Reading and writing control method of asynchronous first-in first-out (FIFO) memory, circuit and system

Abstract

The invention discloses a reading and writing control method of an asynchronous first-in first-out (FIFO) memory, a circuit and a system. The method comprises: counting the data reading and writing times of asynchronous FIFO memory by using at least two gray code counters, wherein for different data widths, the data reading and writing times are counted by using different gray code counters; and producing a pointer to be used by a synchronous logic circuit for synchronous processing by using the gray code values of the gray code counters as code outputs. When the method, the circuit and the system are used, the reading and writing of data with different lengths can be supported, and the utilization rate of a bus is greatly improved while the correct synchronization is ensured.

Description

technical field

[0001] The invention relates to the field of digital circuit design in application-specific integrated circuit design, in particular to a read-write control processing method, circuit and system of an asynchronous FIFO. Background technique

[0002] Gray code is an unweighted code that adopts an absolute encoding method; it is a digital sorting system in which only one digit changes when switching between any two adjacent numbers. In the design of an asynchronous FIFO (First In First Out, first-in-first-out memory), Gray codes are often used as codes for asynchronous FIFO pointers, and Gray code counters are used to generate pointers. Gray code based asynchronous FIFO design such as figure 1 As shown, the pointer and FIFO address generation circuit is implemented as figure 2 as shown, figure 2 Some of the signals are explained in Table 1:

[0003] Table 1 pointer and FIFO address generation circuit signal explanation

[0004]

[0005] Since the Gray...

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