72801L15PFI

Introduction of 72801L15PFI

The 72801L15PFI is a LIFO memory-based register developed by Texas Instruments, providing a history of all data it has received, similar to a stack. It has a wide range of applications and is an important part of the design of Programmable Logic Controllers (PLC).

Application Field Of 72801L15PFI

The 72801L15PFI can be used in many industrial applications, such as in motor control and flow control systems. It is specifically used to store data efficiently, as the LIFO data structure uses less memory than other FIFO designs durring the read and write processes. It is also used to simplify the data output. When the register is read, the data is readout in the order it was originally stored, instead of in the order in which it was written.

Working Principle Of 72801L15PFI

The 72801L15PFI works on the Last-In-First-Out (LIFO) data structure, where data is removed in the same order it was added. This type of data structure is useful in mission-critical applications where an earlier record needs to be accessed for comparison reasons. For example, in a PLC system, a factory temperature needs to be compared to an accepted operating temperature and the 72801L15PFI can efficiently store and output the stored data from the earliest point, allowing the comparison to be done quickly.

A 72801L15PFI contains a First-In-First-Out (FIFO) memory, which contains 16 registers for storing data. Each register holds 16-bit words and can be read or written to with one clock cycle. When the register is filled with 16 words, the first word is discarded and the remaining words are shifted one position up. In order to read the data, each word must be read one at a time, starting with the most recent word and working backwards. The chosen word is then deleted and the remaining words are shifted down.