SU1256194A1 - Device for separating input pulses of forward-backward counter - Google Patents

Abstract

The invention relates to a pulse technique and can be used in a number of devices. The purpose of the / J invention is to increase speed. The device contains an element And 3, elements AND-NOT 5 and 6, the trigger 7,8 and 9 and the element 11 of the delay. The damage of the formers 1 and 2 of the pulses, the element 4 and the delay element 12 with the formation of new functional connections allows for the receipt of an unequal number of pairwise overlapping input pulses at the output of the channel on the input bus 13 and 14 at the input one pulse is more, to form one pulse, and at the output of another channel there are no pulses. 2 il .. (L

Description

25

11256194

The invention relates to a pulse technique and can be used in measuring devices.

The aim of the invention is to increase speed .5

Fig. 1 shows the structure of the device, Fig. 2 shows temporary diagrams explaining its operation.

The device contains the first 1 and O second 2 pulse shapers, the element And 3, additional element 4, the first 5 and the second 6 elements AND-HF, the first Tu second 8, third 9 triggers, element OR 10, the first. 5 delay element 11, second delay element 12, first 13 and second 14 input buses, first 15 and second 16 output buses. The input buses 13 and 14 are connected respectively to the 20 inputs of the element I 3 and through the elements 11 and 12 of the delay to the inputs of the formers 1 and 2 of the pulses, which form a pulse along the trailing edge of the input pulse. The output of element 3 is connected to the input of the installation in 1 of the trigger 7, the direct output of which is connected to the first input of the additional element 4, the second, third and fourth inputs of which are connected respectively to the direct outputs of the flip-flops 8 and 9 and to the output element OR 10. The output of the element AND 4 is connected to the input of the installation in About the trigger 7, the inverse output of which 35 is connected to the first inputs of the elements - AND-NOT 5 and 6 and the triggers 8 and 9. The outputs of the formers 1 and 2 pulses are connected respectively to the second inputs elements and NOT 5 and 6, to the second 0 inputs trigger Ditch 8. and 9 and to the inputs of the element OR 10. The outputs of the elements AND-NOT 5 and 6 are connected respectively to the output buses 15 and 16,

The device works as follows 45 times.

In the initial state, the trigger 7 by the reset pulse (not shown) is set to the zero state. In this case, the high potential of the inverse output of the trigger 7 supplied to the first inputs of the triggers 8 and 9, the latter are also set to the zero state. The element And 3 is closed by the low potential of the input 55 bus 13 and 14, the element And 4 is closed for all inputs, the elements AND-NOT 3 and 6 are open for the first inputs high

the potential of the inverse output of the trigger 7 and are closed by the low potential arriving at their second inputs from the outputs of the formers 1 and 2 pulses, respectively.

The input positive impulse from the bus 13 arrives at one input of the element I 3 closed at the other input by the low potential of the bus 14 and through the element 11 delayed to the input of the driver 1 pulses. The delay time of the elements 11 and 12 of the delay is equal to or slightly longer than the response time of the trigger 7. At the end of the input pulse (on the falling front), a polosh-geln pulse is generated at the output edge 1, which opens the element AND-HE 5, at the output of which A zero pulse arrives on the forward bus 15 of the direct count. The output pulse of the imaging unit 1 is also fed to the second input of the trigger 8, at the direct output of which a positive pulse appears (for the duration of the pulse at the trigger input), and through the element OR 10 to the fourth input of the AND 4 element, at the first and third inputs of which low potentials. Similarly, at the end of the positive input pulse on the bus 14 (on the falling edge), the output of the imaging unit 2 forms a positive impulse of duration t S - the opening element IS-НЕ 6, at the output of which a zero pulse arrives at the output bus 16 reverse account. The output pulse of the imaging unit 2 is also fed to the second input of the trigger 9, at the output of which a positive pulse appears, and through the element OR 10 to the fourth input of the element AND 4, the first and second inputs of which have low potentials.

Thus, at the end of the separate incoming input pulses on buses 13 and 14, forgruegots pulses of a & Respectively, on the output bus 15 of the forward counting or bus 16 of the counting back (FIG. 2, a portion).

If the input pulses coincide in time on buses 13 and 14 (FIG. 2, section I), element I 3 opens, the output pulse of which arrives at the first input of the trigger 7 and switches it (on a leading edge) into one

There is no condition. In this case, the low potential of the inverted output of the trigger 7 closes the AND-NOT 5 and b elements at the first inputs, and the high potential of the direct output opens the first input element I 4. At the end of the input pulses, pulses are formed at the outputs of the formers 1 and 2, which arrive at the second inputs, respectively, of the elements AND-NOT 5 and 6, closed on the first inputs.

At the same time, the impulse from the output of the imaging unit 1 enters the second input of the trigger 8 and switches it (on the leading edge) into a single state, opening the I 4 element through the second input, and the impulse from the output of the form mg-1ravel 2 switches to the single state trigger 9, opening the third input element And 4. The pulses from the outputs of the formers 1 And 2 also go to the I-UHi 10 element, the output signal of which opens the element And 4 and enters the second input of the trigger 7. After the pulse at the second input (on the back front) trigger 7 switches to zero A new (initial) state, with the high potential of the inverse output of the trigger 7 being opened at the first inputs of the elements AND-HE 5 and 6 and the triggers 8 and 9 are switched to the zero (initial) state.

Thus, after the end of the pulses coinciding in time on the input pnns 13 and 14 on the output ports 15 and 16, the t-pulses are absent and after a time equal to t, the circuit returns to the initial state. Therefore, if, after the simultaneous termination of the input pulses on buses 13 and 14 through the air, a few

- more, the second impulse will arrive.,

for example, from the bus 14, then at its end a pulse will be generated at the output of the driver 2, which will open the NAND element b, the output negative impulse of which will go to the counting bus 16 (figure 2, section Mi).

Consequently, the minimum interval between two successively incoming input pulses is equal to a value slightly exceeding 1, which ensures an increase in the upper frequency limit of operation and correspondingly

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The extension of the frequency range of work.

In section 1U (Fig. 3), the pulse on the input bus 14 overlaps with two consecutively received pulses on the bus 13. In this, when opening the element I 3, the trigger 7 switches to one state, the AND-HE elements 5 and 6 are closed and the at the first input, element 4. At the end of the first pulse on bus 13, the pulse from the output of shaper 1 switches the trigger 8 to one state. When the pulse on bus 14 ends, the pulse from the output of shaper 2 switches the trigger 9 to one. formir the paddle 2 passes through the OR 10 and AND 4 elements to the second input of the trigger 7. At the end of this pulse (at the falling front), the trigger 7 switches to the zero initial state, after which a high potential of the inverse output of the trigger 7 opens 5.and 6 and the triggers 8 and 9j are returned to the zero state. the circuit returns to its original state. Therefore, at the end of the second pulse on the bus 13, the generated pulse at the output of the driver 1 opens the AND-NE element 5, the output negative pulse of which is fed to the output bus 15 of the forward counting.

Thus, when the input buses of both channels receive unequal number of pairwise overlapping input pulses at the output of that channel, the input of which receives one more pulse, one pulse is formed, and at the output of the other channel there are no pulses.

Claims (1)

Invention Formula A device for separating the input pulses of a reversible counter, containing two input buses, three flip-flops, an AND element, a first delay element and two NAND elements, the inverse output of the first flip-flop being connected to the installation inputs in O of the second and third triggers and to the first input of the first element NAND, the output of which is connected to the first output bus, the output of the second element NAND is connected to the second output bus, characterized in that, in order to improve speed, two impulse drivers, a second element, are introduced into it The delay element and the additional element are And, the first and second input tines are connected to the corresponding inputs of the element And and through the first and second delay elements respectively to the inputs of the first and second pulse shapers, the output of the element And is connected to the installation input 1 of the first trigger, direct the output of which is connected to the first input of the additional element I, the second, third, and Editor I. Shulla Compiled by P. Smirnov Tehred A. Kravchuk Proofreader M. Demchik Order 4836/57 Circulation 816 Subscription VNIIPI USSR State Committee for inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab., 4/5 Production and printing company, Uzhgorod, st. Project, 4 2561946 the fourth inputs of which are connected to the direct outputs of the second and third flip-flops respectively and to the output of the OR element, the output of the additional AND element is connected to the input of the O device of the first trigger, the inverse output of which is connected to the first input of the second NO element, while exits first 10 and the second pulse shaper connected to the second inputs of the first and second elements, respectively, AND-NOT, with the installation inputs in 1, respectively, the second and third 15 triggers and or. element inputs