A memory write protection circuit and a display device

Abstract

The invention discloses a memory write protection circuit and a display device. The memory write protection circuit comprises: a data write trigger end, wherein the data write trigger end is connectedwith a write protection pin of the memory and configured to receive a first level signal for controlling the memory to enter a write state; a write protection control circuit connected to the write protection pin of the memory and configured to provide a second level signal limiting the memory from being written with data to the write protection pin of the memory, wherein the polarity of the second level signal is opposite to that of the first level signal; an interference signal absorbing circuit connected to the data writing trigger terminal and configured to detect a level signal receivedby the data writing trigger terminal when the memory is in normal operation, and absorb the first level signal when the data writing trigger terminal is detected to receive the first level signal. Theinvention can effectively prevent the software data of the memory from being overwritten.

Description

technical field [0001] The invention relates to the technical field of electronic circuits, in particular to a memory write protection circuit and a display device. Background technique [0002] In the display device, the data in the static read-only memory SROM inside the timing controller TCON IC generally cannot be saved after power-off, while the data stored in the erasable memory EEPROM or flash memory Flash can be saved even after power-off, so it will Store the control program of the timing controller in the external memory EEPROM or Flash. [0003] The data in the memory cannot be modified when the display device is working normally. Once modified, the setting data will be wrong, which will cause the display device to display abnormally. However, the write protection pin of the memory is connected to the communication bus, and the interference signal on the communication bus may cause the signal of the write protection pin of the memory to be pulled high, so that th...

AI Technical Summary

Problems solved by technology

[0003] The data in the memory cannot be modified when the display device is working normally. Once modified, the setting data will be wrong, which will cause the display device to display abnormally.

However, the write protection pin of the memory is connected to the communication bus, and the interference signal on the communication bus may cause the write protection pin signal of the memory to be pulled high, so that the data in the memory is rewritten

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