SU1078657A2 - Start-stop synchronizer of slave station calls - Google Patents

Abstract

START-UP CHRONIZER OF THE SESSIONS OF THE SLAVE STATION ON AUT.St. No. 661832, characterized in that, in order to improve the accuracy of the reference of the start of the first working cycle of the chroniser to the starting pulse without increasing the frequency of the clock generator, the series-connected AND element, the trigger and the OR element, as well as the delay element are introduced into it to the reset input of the trigger, and the input of the delay element is connected to the first bit: the output of the clock counter; with the Decoders and the second input of the OR element, while the first input of the AND element is connected to the output of the detector of the most common siggsha, and the second input - to the inverse output of the start stop switch.

Description

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The invention relates to telecommunications,

According to the main author, 661832 the start-stop chronies of the slave station sessions, the serially connected address signal detector, the start-stop trigger and the pulse counter with decoders are known, the counting input of which is connected to the clock generator, the serially-connected register and the OR-NOT element as well as the counter trigger pulses with decoders and a block of elements AND-OR and the outputs of the counter of starting pulses with decoders are connected to the inputs of the register, the outputs of which are connected to the input I-OR units, the other inputs of which are connected to the clock counter outputs with decoders, the first bit output of which is connected to the setup input of the starting pulse counter with decoders, the counting input of which is connected to the output of the address signal detector, and the output of the AND-OR element block connected to the reset input of the register and another input of the start-stop trigger, the output of the element OR is NOT connected to the corresponding input of the block of elements AND-OR Cl J.

A disadvantage of the known start / stop chronizer of the slave station sessions is the dependence of the synchronization accuracy of the start of the first operating cycle of the communication session on the frequency (period) of the clock pulses produced by the clock pulse generator. To increase the synchronization accuracy of the beginning of the first working cycle, it is necessary to reduce the period (increase in frequency) of the clock pulse generator and, as a result, increase the number of counter bits, i.e. complication of the whole device, although in many cases the chroniser is required to synchronize the remaining work cycles and the entire sequence diagram of the communication session as a whole.

The purpose of the invention is to improve the accuracy of the reference of the start of the first working cycle of the chroniser to the starting pulse without increasing the frequency of the clock generator.

This goal is achieved by the fact that the start-stop chronizer of the slave station sessions containing the serially connected address signal detector, start-stop trigger and clock counter with decoders, the counting input of which is connected to the clock generator, are serially connected to the register and the OR-NOT element, as well as the counter of starting pulses with decoders and the block of elements AND-OR, and the outputs of the counter of starting pulses with decoders are connected to the inputs of the register, the outputs of which are connected to the inputs of the block of AND-OR elements, the other inputs of which are connected to the outputs of the clock counter with decoders, the first bit output of which is connected to the installation input of the counter of starting pulses with decoders, the counting input of which is connected to the output of the address signal detector, the output of the block of elements I- OR connected to the reset input of the register and another input of the start-stop trigger, the output of the element OR is NOT connected to the corresponding input of the block of AND-OR elements, the series-connected element AND is entered, three the hero and the OR element, as well as the delay element, the output of which is connected to the trigger reset input, and the input of the delay element are connected to the first bit output of the clock counter with decoders and the second input of the OR element, while the first input of the AND element is connected to the output of the address detector signal, and the second input to the inverse output of the start / stop trigger.

FIG. 1 is a block diagram of the start-stop chronizer of the slave station in FIG. 2 epures on his work.

The start-stop chronizer of the slave station sessions contains a detector of 1 address signal, a start-stop trigger 2, a generator of 3 clock pulses, a counter of 4 clock pulses with decoders 5, a counter of 6 trigger pulses with decoders 7 a register 8, a block 9 of AND-OR elements, an element OR-NOT 10 , Element 11, trigger 12, Element OR 13, and Element 14 Delay.

The device works as follows.

The clock pulse generator 3 runs continuously and outputs 4 counts to the counting counter input clock with a period T (FIG. 2a). At some instant tjj, when the address signal arrives at the slave station, the detector 1 produces a starting pulse (FIG. 25), including start-stop trigger 2, after which counter 4 starts counting clock pulses. At the output of the decoder 5, the signal of the first working cycle of the communication session is wired with some random delay G relative to the moment i, moreover (FIG. 2c), at the moment the first pulse pulse (after starting) arrives at the counter 4 from the generator 3, simultaneously with the start-stop the trigger 2 at the time to to through the element 11 on the second input of which there is an enabling signal from the inverse output of the start-stop trigger 2 switches on the trigger 12 (fig. 2i) and through the element OR 13 an additional output goes to the external control device a first working stroke (Figure 2d.) - without delay time with. After a time interval i, when the signal at the output of the (first) decoder 5 is turned on, the trigger 12 is reset through the element 14 through the OR element 13 and the main signal of the first operating cycle arrives at the output. Element 14 provides a reliable overlap in time of the signal from the output of the trigger 12 and the main signal from the output of the (first) decoder 5, which guarantees the continuity in time of the signal of the first operating cycle. Element I 11 operates the trigger 12 only at those times when the start-stop trigger 2, and with it the entire start-stop chronizer of the slave station sessions, is in standby standby mode.

This protects the clock signal of the first clock cycle from false positives. SRI of trigger 12 from false or second-time signals arriving at detector 1 at an interval of time after the end of the first operation cycle, but before the end of the session and the reset of the start-stop trigger 2

Further, the start-stop chronizer of the slave station sessions works in the same way as the prototype. Counter 6 counts the actual number of address signals arriving at detector 1 during the first operating cycle — the receive cycle. In decoders 7, this number is compared with a set of threshold numbers. A specific range of values of the actual number of starting pulses is fixed by the corresponding cell of register 8, the signal from the output of which goes to the first input of the corresponding section of block 9 AND-OR elements. The second input of this section receives a signal from the output of one of the decoders 5, thereby resetting the start-stop trigger 2 the signal from the output of block 9 is carried out the earlier, the smaller the actual number of received address signals (as compared with the known fixed number of such signals transmitted by the master station Communications) network. The element OR-NOT 10 works when only one first address signal arrives and no number is recorded in the cells of register 8.

Technical and economic effect from. the application of the invention consists in increasing the accuracy of the reference of the beginning of the first operating cycle to the starting pulse by eliminating the dependence of the accuracy of the reference from: the terminal of the frequency of the generator of clock pulses.

Claims (1)

STARTSTOP CHRONIZER ’SESSIONS OF A SLAVE STATION No. 661832, characterized in that, in order to increase the accuracy of linking the beginning of the first working clock cycle to the trigger pulse without increasing the frequency of the clock generator, series-connected AND elements, a trigger and an OR element, as well as a delay element, are introduced into it the output of which is connected to the trigger reset input, and the input of the delay element is connected to the first bit (output of the clock counter ·; with decoders and the second input of the OR element, while the first input of the AND element is connected to the output of the address detector of the second signal, and the second input - to the inverse output of the start-stop trigger. <1 cl