Serial-in to Serial-out (SISO) – the data is shifted serially “IN” and “OUT” of the register, one bit at a time in either a left or right direction under clock control.Serial-in to Parallel-out (SIPO) – the register is loaded with serial data, one bit at a time, with the stored data being available at the output in parallel form.Generally, shift registers operate in one of four different modes with the basic movement of data through a shift register being: Shift register IC’s are generally provided with a clear or reset connection so that they can be “SET” or “RESET” as required. The individual data latches that make up a single shift register are all driven by a common clock ( Clk ) signal making them synchronous devices. Shift Registers are used for data storage or for the movement of data and are therefore commonly used inside calculators or computers to store data such as two binary numbers before they are added together, or to convert the data from either a serial to parallel or parallel to serial format. The number of individual data latches required to make up a single Shift Register device is usually determined by the number of bits to be stored with the most common being 8-bits (one byte) wide constructed from eight individual data latches. This sequential device loads the data present on its inputs and then moves or “shifts” it to its output once every clock cycle, hence the name Shift Register.Ī shift register basically consists of several single bit “D-Type Data Latches”, one for each data bit, either a logic “0” or a “1”, connected together in a serial type daisy-chain arrangement so that the output from one data latch becomes the input of the next latch and so on.ĭata bits may be fed in or out of a shift register serially, that is one after the other from either the left or the right direction, or all together at the same time in a parallel configuration.
0 Comments
Leave a Reply. |