SU736089A1 - Device for converting table codes - Google Patents

Description

The invention relates to the field of automation, computing and information transfer, and can be used for two-way conversion of codes defined in binary form by tables of mutual correspondence. Code converters are known that contain separate matrices and logic elements 1 for each group of codes. The disadvantage of such devices is their complexity. The closest to the invention in its technical nature is a device for converting tabular codes containing a comparison circuit and two groups of information buses 2. The drawbacks of the device are the complexity of its design, due to the presence of encoders for storing full sets of code combinations of tables of mutual correspondence, as well as the impossibility of converting the codes of three or more tables of mutual correspondence. The purpose of the invention is to simplify and expand the functionality of the device. This goal is achieved by the fact that the device additionally contains a second comparison circuit, elements AND, OR, a pulse generator and two similar code conversion blocks, the first groups of inputs of which are connected to the corresponding groups of information buses of the device, the first groups of outputs to the inputs of the first and second comparison circuits The inverse outputs of which are connected respectively to the inputs of the first and second elements I, the other inputs of which are connected to the inputs for selecting a pair of corresponding tables, and the inverse outputs to the inputs the OR element, the inverse output of which is connected to the first switching inputs of the code conversion blocks, the second switching inputs of which are connected to the output of the pulse generator, and the third to the conversion direction selection inputs of the second output groups of the code conversion poles, and the outputs of the device that the code conversion unit comprises a counter, a decoder, and a switching element, with the bit inputs of the counter; And they are connected to the device information bus group, and the outputs, the inputs to the decoder inputs and the device outputs, the decoder outputs are connected to the inputs of the comparison circuit, the first, second and third inputs of the switching element are connected to the corresponding inputs of the code conversion unit, and the output is connected to the input counter.

FIG. 1 is a block diagram of a device for converting table codes (an embodiment for two-pair tables); in fig. 2 is a block conversion circuit diagram; FIG. 3 is a comparison circuit.

The device contains blocks 1 and 2 of conversion codes, a generator of 3 pulses, the first and second circuits 4 and 5 of comparison, the element OR 6, the first and second elements AND 7 and 8, and the groups IN (legal buses 9 and 10, the first 11, 12 and the second 13, 14 groups of outputs of the conversion code blocks, inputs 15 and 16 for selecting the direction of the conversion, inputs 17 and 18 for selecting a pair of matching tables. The code conversion block circuit comprises a counter 19, a decoder 20, a switching element 21.

The comparison circuit contains two-input elements And 22, 23 and 24, a resistor 25 / terminal 26 of the power supply.

The diagram in figure 1 is presented for two pairs of tables of mutual correspondence (for example, A and B, D and E).

In this embodiment, input 17 (the command is taken to select a pair of tables AB, and input 18 is a D-E.

From the inputs 15 or 16, the direction of the conversion is selected, for example from A to B or B to A and so on.

Table code converter works as follows.

The convertible (predetermined) code of table A over tires 9 is fed in parallel to the inputs of the counter 19 of block 1 and is stored in the latter. Signal Allow A. (conversion direction command) confirming the presence of a code on buses 9 enters input 16 to the input of the switching element 21 of block 2, allowing pulses from the generator to pass through element 21 of block 2 to the input of counter 19, increasing its binary code by one each pulse. Thus, a complete set of codes for the desired table B. is created.

From the outputs of the counter 19 of block 1, the binary code of table A is fed to the inputs of the decoder 20 of block 1, which converts. binary code in unit position, i.e. excites one of the 2 outputs of the decoder.

With the output of the counter 19 of block 2, the generated binary code of table B is fed to the inputs of the decoder 20, which converts the binary code to

single position, i.e. excites one of the 2 outputs of the decoder.

Each output of the decoder 20 block

1 is connected to one input of one of

2 two-way elements AND of the comparison circuit (FIG. 3), the second input of which is connected to the corresponding one of the 2 outputs of the decoder 20 of the block 2.

For example, convert the code 0110100 of the letter T of table A into the code 1001101

tables B. Code 0110100

letters

letters T of table A, arriving with tyus 9 to the input of counter 19, block

1 is stored in the counter. From the outputs of the counter 19 of block 1, the code 0110100 of the letter T of table A is fed to the inputs of the decoder 20, and the block 1 is excited

2-f 2 + 2 52 output of the decoder 20 block 1.

The code 1001101 of the letter D of Table B is created as follows.

Since the codes of table A are accompanied by the Allow A signal (conversion direction), then through the switching element 21 of block 2, the counting input of counter 19 receives pulses from generator 3, increasing its content by one. If the counter 19 of block 2 is preset to O, then the 77th pulse received at the input of the counter 19 of block 2 will have the value 1001101, which corresponds to the code of the letter g of table B. If the counter 19 of block 2 is not preliminarily installed in O, then one of 2 pulses received at the input of the counter, the latter takes the value 1001101.

Since each value of the counter 19 of block 2 by the decoder 20 of block 2 is converted into a unit-position form, i.e. One of the 2 decoder outputs is energized, then the code value. 1001101 at the outputs of the counter 19 of the block 2 excites the 77th (2- + 2 + + 2 + 2) output of the decoder 20 of the block 2.52-th. Output of the decoder 20 of the block 1 is connected to one input of one of the 2 valves, for example 52, the second the input of which is connected to the 77 output of the decoder 20 of block 2.

The peculiarity of the proposed converter consists of 3 that each value of the code of table A corresponds to the excited state of one of 2 outputs of the decoder 20 of block 1, and each value of the code of table B - one of 2 outputs of the decoder 20 of block 2, and the outputs of the decoders are connected to the inputs of two-input elements And comparison schemes based on correspondence tables.

When two inputs are energized, one of 2 elements And at the output of the comparison circuit 4 a comparison signal appears, prohibiting further passage of pulses from the generator

through the element 21 of the block 2 to the input of the counter 19 of the block 2. Thus, at the outputs of the counter there remains that code at which the comparison signal was generated.

From the outputs of the counter 19 of block 2, the converted code of table B is outputted via buses 14,

The inverse transform, i.e. The conversion of the code of table B to the code of table A differs only in that the converted code of table B is fed to the inputs of counter 19 of block 2 At 10, accompanied by a signal of Split B (direction of conversion) and the full set of codes of ggablitsy A is created by the counter 19 of block 1 s using pulses from the generator 3, coming through the switching element 21, and the codes of table A are removed from the outputs of the counter 19 of the block 1 via the buses 13.

Converting the codes of another pair of tables, for example L-E (possibly more pairs of tables), is different in that the Select E-E command is fed to input 18, allowing the code comparison signal from the output of the second comparison circuit 5 to pass.

Compared with known converters, the proposed table code converter has a simpler design due to a decrease in the storage capacity to 2x n binary characters (n is the binary code size) instead of xn binary characters in known converters.

Claims (2)

1. A device for converting table codes containing a comparison circuit and two groups of information buses, characterized in that. that, in order to simplify and expand the functionality of the device, it additionally contains a second comparison circuit, AND, OR, pulse generator and two unaccountable code conversion units, the first groups of inputs of which are connected to the corresponding groups of device information buses, the first groups of outputs — inputs first and the second comparison circuit, inverse. the outputs of which are connected respectively to the inputs of the first and second elements AND, the other inputs of which are connected to the inputs of selecting a pair of matching tables, and the inverse outputs to the inputs of the OR element, the inverse output of which is connected to the first switching inputs of the code conversion blocks, the second switching inputs of which are connected with 0 by the output of the pulse generator, and the alarm is routed to the inputs neither the transform, the second output groups of the code conversion block are the outputs of the device. 2. The device according to claim 1, characterized in that the code conversion unit contains a counter, a decoder and a 1-meter element, the discharge inputs of the counter being connected to the group of information buses, the device, and the outputs to the inputs of the decoder. And the outputs of the decoder, the outputs of the decoder connected to the inputs of the comparison circuit, first, second and third inputs of the switching element 35 are connected to the corresponding inputs of the code conversion block, and the output to the counter input. Sources of information taken into account in the examination of 40 1. USSR author's certificate 327471, cl. G 06 F 5/00, 1970. 2. USSR author's certificate No. 410387, cl. G 06 F 5/02, 1972. ig.1 fPu.2 5.