 2
ASYNCHRONOUS COUNTER
DESIGN^
2-bit Synchronous Counter 2
ASYNCHRONOUS COUNTER
DESIGN^
2-bit Synchronous Counter 3
ASYNCHRONOUS COUNTER
DESIGN^ Propagation Delay
^ Asynchronous counters are commonlyreferred to as
ripple counters
^ The effect of the input clock is first “felt” bythe first ff (ff1) ^ There is then another propagation delaythrough ff2 before ff3 can be triggered. Therefore, the effect of an input clockpulse “ripples” through the counter,taking some time, due to propagationdelays, to reach the last ff.
ASYNCHRONOUS COUNTER
DESIGN^ Propagation Delay A 4-bit^ asynchronous
binary counter is shown. Determine the
output of each flip-flop and the propagation delay.
ASYNCHRONOUS COUNTER
DESIGN^ Propagation Delay
ASYNCHRONOUS COUNTER
DESIGN^ Propagation Delay
ASYNCHRONOUS COUNTER
DESIGN^ Propagation Delay
ASYNCHRONOUS COUNTER
DESIGN^
