These registers are made up of D flip-flops, which can serve as memory locations. Clearly, parallel data transfer is faster than serial data transfer, but serial transfer has the advantages of requiring less hardware. The illustration below shows the parallel transfer of 8 bits of data from the X Register to the Y Register upon application of an enabling transfer pulse. HyperPhysics***** Electricity and magnetism Since four clock cycles are needed, it is much slower than parallel transfer, but is simpler and cheaper. Data Transfer: Serial and Parallel Serial Data TransferĪs an example of serial data transfer using the shift register approach, a set of four shifts triggered by clock pulses places the contents of the X-register into the Y-register.
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