Four, eight or sixteen bits is normal for real parts.Ībove we show the parallel load path when SHIFT/LD\’ is logic low. We show three stages due to space limitations. In general, these elements will be replicated for the number of stages required. A stage consists of a type D Flip-Flop for storage, and an AND-OR selector to determine whether data will load in parallel, or shift stored data to the right. ![]() By serial format we mean that the data bits are presented sequentially in time on a single wire or circuit as in the case of the “data out” on the block diagram below.īelow we take a close look at the internal details of a 3-stage parallel-in/ serial-out shift register. This is a way to convert data from a parallel format to a serial format.īy parallel format we mean that the data bits are present simultaneously on individual wires, one for each data bit as shown below. In addition, parallel-in/ serial-out really means that we can load data in parallel into all stages before any shifting ever begins. ![]() The parallel-in/ serial-out shift register stores data, shifts it on a clock by clock basis, and delays it by the number of stages times the clock period. Parallel-in/ serial-out shift registers do everything that the previous serial-in/ serial-out shift registers do plus input data to all stages simultaneously.
0 Comments
Leave a Reply. |