RU2178594C2 - Method and device for data recording in nonvolatile memory unit - Google Patents

Abstract

FIELD: in-service on-line information storage and updating devices. SUBSTANCE: device has recording unit, read-out unit, comparison circuit, clock generator, write enable unit, loading resistor, two switches, and short-pulse shaper. Operation of said device is described in description of proposed method. EFFECT: enhanced reliability of recording data in nonvolatile memory locations. 5 cl, 1 dwg

Description

 The present invention relates to methods for recording in non-volatile memory and can be used in devices that use the storage and updating of operational information in the process of their work.

 Known operational storage device, including a recording unit, a reading unit and an address generating unit connected to a storage device (Explanatory Dictionary of Computing Systems / Edited by V. Illingworth and others: Translated from English by A.K. Belotsky and others. ; Under the editorship of E.K. Maslovsky. - M.: Engineering, 1989 .-- 568 p., P. 393, 394).

 The method implemented in the known device, allows you to record information for various systems that require storage of operational information.

 The disadvantage of this method is the presence of a high probability of loss of information when reducing the supply voltage, for example, due to the discharge of the battery when it is used as a power source. So, when the voltage is reduced to values that do not ensure reliable operation of the elements of digital microcircuits serving the non-volatile memory, distorted information can be recorded and stored in the cells of the non-volatile memory, due to the failure of any switching elements, which, ultimately, will lead to disruption of the system as a whole.

 The objective of the invention is to increase the reliability of the recording process in the cells of non-volatile memory.

 The technical result is to reduce the likelihood of recording distorted information while reducing the supply voltage, for example, when the supply battery is discharged.

 The specified technical result is achieved by the fact that in the method of writing to the non-volatile memory unit, which includes directly recording information at a given address, short-term shunting of a power supply having high internal resistance and a control recording of test information is carried out simultaneously simultaneously, then the test recording is compared with recorded test information and the results judge the need for recording information.

 In addition, the control recording is carried out by generating test signals, writing test signals to the cells of the tested non-volatile memory, and reading already recorded test signals.

 The device, for implementing the proposed method of recording in a non-volatile memory unit, includes a recording unit, a reading unit and an address generator connected to the corresponding inputs and outputs of the storage device, a comparison circuit, the first input of which is connected to the output of the reading unit, a test signal generator, the output of which is connected to the second input of the comparison circuit, the recording permission block, the input of which is connected to the output of the comparison circuit, and the output of the recording permission block is connected to the write / read control input a recording unit, a power supply with a high input impedance, a first switch and a load impedance, as well as a short pulse shaper, the output of which is connected to the input of the test signal generator, the control key of the first key, the outputs of the address generator are connected to the corresponding address inputs of the storage device, and the control input to the output of the short pulse shaper, the second key of which the first input is connected to the input of the device, the second to the output of the test generator with latter is present, and the output to the input of the recording unit, an output reading unit connected to an output device, the second switch control input coupled to the output of a short pulse generator.

 The invention is illustrated using the drawings, where the drawing shows a functional diagram of a device that implements the proposed method of recording information in a non-volatile memory unit.

 The method of recording in a non-volatile memory unit can be implemented as follows.

 When using power supplies with limited capacity, as they discharge, a decrease in the supply voltage occurs. To avoid loss of information in the event of a power failure or a significant decrease in voltage, the test information is recorded at predetermined addresses with simultaneous short-term shunting of a power source with high internal resistance before directly writing information to the storage device. In this case, due to shunting during the control recording, there is a short-term decrease in the supply voltage on the elements of digital logic, since the recording is accompanied by an increase in the consumption current. If the supply voltage becomes insufficient to make the necessary commutation, then the recorded test information is distorted in the storage device and then the distorted information is also read. The next operation is to compare the read information with the test. If there are no differences in the compared signals, then the working information is recorded in the storage device. If the read information differs from the test, that is, the one that was recorded at this address, then it is considered that it is impossible to record with a given state of discharge of the battery, and the working information is not recorded. In this case, the operating information recorded before continues to be stored in the storage device. The negative consequences of not updating working information in the storage device are preferable to recording distorted information, when the results of previous calculations may be completely lost.

 A device that implements the proposed method of recording in a non-volatile memory unit includes a recording unit 1, a reading unit 2 connected to the corresponding inputs and outputs of the storage device 3, a comparison circuit 4, the first input of which is connected to the output of the reading unit 2, test signal generator 5, output which is connected to the second input of the comparison circuit 4, the recording permission block 6, the input of which is connected to the output of the comparison circuit 4, and the output of the recording permission block is connected to the write / read control input of the recording block 1, p therefore, the connected power source 7 with a high input resistance, the first key 8 and the load resistance 9, as well as a short pulse shaper 10, the output of which is connected to the input of the test signal generator 5, the control input of the key 8, the address shaper 11, the outputs of which are connected to the corresponding address the inputs of the storage device 3, and the control input to the output of the short pulse shaper 10, the second key 12, the first input of which is connected to the input of the device, the second to the output of the test signal generator s 5, and the output - to the input of the recording unit 1, the reading unit 2 is connected to the output of the output device, the second switch control input coupled to the output of a short pulse generator.

 The device operates as follows.

 The short pulse shaper 10 at certain times generates control pulses by which the power supply 7 is short-circuited through a key 3 and a resistor 9, the test signal generator 5 is started briefly, the output signals go to the input of the comparison circuit 4 and through the second key 12 to the input of the unit records 1, and also formed addresses in the shaper address 11 for recording test information. The test information recorded in this way is also read from the output of the reading unit 2, arriving at the first input of the comparison circuit 4, where it is compared with the information received at its first input. If there is equality of the compared signals, a logical signal is generated at the output of the comparison circuit 4, on the basis of which an output signal is generated at the output of the write permission block 6 to the non-volatile memory unit 3. In the absence of equality of the compared signals, the write permission is not generated in the non-volatile memory block either previously recorded information continues to be stored.

 Writing information from the recording unit 1 to the non-volatile memory block 3 and reading from the latter to the reading block 4 is carried out through the inputs / outputs of the non-volatile memory block 3 connected to the output of block 1 and the input of block 2.

 The proposed method provides increased reliability of the recording process in the cells of non-volatile memory by reducing the likelihood of recording distorted information while reducing the supply voltage, for example, when the supply battery is discharged.

Claims (5)

 1. The method of recording information in a non-volatile memory unit, which consists in recording information at a specified address in a non-volatile memory unit, characterized in that, before the operation of recording information, simultaneously performed, short-term bypass power supply and control recording of test signals are carried out, test read signals, compare the read test signals with the recorded test signals, and if there are no differences between the compared signals, record Info.  2. The method of recording information in a non-volatile memory unit according to claim 1, characterized in that the control recording of test signals is carried out by generating test signals and recording test signals in a non-volatile memory block.  3. The method of recording information in a non-volatile memory unit according to claim 1 or 2, characterized in that they carry out short-term shunting of a power source having high internal resistance.  4. A device for implementing a method of recording information in a non-volatile memory unit, including a recording unit, a reading unit connected to corresponding inputs and outputs of a non-volatile memory unit having address inputs, characterized in that a comparison circuit is introduced into it, the first input of which is connected to the output a reading unit, a test signal generator, the output of which is connected to the second input of the comparison circuit, a recording permission block, the input of which is connected to the output of the comparison circuit, and the output of the recording resolution block connected to the write / read control input of the recording unit, a power supply, a first key and a load resistance connected in series, as well as a short pulse shaper whose output is connected to the input of the test signal generator and the control input of the first key, the second key, the first input of which is connected to the information the input of the device, the second to the output of the test signal generator, and the output to the input of the recording unit, the output of the reading unit is connected to the output of the short pulse shaper.  5. A device for implementing a method of recording information in a non-volatile memory unit according to claim 4, characterized in that the power source is made with high internal resistance.