72831L25TF8

72831L25TF8: Logic - FIFOs Memory Application Field and Working Principle

72831L25TF8 is a FIFO memory device, manufactured by Intel Corporation, based on a high-performance CPLD technology with 1.5MB synchronous dual-port SRAM. Its field of application is mainly within medium memory bandwidth applications, such as data buffer, data transfer and progression, as well as within system architectures where low power consumption and (optionally) an increased number of I/Os, or higher speed performance are required.

Functionality and Structure

72831L25TF8 is an asynchronous type of FIFO memory and the data loading is controlled via the logic ports on one side and the shifter logic ports on the other side. In this way, the data stored in the memory is operated in cycles and blocks of 4 words, and the memory is accordingly organised in a series of pages, each containing 32 words, each either 16 or 32 bits in size. Even though the device acts as an asynchronous FIFO, it can be programmed to operate in a sequential asynchronous mode.

Additionally, the device includes dedicated Input and Output FIFO logic for each port, including counters for both ports as well as flags for when the FIFO logic is full or empty. The overall structure of the device is a 256-bit bus for data and address, a synchronous 8-bit bus for data and a programmable logic to control address and data. The device also includes an optional circuit for the reset of the device and two separate read and write ports. For the functioning of the device, two control signals, Stop and Reset, are required.

Working Principle

The 72831L25TF8 operates as a dual-port FIFO, meaning that both ports have independent access to the same memory space, allowing for simultaneous reading/writing operations on different memory locations at the same time. This allows for the simultaneous writing and reading of data, while the internal circuitry of the device manages the data writing and reading processes. The data is written to the memory in cycles of four words and managed according to a predetermined priority policy. The memory reads data in blocks of 32 words, with each word either being 16 or 32 bits in size.

Once the data is written to the memory, a Reset signal is issued, enabling the data to be read from the memory. Once the Reset signal is issued, the data reads from the memory and the internal logic in the device enable it to determine the next data word from the memory to be sent out. This happens until the entire data block stored in the memory is read, at which point the Reset signal is issued again and the process can begin anew.

The 72831L25TF8 also includes logic ports to enable the device to treat data in cycles and blocks of four words. The data write process to these logic ports is also managed by the internal circuitry of the device and is determined by a priority policy.

Applications

As a medium-bandwidth memory controller, 72831L25TF8 is suitable for applications where low power consumption and/or high speed performance, as well as high number of I/Os, are required. Its areas of application are, thus, mainly within the fields of processors, controllers, data acquisition and data transfer systems, as well as within telecommunication and embedded systems.

The FIFO memory technology, based on high speed performance, low power consumption and several I/Os, as featured in the 72831L25TF8, is particularly suited for handheld and industrial applications, where long-life battery performance is required, as well as for computer architectures, where large amounts of data need to be quickly transferred between memory locations.

Conclusion

The 72831L25TF8 is a type of FIFO memory device manufactured by Intel Corporation, based on a high-performance CPLD technology. With 1.5MB synchronous dual-port SRAM and a 256-bit bus for data and address, the device is suitable for applications within data buffer, data transfer, data progression and battery-driven handheld and industrial applications. The device also includes logic ports to manage data in cycles and blocks of four words, enabling it to transfer data between memory locations quickly.