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Asynchronous pseudo-double port image memory access conflict processing method

An image memory, access conflict technology, used in instruments, static indicators, cathode ray tube indicators, etc., to improve reliability and avoid catastrophic consequences

Inactive Publication Date: 2008-02-20
西安龙腾微电子科技发展有限公司
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Problems solved by technology

Therefore, this detection method to find a conflict between two uncorrelated signals can have disastrous consequences due to metastable effects

Method used

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  • Asynchronous pseudo-double port image memory access conflict processing method
  • Asynchronous pseudo-double port image memory access conflict processing method

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Embodiment Construction

[0031] Referring to FIG. 1 , a complete operation cycle of the read / write operation request signal RD / WR signal of the MPU is divided into three operation areas. The operation of area 1 starts from the rising edge of the signal, and goes through an address setup time (Tas=5ns) and a read / write operation cycle. In the first operation area, the read / write operation of a memory is mainly completed, the data in the interface data register is written into the GRAM or the data in the GRAM is read out to the data register. The operation area 2 is the trigger area for internal display operations. When the read / write operation of the MPU is not performed for a long time, the WR / RD signal is always at high level. At this time, the entire operation can be considered to be in the operation area 2. When the MPU continues to perform read / write operations, the operation area 2 is located between the end point of the operation area 1 and the falling edge of the signal. In the second area of ...

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Abstract

The utility model discloses an access confliction disposing method of pseudo asynchronous double port image memory which adopts a confliction disposing method based on task scheduling and opportunely performs reasonable distribution scheduling of line scanning operation so as to eliminate the confliction cases radically, thereby ensuring no confliction when operation requests are sent at two ports. In the utility model, the reading or writing operation period of external MPU is divided into two operation areas, in the first operation area a GRAM reading or writing operation performed by the MPU is finished, the second and third operation areas are used to trigger the line scanning request of the GRAM display ports, wherein in the second operation area, the line scanning request is triggered by an inner OSC clock; in the third operation area, the line scanning request is triggered by an external reading or writing operation request, simultaneously the redundancy of both the second operation area and the third operation area is utilized to eliminate the disaster brought by meta-stable effect, thereby improving reliability of the confliction circuit.

Description

technical field [0001] The invention relates to an access conflict processing method of an asynchronous pseudo dual-port image memory. Background technique [0002] In order to reduce the area and power consumption of the liquid crystal display drive control chip, mobile communication terminals such as mobile phones generally adopt a highly integrated liquid crystal display drive control chip solution. In the monolithic integrated liquid crystal display drive control chip, in order to reduce the number of data exchanges with the external microprocessor unit (MPU), so as to achieve the purpose of reducing the burden on the MPU and the power consumption of the drive chip, it is usually necessary to have a built-in static image memory ( GRAM) to store the image display data of one frame. There are two types of access and data operations to the built-in GRAM, one is the read / write operation of the MPU to the GRAM in order to update the image display data (hereinafter referred t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G09G5/39G09G3/36G09G3/20G02F1/133
Inventor 李博魏廷存袁涛崔福胜魏晓敏
Owner 西安龙腾微电子科技发展有限公司
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