Read-write protection circuit

A technology of read-write protection and circuit, applied in the field of read-write protection circuit, can solve the problem that the recorded data is changed, cannot take into account both read-write and read-only

Inactive Publication Date: 2011-11-16
HANNSTAR DISPLAY CORPORATION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] However, the chips used to record product and production information in today's consumer electronics products, such as the above-mentioned EEPROM, cannot meet the requirements of both readable and writable and read-only. Usually, this memory has a power pin for Receive the operating voltage to drive the memory, the two signal pins are used to receive the clock signal and data signal to read EDID data, and the setting pin is used to control the access state of the memory; generally speaking, the control mechanism of the memory will It is designed so that the memory is read-on

Method used

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Embodiment Construction

[0013] Various embodiments of the present application will be described in detail below, and the accompanying drawings are used as examples. In addition to these detailed descriptions, the present invention can also be widely practiced in other embodiments, and any easy substitution, modification, and equivalent change of any of the described embodiments are included in the scope of the present case, and the following claims are allow. In the description of the specification, many specific details are provided in order to enable readers to have a more complete understanding of the present invention; however, the present invention may still be practiced under the premise of omitting some or all of these specific details. Furthermore, well known procedural steps or elements have not been described in detail in order to avoid unnecessarily limiting the invention.

[0014] Figure 1A and Figure 1B A read / write protection circuit 10 according to an embodiment of the present inve...

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Abstract

Embodiments of the invention provide a read-write protection circuit which mainly comprises a memory and a control circuit. The control circuit is provided for determining electric source received by the memory. The memory is provided with a pin for determining an access state of the memory. When the pin receives a high level voltage, the access state of the memory is set as a read-only state; when the pin receives a low level voltage, the access state of the memory is set as a readable-writable state. With the design of the control circuit provided by the present invention, a user of a manufacturing terminal can read and write data in the memory conveniently, and a user of a whole machine terminal only can read the data in the memory.

Description

technical field [0001] The invention relates to a read-write protection circuit, in particular to a read-write protection circuit which is read-write at the manufacturing end and read-only at the user end. Background technique [0002] General electronic products, such as computers and liquid crystal displays, usually have a chip for recording relevant information required by the product or production. [0003] For example, the printed circuit board of the display panel of a notebook computer or monitor usually has an Electrically Erasable Programmable Read-Only Memory (EEPROM) chip, which records the extended display identification data ( Extended display identification data, EDID), which is a data format provided by the display panel, records data such as specifications that can be supported by the computer's display card (graphics card), and its recorded format conforms to the Video Electronics Standards Association (Video Electronics Standards Association, VESA) standar...

Claims

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Application Information

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IPC IPC(8): G11C7/24
Inventor 颜志扬曾俊钦王杰会
Owner HANNSTAR DISPLAY CORPORATION
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