FIFO, the full name is First Input First Output. In system design, FIFO memory is widely used to increase data transmission rate, processing a large number of data streams, and matching systems with different transmission rates, thereby improving system performance. FIFO memory is a first-in, first-out dual-port buffer, that is, the first data that enters it is removed first, one of which is the input port of the memory, and the other is the output port of the memory. Due to the rapid development of microelectronics technology, a new generation of FIFO chips has become increasingly significant incapacity, smaller in size, and cheaper. As a new type of large-scale integrated circuit, FIFO chips are gradually being used more and more widely in high-speed data acquisition, high-speed data processing, high-speed data transmission, and multi-computer processing systems due to their flexibility, convenience, and high efficiency.
FIFO memory is the buffer link of the system, and it has several functions:
1. Cache the continuous data stream to prevent data loss when entering and storing operations;
2) The data is collected and stored in the machine, which can avoid frequent bus operations and reduce the burden on the CPU;
3) Allow the system to perform DMA operations to increase the data transmission speed. It is a crucial point. If the DMA operation is not used, data transmission will not meet the transmission requirements, and the burden on the CPU will be significantly increased, and the data storage work cannot be completed at the same time.