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Gate-level Diagram of a NAND-gate SR Flip-flop: Date: 17 June 2006: Source: Own Drawing in Inkscape 0.43: Author: ... Sách điện số/Bộ phận điện số/Bộ ...
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Gate-level Diagram of a NAND-gate SR Flip-flop: Date: 17 June 2006: Source: Own Drawing in Inkscape 0.43: Author: jjbeard: Permission (Reusing this file) PD: Other versions: Unified series of flip-flop symbols
Gate-level Diagram of a Clocked NAND-gate SR Flip-flop: Date: 17 June 2006: Source: Own Drawing in Inkscape 0.43: ... changed to nor, upgraded symbols: 22:36, 17 June ...
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D flip-flop symbol. The D flip-flop is widely used, and known as a "data" flip-flop. The D flip-flop captures the value of the D-input at a definite portion of the clock cycle (such as the rising edge of the clock). That captured value becomes the Q output. At other times, the output Q does not change.
Registers (usually implemented as D flip-flops) synchronize the circuit's operation to the edges of the clock signal, and are the only elements in the circuit that have memory properties. Combinational logic performs all the logical functions in the circuit and it typically consists of logic gates .
At each advance, the bit on the far left (i.e. "data in") is shifted into the first flip-flop's output. The bit on the far right (i.e. "data out") is shifted out and lost. The data is stored after each flip-flop on the "Q" output, so there are four storage "slots" available in this arrangement, hence it is a 4-bit register.