SU789986A1 - Information input arrangement - Google Patents

Description

The invention relates to digital computing.

Known devices for inputting information designed to transmit binary signals received 5 from external devices to a device for processing these signals, for example, to a digital computer, and usually containing buffer elements of memory [1 |.

A device for entering information containing input triggers for the number of inputs of the device [2].

The disadvantage of this device is the lack of reliability due to the construction of input triggers on two-input NAND elements with additional resistors and the need to use two input contacts of the device to connect each information source.

The purpose of the invention is to increase the reliability of the device.

This goal is achieved by performing input triggers on non-inverting elements with inputs and outputs closed through key elements. The outputs of the device are connected to the inputs of the And element, the output of which is connected to the synchronizing input of the mode trigger and through the pulse generator to the information input of the mode trigger and one of the device outputs, while the output of the mode trigger is connected to the control inputs of the key elements, the second inputs of which are connected to the inputs and outputs of the device.

In FIG. 1 shows a structural 10 diagram of a device for inputting information; in Fig.2 - an example of constructing a device for entering information on the logical elements of a standard series of microcircuits made according to CMOS (5 technologies.

Device for entering information _; contains input triggers made on non-inverting elements 1; inputs and outputs — of which are combined 20 through key elements 2, element And 3, pulse shaper 4 and mode trigger 5, made, for example, in the form of a D-trigger. The inputs 6 of the device are simultaneously the outputs of the device and are connected to the inputs of the corresponding elements 1, to the key elements 2 and to the inputs of the element And 3. The output of the element And 3 is connected to the synchronizing input of the trigger 5 mode and, through the pulse shaper 4, with the information input of the trigger 5. mode, as well as with the output 7 of the device, which is designed to transmit a trigger signal of subsequent devices, in FIG. 1 are not shown. The trigger output of mode 5 is connected to the control inputs of all key elements 2 ..

The AND function is implemented on the AND-NOT element 8 and inverter 9 of FIG. 2. The pulse shaper 4 is made on the D-flip-flop 10, the key element 11 and the JC-circuit 12. Input 13 is the reset input of the trigger 10.

The device for entering information operates in two modes:

- in the mode of low-speed input of information from mechanical contact devices, for example, from the key register;

- in input mode from high-speed information sources.

In the first mode, the device filters out interference caused by the bounce of mechanical contacts and generates a trigger signal for subsequent devices. In the second mode, a trigger signal is also generated, but the input signals are not filtered. The indicated modes are determined by the state of trigger 5: in the first mode, a logic unit signal is constantly present at its output, in the second, a logic zero signal; Switching a trigger from one state to another occurs automatically, depending on the frequency of the input signals.

In the first mode, the signal of a logical unit coming from trigger 5 to the control inputs of key elements 2 opens them, which leads to the closure of the inputs and outputs of non-inventing elements · 1, as a result of which each of them starts to operate in a single-phase trigger with control by; output . This ensures reliable suppression of the bounce of the contact switches of the input signal sources, since when the point 6 is touched for the first time on a bus with a high or low potential, the corresponding element 1 with the input and output closed through the key 2 remembers this potential and maintains it at point 6, regardless of whether it is closed or the mechanical contact of point b c is temporarily cut off due to bounce. potential tire. In the mode of increased frequency of accesses, the logic zero signal coming from trigger 5 to control the inputs of the key elements 2 closes them, the feedbacks between the inputs and outputs of the elements 1 open, the outputs of the elements 1 are isolated from the high-frequency potential inputs .6, i.e. Elements 1 are protected against overloads.

Trigger state is controlled by circuit 6-3-4. Suppose that in the initial state all inputs 6 are connected to a bus with a high potential (potential of a logical unit) and trigger 5 of the mode is in a single state. In the process of disconnecting input b using a mechanical switch from a bus with a high potential and connecting to a bus with a low potential, the switch break mode temporarily arises and a high potential at the corresponding input is maintained only due to the input trigger on elements 1-2. At the first contact of the switch armature with the low potential bus at point 6, as described previously, low potential is detected. At the same time, for a time equal to the propagation delay of the signal through element 1, element 1 operates in the output short circuit mode (this mode is permissible for low-speed input of information). The negative front of the input signal, passing through the And 3 element, starts the negative pulse shaper 4, the leading edge of which coincides with the negative edge of the triggering signal up to the shaper's own delay, and the trailing edge is determined by the shaper timing circuit 4. The parameters of the timing circuit are selected in such a way so that the pulse duration at the shaper output is less than the duration of the input signal from the mechanical switch. If this condition is met, then after the switch returns to its initial state, the positive edge that occurs at input 6 passes through the And 3 element, enters the trigger input of the trigger 5 and records the logical unit from the information input (shaper output 4), thereby confirming the original trigger state.

In the mode of increased frequency of accesses, the duration of the 'pulse at the output of the shaper 4 exceeds the duration of the pulse at input b, which leads to the switching of the trigger’5 mode to the zero state, which is subsequently confirmed with each appeal to the inputs of the device rib.

Using the proposed device can reduce equipment costs with a sufficiently large number of input channels K, for example, when K »8.

Claims (2)

This invention relates to digital computing. Information input devices are known that are intended to transmit binary signals from external devices to a device for processing these signals, for example, a digital computer and usually containing buffer elements of PS1m 1. A device for inputting information is known, which contains input triggers according to the number of inputs of device 2. A disadvantage of the device is not sufficiently high reliability due to the construction of input triggers on two-input AND NOT elements with additional resistors and the need to use two device input contacts to connect each information source. The purpose of the invention is to increase the reliability of the device. This goal is achieved by executing input triggers on non-inverting elements with inputs and Btuco closed through key elements. The outputs of the device are connected to the inputs of the element I, the output of which is connected to the clock input of three mode modes and, through a pulse shaper, to the information input of the mode trigger and one of the device outputs, while the output of the mode trigger is connected to the control inputs of the key elements, the second inputs which are connected to the inputs and outputs of the device. FIG. 1 shows a block diagram of an information input device; in fig. 2 illustrates an example of constructing a device for inputting information on the logic elements of a standard series of microcircuits, developed using CMOS technology. A device for entering information; contains input triggers; they are made on non-inverted elements 1; the inputs and outputs. Which are connected through the key elements 2, the element And 3, the pulse shaper 4 and the trigger 5 mode, made, for example, in the form of a D-flip-flop. Inputs 6 of the device are simultaneously the outputs of the device and are connected to the inputs of the corresponding elements 1, to the key elements 2 and to the inputs of the element AND 3. The output of the element 3 is connected to the synchronizing input of the mode trigger 5 and, through the shaper 4, impulse With the information input trigger 5.rzhim, as well as with the output 7 of the device which is designed to transmit a trigger signal to subsequent devices. in fig. 1 not shown. The output of the trigger 5 of the mode is connected to the control inputs of all the key elements 2 Functions AND is implemented on the element IS-HE 8 and the inverter 9. 2 Pulse shaper 4 is made on D-flip-flop 10, key element 11 and RC is circuit 12, Input 13 is the input of resetting flip-flop 10. The device for information input operates in two modes: - in the mode of low-speed information input from mechanical contact devices, for example from the key register in input mode from high-speed information sources. In the first mode, the device provides filtering of noise caused by the bounce of mechanical contacts, and the generation of a trigger signal for the following devices. In the second mode, a trigger signal is also generated, but the input signals are not filtered. These modes are determined by the state of trigger 5; in the first mode, a logical unit signal is constantly present at its output, in the second mode, a logical zero signal; Switching the trigger from one state to another occurs automatically, depending on the frequency of the input signals. In the first mode, the signal of the logical unit coming from trigger 5 to the control inputs of key elements 2 opens them, which causes the inputs and outputs of noninventing elements 1 to close, and as a result each of them starts to operate in the single-phase trigger mode : vyhrdu. This ensures reliable damping of the chattering of the contact switches of the input sources, since when the point 6 is first touched to the bus with high or low potential, the corresponding element 1 with closed cue 2 input and output remembers this potential and supports it at point 6 regardless closed or temporarily broken due to rattling. mechanical point contact 6 s. potential binaries. In the mode of increased frequency of calls, the logical zero signal coming from trigger 5 to control inputs of the key 1X elements 2, closes them, feedbacks between the inputs and outputs of elements 1 are opened, the outputs of elements 1 are isolated from the high potential inputs .6 . Elements 1 are protected from overloads. The trigger state is controlled by a 6-3-4 circuit. Suppose that in the initial state all the inputs 6 are connected to the bus with a high potential (the potential of the logical unit) and the trigger 5 of the mode is in the single state. In the process of disconnecting input 6 using a mechanical switch from a high potential bus and connecting to a low potential bus, a switch breaker mode temporarily occurs and the high potential at the corresponding input is maintained only by the input trigger on elements 1- 2. At the first contact of the core of the switch with the low potential bus at point 6, as described earlier, a low potential is fixed. In this case, for a time equal to the delay of signal propagation through element 1, element 1 operates in the output short circuit mode (this mode is valid for low-speed input of information). The negative front of the input signal, passing through the element 3, triggers the negative pulse 4 driver, the leading edge of which coincides with the negative edge of the trigger signal with an accuracy of the driver’s own delay, and the leading edge is determined by the driver circuit 4 of the driver circuit. so that the pulse duration at the output of the imager was less than the duration of the input signal from the mechanical switch. If this condition is fulfilled, after returning the switch to the initial state, the positive edge appearing at input 6 passes through the AND 3 element, arrives at the synchronizing input of trigger 5 and records the logical unit from the information input (output of the driver 4), confirming that the initial state of the trigger. In the mode of increased frequency of appeals, the pulse duration at the output of shaper 4 exceeds the pulse duration at input b, which leads to switching of the mode trigger5 to the zero state, which is further confirmed with each access to the device inputs. The use of the proposed device allows reducing equipment costs with a sufficiently large number of input channels K, for example, with K 8. Claims of the invention — A device for veod information containing input triggers on the number of device inputs, differs from that in order to increase reliability, input triggers are made on non-inverted elements with inputs and outputs connected to key elements, device inputs are connected to inputs of the element I, the output of which is connected to the trigger input of the mode trigger and through the pulse shaper to the information input of the mode trigger and to one of the device outputs with the output “Mode trigger is connected to control inputs of key elements, the second inputs of which are connected to the inputs and outputs of the device. Sources of information taken into account in the examination, 1. Katzan G. Computing data1 | 370.M., Mir, 1974 c.40-45i .2. Electronics, 1977, T1, No. 17, p. 58 (prototype). b te