Method, apparatus and system for reading and writing data of asynchronous FIFO memory

Abstract

The invention provides a data reading / writing method, a device and a system for an asynchronous first-in first-out memorizer. The asynchronous FIFO system comprises a first-in first-out memorizer, an address writing subsystem and an address reading subsystem, wherein the address writing subsystem is composed of an address writing domain gray-code coder, an address writing domain address jumping and locking unit, an address writing domain trans-clock synchronous register, an address writing domain gray-code decoder and an address writing unit; and the reading address domain subsystem is composed of an address reading domain gray-code coder, an address reading domain address jumping and locking unit, an address reading domain trans-clock synchronous register, an address reading domain gray-code decoder and an address reading unit. When the asynchronous FIFO memorizer address jumps to an initial address from a non-two-power boundary, the gray-code output is locked so as to realize stable jumping of the address, so that the asynchronous FIFO can be realized through the gray-code when the depth of the asynchronous FIFO address is not the power of two, thereby saving memory, hardware and power consumption.

Description

technical field [0001] The invention relates to a first-in-first-out system, in particular to a method, device and system for reading and writing data of an asynchronous first-in-first-out memory. Background technique [0002] In modern integrated circuit chips, with the continuous expansion of the design scale, a system often contains several clocks. One problem brought by multiple clock domains is how to design interface circuits between asynchronous clocks. Asynchronous First In First Out (FIFO) provides a simple and fast method to solve this problem. [0003] Asynchronous FIFO is a first-in-first-out circuit widely used in real-time data transmission interfaces to store and buffer data transmission between two asynchronous clocks. It writes data with one kind of clock and reads data with another kind of clock, and transmits real-time data between two different clock systems. In the application, due to the asynchrony of the read and write clocks, the overflow or underf...

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Problems solved by technology

Because, for those who don't need the full 2 n For the application of this item, this deficiency wastes hardware and power consumption

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