Asynchronous first-in first-out memory, liquid crystal display controller and its control method

Abstract

The invention is applicable to the multimedia technology field and provides an asynchronous FIFO memory, a liquid crystal display controller and a control method thereof. The control method includes: software is used to set a water level capacity register relevant to a water level mark and configure a dynamic water level value; hardware controls an address writing logic unit of the asynchronous FIFO memory to generate an address writing signal, as well as an address reading logic unit to generate an address reading signal; after being synchronized by a read clock domain synchronizer, the address reading signal is calculated together with the address writing signal to obtain the writeable excess of a read-in end; the writeable excess of the read-in end is compared with the dynamic water level value to generate a dynamic water level mark; the generated dynamic water level mark is sent to a front-end direct memory access module; and the front-end direct memory access module respectively controls Y, U and V according to the dynamic water level mark to carry out direct memory access request and release to bus bandwidth. The invention can be realized easily and solves the problem of theprior art that the utilization rate of bandwidth resources is low in realizing liquid crystal display input and output.

Description

technical field [0001] The invention belongs to the field of multimedia technology, and in particular relates to an asynchronous first-in-first-out memory, a liquid crystal display controller and a control method thereof. Background technique [0002] With the continuous development of system on chip (SOC) technology, people have been able to integrate a very complex and huge system on a small chip, and the continuous leap of microelectronics technology has also changed people's lives. In an SOC with a large amount of data transmission and processing, an asynchronous first-in-first-out memory (First IN First Out, FIFO) is a module that is often used. In a powerful high-end liquid crystal display (Liquid Crystal Display, LCD) controller, the asynchronous FIFO is a key module. It is a buffer between each internal module and the final output timing module. At the same time, it can also control Scheduling of the data throughput of the entire system. figure 1 It shows the conne...

AI Technical Summary

Problems solved by technology

Although theoretically, the total amount of bandwidth occupied by our LCD module is fixed, and the total amount reserved for other modules is also certain, but some modules do not need such a long time of idle bus, but need many shorter time occupations.

And because the LCD controller continues to occupy the bus, it may cause the entire system to fail to work properly

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