同桥大学 TONGJI UNIVERSITY Counters oWe have already learned to design counters.What is difference in this lesson: Asynchronous counters ● One simple 1 bit counter:T flip flop Cascade the counters
Counters ⚫We have already learned to design counters. What is difference in this lesson: Asynchronous counters ⚫One simple 1 bit counter: T flip flop ⚫Cascade the counters
同桥大学 Ao TONGJI UNIVERSITY Ao Count Count CR 0 Logic-1 Reset Reset 2002 Prentice Hall,Inc. (a)With Tflip-flops (b)With D flip-flops M.Morris Mano DIGITAL DESIGN,3e. Fig.6-8 4-Bit Binary Ripple Counter
同桥大学 TONGJI UNIVERSITY Analyze The A0 serve as the clock for A1 o Draw wave of the output
Analyze ⚫The A0 serve as the clock for A1 ⚫Draw wave of the output
同榜大学 TONGJI UNIVERSITY BCD counter ●
BCD counter
同源大学 TONGJI UNIVERSITY 0000 0001 010 001 0100 1001 1000 0101 Fig.6-9 State Diagram of a Decimal BCD-Counter 2002 Prentice Hall,Inc. M.Morris Mano DIGITAL DESIGN,3e