SU555440A1 - Memory device - Google Patents

Description

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The invention relates to storage devices (RAM) and can be used primarily in display devices of combined computing and television information and control systems, which require the joint display on one indicator of information coming from independent computing and television subsystems in various computing devices. , as well as in broadcast and applied television.

Memory devices used for storing information in display devices on electron beam tubes are known.

One of them, which is part of the device for editing and correcting text that is reproduced visually, contains a large capacity shift register, in a feedback loop of which a small capacity random-access memory is included with an input multitax data generator, the second input of which serves as an information input of a memory device. second register output

shear. Moreover, the addressing node located in the control and synchronization unit is common for the storage device and the user of the p-imaging unit.

A disadvantage of this device is the low reliability of operation in the composition of display devices of the combined computing and television information systems. When combining independent computing and television subsystems into a single information system, the source of synchronization for devices is an image. wives are television subsystems. However, due to the absence of corresponding blocks in the storage device, any external synchronization failures, such as those occurring when the master subsystem is switched, or when it malfunctions during operation, can lead to a violation of the one-to-one correspondence of the record-play addresses before the failure and after the failure.

Another known memory also contains a large capacity shift register. However, unlike the first one, it is equipped with an addressing unit that is separate with the consumer, the clock inputs of which are paralleled with the shift register inputs of the same size and connected to the generator via the special switch in the autonomous mode, and in the read mode to the output of the clock signals of the consumer. The switch is controlled from the consumer address and address unit. The presence of an autonomous power supply unit is a necessary but not sufficient condition for damping external synchronization failures. For this, it would be necessary at least to exclude the direct connection of the addressing unit and the shift register with the customer, or to provide for automatic recovery of correspondence of write-read addresses after a failure. However, in the device under consideration, this is not done. Directly sending the user clock signals to the synv- tots of the addressing unit and the shift register in read-only mode does not allow the use of an autonomous addressing unit to improve the reliability of the device. In addition, there is no disconnection with the consumer and the output of the device. The closest technical solution to the invention is the Videoton-340 television display memory, which contains the main drive (of the circulation type), the output of which through the intermediate drive is connected to the output of the device, the first input — to the first input of the device, the second input — to the output of the control unit connected with the second input of the device Z. Iv to this device, the correspondence between the physical addresses of the record-play drives and the current write addresses — the play of the addressing block is established only one Once at the moment the display is turned on, or by a special signal from the initial setup. When an address block or drives fail due to external synchronization failures, the specified correspondence may be broken, and there are no automatic recovery blocks. However, the device in question is better than the first two in the sense that it is equipped with an intermediate storage device installed at the output, which may well serve as a reliable element for decoupling the device with the consumer at the output. At the same time, its reliability can be increased by introducing additional isolation blocks with the consumer at the entrance. The purpose of the invention is to increase the reliability of the device. This is achieved by the fact that the device contains a recorder of replay signals, a trigger generator and an addressing unit connected through the trigger generator to the third inputs of the device and directly to the control inputs and switch of the recording-signal signals, the output of which is connected to the inputs of the intermediate accumulator, and the inputs are with the output of the control unit and with the fourth input of the device. Such a device provides complete protection of the recorded, stored and readable information from any user synchronization failures, including the disconnection of its sources and the consumer itself. The drawing shows the block-yhema device. The storage device contains the main storage device 1, for example, of the circulation type, the output of which is connected to the output of the device through the intermediate storage device 2. One input of the main storage device 1 is connected to the first input of the device, the other input is connected to the output of the control unit 3 connected to the second input of the device. In addition, it contains a record-play signal switch 4, a trigger signal generator 5 and an addressing unit 6 connected through the driver to the third inputs of the device and directly to the inputs of the control unit and switch 4, the outputs of which are connected to the inputs of the intermediate storage device 2, and with the output of the control unit 3 and the fourth input of the device. At the same time, the addressing unit 6 is made start-stop, and in order to ensure the continuity of data output to the consumer, intermediate storage device 2 is filled with two-channel one. When interacting with the consumer, the memory works as follows. The consumer has no direct access either to the main storage device 1 or to the addressing unit 6. In stationary mode of operation, the addressing unit 6 periodically falls into a stop (initial) state, in which it remains until the corresponding trigger signal is received. produced by the driver of the start-up signals 5 in response to a similar start-up signal received at the third input of the device from the consumer. If the accumulators are circulating and, as a consumer, an imaging unit of a television display device, then such signals are usually a two-start signal per frame and

trigger signal on the information line (in other cases, their nomenclature may be different). At the same time, the addressing unit 6 is designed in such a way that it can perceive a personnel trigger signal

if and only if it is on the cadre foot, and lower case - on the lower foot.

In the periods between the indicated stops, the addressing unit 6 cannot perceive any trigger signals and operates autonomously from the internal master oscillator completely ignored by the user. Due to this, the stop positions of addressing 6 are periodically checked and, if necessary, the initial correspondence between the addresses of the record (reproducing drives and addressing unit 6) is restored on the one hand, and the consumer addresses on the other. Obviously, if, for some reason, the address or trigger of the consumer fails, this failure will not perceive the memory, and for a time not exceeding the period of the personnel (senior) trigger signals, the address device 6 will stop at the frame stop and will be in this state until the addressing device of the consumer returns to the same state and the normal start signals come back from it. This protects the charger from any user synchronization failures and, accordingly, ensures its high reliability.

Data is received by the consumer through the intermediate storage device 2. In response to the perceived start signal, one of the channels of the intermediate storage device 2 is connected via switch 4 to the output of the main storage device 1, and the second to the device output. In this case, a regular portion of the data is recorded on the first channel, and the second is read to the consumer. Then, after receiving the following trigger signal, the indicated channels change roles. Then all the processes are repeated.

Similarly, the storage device is protected from data source synchronization failures if its trigger signals are also fed to the corresponding third inputs of the device.

However, the trigger driver 5 must respond to the input signals of the source and the consumer.

data in order of priority.

It should be noted that the foregoing remains valid also for cases where the accumulators are not circulating. In fact, when exchanging with accumulators of any physical nature, it is necessary to strictly observe the technical requirements for their use. Naturally, when external synchronization fails, these conditions may be violated, and the reliability of the memory in general will be low. The proposed technical solution to the damper mentioned failures, increases the reliability of the memory in these cases.

Comparative tests of this-RAM with known ones have shown that any failures in the work of the sources or consumers of the data do not reflect at all on the quality of its work. This allows it to be used not only in combined computing and television systems, but also in other devices that have increased demands on the reliability of storage devices.

Claims (3)

1. Patent USA №3706075, Кл.06РЗ / 14 1972 2. The UK patent number 1287310 Cl. U 11 from 19/00; 1972 3. Videoton-340, technical description, Hungarian People's Republic, 1972 (prototype).