Registers and Counters
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1 Registers and Counters Clocked sequential circuit = F/Fs and combinational gates Register Group of flip-flops (share a common clock and capable of storing one bit of information) Consist of a group of flip-flops together with gates that affect their operation (data transfer) Counter A register that goes through a predetermined sequence of binary states To produce the prescribed sequence of states 4 bit register Loading or updating the positive edge of clock Output can be sampled at any time Asynchronously reset by Clear_b 1
2 Register with Parallel Load Master clock Loading and updating the register If the contents of the register must be left unchanged Inputs must be held constant Clock must be inhibited from the circuit Advisable to control the operation of the register with the D inputs Two channel MUX 2
3 6.2 Shift Registers A register capable of shifting the binary information in a selected direction A chain of flip-flops in cascade with the output of one flip-flop connected to the input of the next flip-flop All F/Fs receive common clock Unidirectional Controlled through the D inputs of F/F rather than through clk FIGURE 6.3 Four bit shift register 3
4 Serial Transfer In serial mode, one bit information is transferred and manipulate at a time In parallel mode, all bits is transferred simultaneously during 1 clk FIGURE 6.4 Serial transfer from register A to register B 4
5 Serial Addition Serial adder: two binary numbers to be added serially Differences Parallel load Number of fulladder circuits Combinational vs. Sequential circuit 5
6 Sequential Circuit Design 6
7 FIGURE 6.6 Second form of serial adder 7
8 Universal Shift Register Shift register can provide the input and output terminals for parallel transfer Shift right and shift-left capabilities Universal shift register = shift and parallel-load A clear control A clock input Shift right Shift left Parallel load N parallel output Unchanged Unidirectional shift register Bidirectional shift register 8
9 FIGURE 6.7 Four bit universal shift register 9
10 6.3 Ripple Counters Counter: a register goes through a prescribed sequence of states upon the application of input pulses Input pulses: clock pulses or external source (at a fixed interval of time or at random) Sequence: binary number sequence or any other sequence of states N bit binary counter: n flip-flops, count in binary from 0 through 2 n -1 Ripple counters: F/F output transition serves as a source for triggering other F/F (C is not common clock pulse) Synchronous counters: C inputs of all F/F receive the common clock 10
11 Binary Ripple Counter A series connection of complementing F/Fs JK flip-flop (input tied) T flip-flop Receive the incoming count pulses at the least significant bit ( ) Binary countdown counter Positive edge of clock 11
12 BCD Ripple Counter A sequence of 10 states and return to 0 (binary code with four bits) Asynchronous sequential circuit 12
13 Three-decade Decimal BCD Counter FIGURE 6.11 Block diagram of a three decade decimal BCD counter 13
14 6.4 Synchronous Counters A common clock triggers all flip-flops simultaneously In a synchronous binary counter Flip-flop in the least significant position is complemented with every pulse Flip-flop in any other positions is complemented when all the bits in the lower significant positions are equal to 1 Regular pattern constructed with complementing F/Fs and gates 14
15 Up-Down Binary Counter A synchronous countdown binary counter Flip-flop in any other positions is complemented when all the bits in the lower significant positions are equal to 0 Inputs to the AND gates must come from the complemented outputs instead of normal Up-Down Counter Up input = 1 up count Down input = 1 down count Up and down inputs = both 0 no change Up and down inputs = both 1 up count Up input has priority over the down input 15
16 BCD Counter Binary-coded decimal from 0000 to 1001 and back to 0000 When 1001, y=1: enable the count of the nexthigher significant decade 16
17 Binary Counter with Parallel Load Parallel-load capability for transferring an initial binary number into the counter prior to the count operation 17
18 BCD Counter using a Counter with Parallel Load 18
19 6.5 Other Counters Design to generate any desired sequence of states Use to generate timing signals to control the sequence of operations in a digital system Implemented by shift registers Divide-by-N counter (modulo-n counter) Nonbinary counters 19
20 Counter with Unused States Use fewer than the maximum possible number of states for N F/F (<2 n ) For unused states Treated as don t care conditions Assigned specific next states 20
21 Self-correcting after one or more clock pulses Additional logic to direct every unused state to a specific next state FIGURE 6.16 Counter with unused states 21
22 Ring Counter To produce the sequence of timing signals To generate 2 n timing signals 1. By a circular shift register with only one F/F being set at any particular time Initial value: 1000 Preset/Clear Flip-flops Shift register with 2 n flip-flops 2. By a counter with a decoder n-bit binary counter together with an n-to-2 n -line decoder 22
23 Johnson Counter For unused states, To generate the timing signals with a combination of a shift register and a decoder Switch-tail ring counter K-bit switch-tail ring counter with 2k decoding gates to provide outputs for 2k timing signals The number of F/Fs needs is one-half the number of timing signals The number of decoding gates is equal to the number of timing signals and only two-input gates are needed FIGURE 6.18 Construction of a Johnson counter 23
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