TW200807436A - Write protect controller and control method thereof - Google Patents

Abstract

Write protect controller comprises a connector comprising a connection detection terminal, a switch unit, and a microprocessor. When the connection detection terminal is in first state, the switch unit operates in first mode. When the connection detection terminal is in second state, the switch unit operates in second mode. When the switch unit operates in the first mode and the microprocessor is enabled, the potential of a write protect pin of a memory unit is controlled by the microprocessor. When the switch unit operates in the second mode and the microprocessor is disabled, the write protect pin is assigned a reference potential and the memory unit can be read/write normally.

Description

200807436 IX. Description of the Invention: [Technical Field] The present invention relates to a write protection control device coupled to a write protection pin of a wafer for controlling a write protection function of the wafer. [Prior Art] An electronic system usually has at least one memory unit, such as Programmable Read Only Memory (PROM), Erasable Programmable Read Only Memory (EPROM), or electronic Elastically Erasable Programmable Read Only Memory (EEPROM), etc. can be erased. The manufacturer can burn the software in the memory unit as the firmware of the electronic system; the parameters of the electronic system can also be burned in the memory unit. The memory unit typically has a write protection pin to activate or deactivate the write protection function of the memory unit. If the voltage of the write protection pin value is equal to a reference potential, the memory unit can be written to the data; if not equal to the reference potential, the memory unit does not allow the user to write data into it. ^ In the traditional electronic system production process, 'mainly adopts ": hardware control" or "software control" to determine the potential of the write protection pin. "Hardware Control" directly connects the write protection pin to the = topsoil potential by the line, so that the memory unit - direct compilation in the writable person_state two-body control" will be light into the protection pin Connected to a treatment to stay, --, 1 - bucket -, > at the Department of Wang Ding, by the processing of the single 7L 疋 疋 舄 | 只 只 只 | 0535-A21333TWF(N2);A05599;GLOR|〇US 6 200807436 The advantage of "hardware control" is that you can write data to this memory without using other devices (such as the processing unit used in "Software Control"). Unit 2 = Point is a situation in which data miswriting may occur. Taking the display as an example, if the display uses the presentation data channel command interface (9) to delete the Channel/Command Interface, DDC/CI), and the hardware control unit maintains the memory unit in the state of writable data, the storage is saved. The datagram in the quotation unit may be overwritten by DDC/CI. Using the "software control" to control the write protection function of the memory unit by the processing unit, the memory unit can be mis-written by DDC/CI. The situation happened. However, power must be supplied to the processing unit to burn the data into the memory unit. Therefore, this “software control” technology increases the complexity of the production process and the factory environment. We need a new technology to overcome the problems faced by the above "hardware control" and "software control". SUMMARY OF THE INVENTION The present invention provides a write protection control device coupled to a memory device to control a write protection function of the memory unit: the write protection control device can prevent the memory The unit is miswritten, simplifies the production process of the electronic system, and simplifies the factory operating environment. The write protection control device proposed by the present invention includes a connection unit, a switching unit, and a processing unit. The connection unit has a detection position. The switching unit is coupled between the detection pin and the write protection pin of the memory unit. The processing unit is connected to the write protection pin. When the detecting pin is in a first state, the switching unit operates as a first mode 0535-A21333TWF(N2); A05599; GLORI〇US 7 200807436. When the detecting pin is in a second state, the switching unit operates in a second mode. When the switching unit operates in the first mode, if a power supply is supplied to the processing unit, the write protection function of the memory unit is controlled by the edge processing. When the switching unit operates in the second mode, if no power is supplied to the processing unit, the write protection pin is connected to a reference potential by the switching soap unit, and the memory unit can be read and written normally; If the name source is powered to the processing unit, the potential of the write protection pin is controlled by the processing unit.

When the pin is connected to a reference potential, the memory unit can be read and written normally. The switching unit includes a switch. The switch is located between the write protector and a reference potential. When the switching unit is in the first mode k, the break switch is not turned on. When the switching unit operates in the second mode, the switch is turned on and the write protector (4) is connected to the reference. The switch can be a transistor. The switching unit further includes a first electric:, a second resistor, and a third resistor. The first resistor is coupled between the detecting pin and the base of the transistor. The second resistor is turned to the third: and the first end is lightly connected to a power source. The second resistor and the third resistor: the second one is connected to the electric (four) and the detecting pin. The thunder and face of the thunder and the ejector are connected to the write protection foot and the reference ray position. The detection pin is in the first state when it is connected to the reference potential: the _ bit is in the second state when floating. The switching unit may further include a two-two diode. The anode and cathode of the Zener diode are connected to the fresh potential and the detection pin. The reference potential can be the ground of the power supply:

〇 535-A21333TWF (N2); A05599; GLOR | 〇 US 200807436. The memory unit is developed by the above-mentioned write protection control device so that it is developed by a kind of mine. The f-electronic system includes a memory unit, and the above-mentioned write file is thinned, and the package j is mounted. The write protection control device controls the input of the memory unit into the irw, so that the electronic system can determine how to operate the memory according to the signal of the detection plug and the power supply of the processing unit. Unit write protection.

The electronic system can be an image display device or a video display device, and the connection unit can be a D-sub, a digital visual interface (Digitai Visual InterfaCe, DVI) connector, or a high-resolution multimedia audio and video terminal (High Definition Multimedia). Interface, HDMI). The present invention also provides a control method for controlling the write protection pin of the memory unit of the electronic system. The memory unit can be read and written when the potential of the protection pin is equal to a reference potential. When there is no power supply to the electronic system, the control method can provide power to a memory unit in the electronic system by a computer system externally connected to the electronic system, and the memory unit is replaced by a switching unit in the electronic system The write protection pin value is connected to the reference potential, so that a computer system externally connected to the electronic system can still read and write the § memory unit. If a power source is supplied to a processing unit of the electronic system, the control method causes the processing unit to control the write tank position of the memory unit to determine whether to read or write the memory unit. The reference potential mentioned in the above control method can be a ground. When the electronic system is activated and in normal use, if the electronic system produces 0535-A21333TWF(N2); A05599; GLORIOUS 9 200807436 to the computer system, the detection pin of the electronic system is grounded, and the transistor of the switching unit is turned off. . At this time, if power is supplied to the processing unit of the electronic system, the write protection pin of the memory is controlled by the processing unit. At the factory end, the electronic system is externally connected to a computer system, and when the data of the snow-brain system is to be burned to the memory of the electronic system, if the supply of the lightning source is stopped to the electronic system and the detection of the electronic system is performed, When the bit is changed to float, the transistor of the switching unit is turned on, so that the writing pin of the electronic device is grounded. At this time, the power of the memory unit is provided by the computer system. In this case, even if power supply to the electronic system is stopped, the lightning system can read and write the memory unit of the electronic system. [Embodiment] FIG. 1 is an example of a write protection control device proposed by the present invention for explaining how the technology of the present invention can be used in an electronic system. The two-two electronic system can be an image display device or a Audio and video display device. The connection unit of the system can be a D_sub, a digital visual interface connection =, or a high resolution multimedia audio and video terminal. This embodiment is a connection unit of the -D_sub electronic system. A write protection control device includes a detection pin 1〇

Element 104, and a processor 106. The processing unit in the microprocessor 1〇6 A 包包子糸. The detection pin 102 is the detection pin of the D_sub (108). Switching early 104 is lightly connected between the debt measuring pin 1〇2 and a memory unit ^input protection pin WP. The write protection pin wp is also coupled to the micro 106. The write protection control device is used to control the writing of the memory unit:

0535-'A21333TWF(N2); A05599; GLORiOUS 200807436 protection function. The memory unit 1 ι used in this embodiment is a kind of taizi 弋 erasable programmable read only memory (臓OM), item will be protected; bit WP is grounded, and the memory unit 11 can be read and written normally. Two: (10) Connected to a host. (Not shown in _) and lightly connected to the main source of the turtle. Required by the microprocessor 106.] Chu source must be provided by the source of the electronic π... element p〇Wer2. One of the power sources p0weri and p〇wer9 will be responsible for supplying power to the memory unit 110. The power supply terminal 112 and the power source coupled to the 14 are the same as those used by the memory unit 110. D_sub(i〇8)

The pins 116 and 118 are respectively coupled to the pins SCL and SDA of the memory unit 11 . The switching cover unit 104 includes a switch (i.e., transistor qi), a first resistor R1, a second resistor R2, a third resistor R3, and a Zener diode Z1. The collector and the emitter of the transistor qi are respectively coupled to the write protection pin WP and a reference potential (in this example, the reference potential is the ground groimd). The first resistor R1 is coupled between the detecting pin 1〇2 and the base of the transistor Q1. The first ends of the second resistor R2 and the third resistor R3 are coupled to the power supply terminal 112. The second ends of the second resistor R2 and the third resistor R3 are coupled to the collector and the detection pin 102 of the electric crystal Q1, respectively. The anode of the Zener diode Z1 is grounded and the cathode is coupled to the detection pin 102. When the host connected to the D-sub (108) is an image output device (such as a personal computer/PC), the image output device will lightly connect the detection pin (ie, 1 〇 2) to the ground (ground). To indicate that the electronic system has been connected to the image output device, the detection pin 102 is in a first state, the switching unit 104 operates in a first mode, and the transistor qi is not turned on. At this time, 0535-A21333TWF(N2); A05599; GLORIOUS 11 200807436 If the power supply 2 of the microprocessor is in the power supply state, the write protection function of the memory unit 11 is controlled by the microprocessor 1〇6. When the host connected to the D-sub (108) is an experimental platform (for example, a machine in the factory for burning the factory program in the memory unit 11), the detection pin of the D_sub (1〇g) is Floating, the detecting pin 1 〇 2 is in a second state, the switching unit 104 operates in a second mode, the transistor Q1 is turned on and the writing keeper pin WP is grounded. At this time, even if the power supply 2 of the microprocessor stops supplying power, the memory unit 11 can be normally read and written. In order to float the pin, the pin of the connection unit of the experimental platform corresponding to the detection pin of the D-sub (108) must be removed. In FIG. 1, the switching unit 104 can be replaced by other circuits, as long as the circuit can protect the write to the reference potential when the second mode is operated, and can write the control of the WP when the first mode is operated. The right is returned to the microprocessor 106. The intrusion protection control device proposed by the invention is not limited to the application of the audio-visual electronic system, but can also be applied to other kinds of electronic systems: the second _ 叨 叨 其 5 5 5 5 5 5 The Ray 7 system of the control method can be applied to the technology of the present invention, and any electronic system of the present technology belongs to the scope of the present specification. 0535-A21333TWF(N2); A05599; GLORI〇US 12 200807436 [Simplified Schematic] FIG. 1 is an embodiment of the present invention. [Main component symbol description] 102~Detecting pin position; 104~Switching unit; 106~Microprocessor; 108~D-sub; _110~memory unit; 112,114~power terminal; 116,118~D- Sub pin; power supply provided by the host connected to powerl~D-sub(108); power2~ power supply used by microprocessor 106;

Rl, R2, R3 ~ first, second, third resistance; Q1 ~ transistor; Z1 ~ back nano diode. * 0535-A21333TWF(N2); A05599; GLORIOUS 13

Claims (1)

200807436 X. Patent application scope: ^ A write protection control device for controlling the write protection function of the memory unit, wherein the write protection control device comprises: 'a connection unit having a detection pin position; a / knife changing unit, coupled between the detecting pin and the memory unit - into a chat; and Μ at a early element, lightly connected to the writing system foot; a = 1 'When the detection chat bit is in the -state state, the switching unit uses the same material 3^ as 'this time'. If there is power supply to the processing unit, the protection pin is processed by the processing unit. The detection pin is in the second shape (four), and the switching unit operates in the second mode. At this time, if the power supply is not supplied to the processing unit S, the writer protection pin is controlled by the switching unit. On the other hand, if there is a state in which the packet source is supplied to the processing unit, the write protection pin is controlled by the processing unit. ~", the profit protection range mentioned in item 1 of the protection protection device, = Wu Zaofan includes - switch, the switch is located between the writer protection pin and a wheat L, when the switch single μ the first mode ^ In the second mode of operation, the switch is turned on and the write protection pin is connected to the reference. The write protection pin is connected to the reference ^, ^' Normal reading and writing. Cheng Yu early can be replaced by the Gans ^ ^ as the patent of the Chinese patent for the second-party patent, the control system F m, p and the connection to the debt, the switch is a transistor, the switching unit The second resistor and the third resistor are respectively included in the second resistor and the third resistor, and the third resistor is 0535-A21333TWF (N2); A05599; GLORIOUS 14 200807436 is between the pin and the base of the transistor. The first end is coupled to a power source, and the second end of the second resistor and the second end of the third resistor are respectively coupled to the collector of the transistor and the detecting pin, the collector and the emitter of the transistor The write protection pin and the reference potential are respectively coupled. 4. The write protection control device according to claim 3, wherein the switching unit further comprises a Zener diode, and the anode and the cathode of the Zener diode are respectively coupled to the reference potential and the Detector Measuring foot position. 5. For example, the write protection control device described in the 2nd article of the Instinct, _ wherein the reference potential can be a ground terminal (gTOUnd). 6. The write protection control device as described in claim 2, wherein the detection pin is coupled to the reference potential and is in the second state when the first pin is floating. ..."Bei 4 7 · The write protection control device described in item i of the patent application scope, wherein the shouting is as long as an electronic erasable programmable read-only memory. The write protection control device described in the above item may be disposed in an electronic system, and the electronic system may be an image display device or a video display device, and the connection unit may be a D_sub, a digital visual interface connection. Or a high-resolution multimedia audio and video terminal. 9. A write protection control method for controlling the write-storing function of a memory unit, including _detecting a pin, a switching unit, and a genre a write protection pin and a processing unit, the method comprising: - when the detection pin is in a floating state and no power is supplied to the processing unit 7G, the write protection pin is connected to the switch unit by the switching unit A reference lightning position, so that the fresh element can still be read and written, wherein the write protection pin ^ 0535- A21333TWF (N2); A05599; GL 〇 R1 〇 US 200807436 when the potential is equal to the reference potential, the memory unit Can be read and written; and t the side When in the floating state and power is supplied to the processing unit, the write protection pin is controlled by the processing unit to determine whether to read or write the memory unit. 10. Write as described in claim 9 The protection control method, wherein when the test pin is connected to a reference potential and a power supply is supplied to the processing unit, the write protection pin is controlled by the processing unit to determine whether to read or write the memory unit. The write protection control method described in claim 9 of the application for profit detection, which further includes a connection unit, which is connected to a computer system, and the detection pin is disposed on the connection unit. The write protection control method of claim 9, wherein the switching element comprises a transistor, a first resistor, a second resistor, and a second resistor, wherein the first resistor is connected to the detection pin The first end of the second resistor and the third resistor are coupled to the main power source, and the second end of the second resistor and the second end of the third resistor are respectively coupled to the book. The collector of the crystal Detecting a pin, the collector and the emitter of the transistor are respectively coupled to the write protection pin and the reference potential. 13· The write protection control method described in claim 12 of the patent can be floated Connecting the detection pin to turn on the transistor to connect the write protection pin to the reference potential. The write protection control method according to claim 9, wherein the reference potential is a ground Ground. 0535-A21333TWF(N2);A05599;GLORiOUS 16