Ch6_registers_and_counters

Ch6_registers_and_counters - 1 Registers &...

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Unformatted text preview: 1 Registers & Counters ECE 223 Digital Circuits and Systems 2 Registers ¡ Register is a group of flip-flops ¢ n-bit register has n flip-flops ¢ Can hold n bits of binary data ¢ Register may also contain combinational logic 3 Register with Parallel Load ¡ Specific control signal to load n-bit data ¢ Load =0, register retains the data ¢ Load = 1, register accepts new data 4 Shift Register ¡ Capable of shifting data in one or both directions ¢ Clock controls the shift operation ¡ Figure shows a simple shift register with left to right data shifting capability 5 Serial Data Transfer ¡ Serial mode Æ Data is transferred one bit at a time 6 Serial Addition ¡ Parallel adders ¡ Faster, ¡ cost more logic ¡ Serial adders ¡ Slower ¡ n-bit addition Æ n clock cycles ¡ Less hardware 7 Universal Shift Register 1 1 S1 Mode Control Para load 1 Shift left Shift right No change Operation 1 S0 8 Ripple (Asynchronous) Counter ¡ Counts the binary sequence ¢ Negative edge triggered ¢ Output of one flip- flop Æ Clock to the next ¢ Clock skew adds up 9 BCD Ripple Counter ¡ Counter must reset itself after counting the terminal count 10...
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Ch6_registers_and_counters - 1 Registers &...

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