We may want to synchronize the data to a system-wide clock in a circuit board to improve the reliability of a digital logic circuit. The “data in” at the D pin of the type D FF (Flip-Flop) does not change levels when the clock changes for low to high. A serial-in, serial-out shift register may be one to 64 bits in length, longer if registers or packages are cascaded.īelow is a single stage shift register receiving data which is not synchronized to the register clock. They will store a bit of data for each register. Serial-in, serial-out shift registers delay data by one clock time for each stage.
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