72255L20PF

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72255L20PF Application Field & Working Principle

The 72255L20PF is part of a larger family of First-In-First-Out (FIFO) memories, with members up to 64kB in size, and designed for use in a variety of digital systems. FIFO memories are used in areas such as stream processing, data acquisition, data communication, video processing, data buffering, and asynchronous data transfer. This particular device, the 72255L20PF, is a 2kB FIFO memory.

At its core, the 72255L20PF is a synchronous, single-ported, FIFO memory. It is designed with a data port for loading and unloading data, a control port for interfacing with a host, and a write and read port to adjust the memory size dynamically. The 72255L20PF also has an optional voltage supply that can be used to energize other peripherals on the board. As a continuous input-output (CIO) memory, it can be easily configured and managed through the use of embedded registers.

Physical Characteristics

The maximum addressable space of the 72255L20PF is 4kB, though this can be adjusted at any time by utilizing the write and read ports. The package size is just 9.2mm x 13mm and the pitch of the package is 0.8mm. The control port uses two pins, while the write and read ports use eight pins, meaning the device has a total of 10 pins. The write and read ports enable the device to be configured with up to eight 8-bit inputs and eight 8-bit outputs.

Functional Properties

The 72255L20PF is a FIFO memory and one of the main benefits is that its operation is asynchronous. This means that data can be loaded and unloaded from it without having to wait for other instructions to be carried out. It also features three different Modes of operation, allowing it to be used as a regular FIFO memory, a circular buffer, or a big-endian FIFO memory.

The device is also safe against data loss if external power is lost, as it features a Power-On Reset function that resets the FIFO memory automatically. This is enabled by an internal reset signal generated when the device registers a power-on reset event. There is a Power-Down mode as well, which allows the device to operate with a lower power consumption when it is not actively performing data transfers.

Applications

The 72255L20PF is primarily used in applications that require the transfer of data, such as data communication and video processing. It is also used in applications that need preset FIFOs, such as motion control and video/audio streaming, where it can save speed and power. Furthermore, it is often used in intelligent test equipment, programmable controllers, file servers and storage systems, industrial automation systems, and data acquisition systems.

Working Principle

The 72255L20PF works on the basis of a FIFO buffer. The data is loaded into the buffer through the ‘Write’ port, while the data is unloaded from the buffer through the ‘Read’ port. The data transfers in both directions happen asynchronously, meaning the device doesn’t need to wait for instructions to be carried out before it can begin the data transfer process. It is also possible to adjust the size of the FIFO buffer, by using the write and read ports.

The underlying technology used by the 72255L20PF is Static RAM. This type of memory provides a high degree of reliability, as it is non-volatile and does not require frequent refreshing. It is also suitable for applications in which data must be retrieved quickly, as it allows for random access to memory.

Conclusion

The 72255L20PF is an asynchronous, FIFO memory designed for reliable and quick data transference. It is well-suited for data communication applications, video processing, and file servers, as well as other applications that require preset FIFOs. Additionally, it features an adjustable FIFO buffer that can be resized to fit any need.

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