DE3330049A1 - Serial tetrad adder/subtracter in BCD 8421 code - Google Patents

Abstract

Published without abstract.

Description

Paul Merkle ... · "-" - :: _: *: -. : Eschenbrünnlestr. 48

Sindelfingen .4 .. 3330049

Serial tetrad-adder-subtracter in the BCD-8421-Gode

The invention is a serial electronic tetrad add-subtracter in the BCD-84-21 code, the one Has tetrad adder-subtractor according to P 33 28 404-.0. The execution of additions is carried out in this serial tetrad-adder-subtracter made possible by an upstream adding circuit, which when controlled to the BCD number 6 (LHHL) is added to the relevant summand, what in reality at & w? Addition of 3 four-digit .BCD-O numbers are added together and if the correction circuit is activated, and the BCD number 6 '(LHHL) is subtracted again at the same time (with addition without tetrad carryover), The subtraction of the correction number 6 (LHHL) is therefore necessary here because the results are numbers should not be BOD-6 coded, but BCD-O coded should arise. In this case, the number 6 (LHHL) is first added to one of the two summands and then subtracted from the intermediate result sum again because the main circuit of the tetrad adder-subtracter 1 at Addition with raised input works in such a way that the sum of the two summands is raised by the number 6 (LHHL) have to be. In order to avoid long names, normal BCD numbers are used as BCD-O numbers in this description designated BCD numbers, which are raised by the number 6 (LHHL), are referred to in this specification as BCD-6 numbers. Accordingly, excess 3- · encoded BCD numbers referred to as BCD-3 numbers. The tetrads Adder-subtracter of this serial tetrad-adder-subtracter thus consists of 3 main parts, because the additional adding circuit for the number b (LHHL) is directly connected the inputs of the main circuit of the tetrad adder-subtracter 1 is arranged and thus a partial circuit of the tetrad adder-subtracter 1 is.

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In Figure 1, the serial tetrad-adder-subscriber unit.,

Type A shown and in Figure 2 the control circuit 3 ^,!

which the correction circuit of the tetrad adder-subtra-!

here controls 1. In Figure 3, the tetrad adder |

Subtractor 1 shown in its components and in j

Figure 4- the input circuit 2. In Figure 5 the serial ·

Tetrad-adder-subtracter type B shown and in ■

Figure 6 the control circuit 7 »which are then used can if this control circuit at one of its two

Inputs are not controlled by line a, but -

■ from line f. In Figure 7, the tetrad adder sub- ■ Tractor 8 shown in its constituent parts and in Figure

8 the input circuit 9. 'j

The serial tetrad adder-subtracter type A (Figure 1) has an input circuit 2, .which when controlled Number 6 (LHHL) added and a correction circuit 18, which: When activated, subtracts the number 6 (LHHL).

The serial tetrad adder-subtracter type B (Figure 5) has an input circuit 9 »which, when activated, the Number 10 (HLHL) subtracts if the corresponding correction tetrad carryover is not processed and thus on it Ways that add ^ ahl 6 (LHHL). Also, this has serial Tetrad-adder-subtracter type B a correction circuit 19 which, when activated, the number 10 (HLHL) adds the number (liälSi;) if the corresponding correction tetrad transfer is not processed and thus in this way (LHHL) subtracted.

The serial tetrad adder-subtracter type A (FIG. 1) consists in essential parts of the special tetrad adder-subtractor 1 and the input circuit 2 and the drive ^ circuit 3 and the carry memory 4 and the additional negative circuit 5 and the associated lines. The special tetrad adder-subtracter 1 consists of the main circuit 17 and the correction circuit 18 and the drive circuit 3. The main circuit 17 consists of the full adders-subtractors 31 to 3 ^ · the correction circuit 18 consists of the half subtracter 35 and the full

Subtracter $ 6 and the remainder circuit 37. The inputs have the designations A 1 to A 4 and B 1 to B 4. The result outputs G have the designations O 1 to C 4. The inputs A 1 and B 1 and the output C 1 have the value 1 « The inputs A 2 and B 2 and the output G 2 have the valency 2. The inputs A 3 and B 3 and the output C 3 have the value 4. The inputs A 4 and B 4 and the output G 4 have the value 8. When added, the B inputs are the Inputs for the first addend and the Α inputs the inputs for the second addend. With subtraction they are B inputs the inputs for the minuend and the A inputs the inputs for the subtrahend. The input circuit 2 consists of the half adder 45 and the full - "- dder 46 and the remainder circuit 47.

How the serial tetrad-adder-subtracter works Type A (Figure 1) results from adding as follows: The setting for addition is made by applying H potential to the input E. This controls the addition of the number 6 (LHHL) in the input circuit 2. Then it will be the first addend BGD-O-coded at the B inputs and the second addend BCD-O-coded at the A inputs. If the lines m and η are now connected to Η-potential, the outputs G BGD-O-coded have the potential series this addition result number, because in this case none Tetrad transfer departure by the correction circuit 18 at the same time the number fo is subtracted again and because im In the case of a tetrad carryover departure the number 6 is not subtracted and thus in this case the result number of the Main circuit 17 is not changed. So here is the number b (LHHL) is added to the second summand and then the first summand to this result sum. If no Tetrad transfer comes about is from the control circuit; -ung 3 the subtraction of the number 6 is controlled and thus the number fo is subtracted again by the correction circuit 18. If this results in a tetrad transfer, the result number of the main circuit 17 is reduced by the number 1b, whereby this result number is automatically generated by BGD-fa ' is umcodiert on BGD-O- and thus no subtraction of the

COPV j

Number (6) is required, including a BCD-O coded addition result number to receive.

With subtraction, the effect of this serial tetrad-adding-subtr - ihierwerKS Type A is as follows: The Setting to subtraction is done by applying L potential to input E. This is in the input circuit 2 the addition of the number 6 (LHHL) is not activated and thus the number 6 (LHHL) is not added to the subtrahend. The Minuend comes BOD-O-coded at the B-entrances to the system and the subtrahend is also only "BOD-O-coded" A-inputs. The subtraction then takes place in that the control lines m and η are connected to Η potential. If no tetrad carry occurs, the control circuit 3 has L potential at its output and is therefore the correction circuit 18 is not driven and the subtraction result number of the main circuit 17 is unchanged routed to the outputs G, which are therefore already is correct because here only one BCD-O-coded number from another BCD-O-coded number in the main circuit 17 is subtracted without falling below the number O (LLLL). If this results in a tetrad transfer, -Has the control circuit 3 at its output Η potential, whereby the correction circuit 18 is activated and thus simultaneously subtracts the correction number 6 (LHHL) will. In this case, the subtraction of the number 6 (LHHL) is necessary because the result number is the main circuit 17 through the tetrad carryover departure not only to the Number 10 increases, but the number 16 increases.

The serial tetrad-adder-subtracter type B (Figure 5) ordered on essential parts from the special tetrad adder-subtractor 8 and the input circuit 9 and del * Control circuit 3 and the carry memory 4 · and the additional Negating circuit 5 and the associated lines. The special tetrad adder-subtracter 8 consists of the main circuit 17 and the correction circuit 19 and the control circuit 3 · The main circuit 17 consists of the Full adders-subtractors 31 to 34. The correction circuit 19 consists of the half-adders 21 and 22 and the remainder circuits 23 and 24. The designations of the inputs and outputs and their valences are the same as with the Type A (Figure 1). The input of the numbers is the same as for type A. The input circuit 9 consists of the Half-subtractors 41 and 42 and the remainder circuits 43 and 44.

As a result of the fact that the addition of the number 10 (HLHL) is practically only a subtraction of the number 6 (LHHL) when the relevant correction tetrad transfer is not processed, the correction circuit 19 is controlled in exactly the same way in type B As with the correction circuit 18 in type A. If the line b is connected to the line £ , a control circuit according to FIG. 6 can be used for both type A and type B.

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Claims (12)

Serial electronic tetrad adder-subtracter in BGD-8421 code, which has a dual tetrad adder-subtractor, which can be switched from addition to subtraction and which can be switched from subtraction to addition and which is in one of its two input areas and in his. Output -he rich each has a correction circuit or recoding circuit, thereby ge. indicates that each of these two correction circuits or encoding circuits (2 and 18) or (9 and 19) is an adding circuit or a subtracting circuit. '· 2) Serial electronic tetrad-add-subtracterx according to claim 1, characterized in that the coding circuit (2) is an adder circuit, which at Control adds the number 6 (LHHL) and that the correction circuit or encoding circuit (18) is a subtracting circuit which, when activated, the number 6 (LHHL) subtracted. (Type A). 3) Serial electronic tetrad-adder-subtracter according to claim 1, characterized in that the encoding circuit (9) is a subtracting circuit, which when controlled, the number 10 (HLHL) subtracted and that the correction circuit or recoding circuit (19) a It is an adder circuit that adds the number 10 when activated and that the related tetrad transfers not processed. (Type B). 4) Serial electronic tetrad-add-subtracter.k according to claim 1, characterized in that a special version this serial tetrad-adder-subtracter has a main circuit (17) and a correction circuit or a coding circuit (18) and a coding circuit (9). (Type G). 5) Serial electronic. Tetrad-Adäier-subtractor according to claim 1, characterized in that another special version of this serial tetrad-adding-subtracting mechanism a main circuit (17) and a correction circuit or a coding circuit (19) and a coding circuit (2). (Type D). . 6) Other electronic tetrad-add-subtract values in the BCD-8421 code, which is a tetrad adder-subtracter have, which can be switched from addition to subtraction and which can be switched from subtraction to addition is, · characterized in that before the tetrad adder-subtracter a correction circuit or recoding circuit is arranged, which an adder circuit or is a subtracting circuit. 7) Other electronic tetrad-add-subtracters in the BGD-8421-Gode, which has a tetrad adder-subtracter have, which can be switched from addition to subtraction and which can be switched from subtraction to addition is, characterized in that before the tet-.raden adder-subtracter a correction circuit or recoding circuit in one of the two input areas is arranged, which an adder or'eine Subtraction circuit is and by adding the number 6 (LHHL) or subtractive addition of the number 6 the relevant Numbers recoded from BGD-O to BGD-6. 8) Other electronic tetrad adders in the BGD-84-21-Gode, characterized in that before the tetrad. Adders in one of the two input areas Adding circuit or subtracting circuit is arranged, which by adding the number 6 (LHHL) or subtractive Adding the number 6 the relevant numbers from BCD-O recoded to BGD-6. ^r COPY . Version 1 9) Other adding units or other subtracting units or ■ other adding-subtracting units in the BGD-84-21-Gode or a similar code, characterized in that they have a special adding circuit for the number 6 (LHHL), which consists of a half adder (4-5) and a full adder (46) and a remainder circuit C47) or from 3 half adders and a remainder circuit (4-7) exists, whereby instead of the remainder circuit (4-7) possibly also a half adder. can be arranged. 10) Other adding units or other subtracting units or other adding-subtracting mechanisms in BGD-84-21 code or a similar Gode, characterized in that they a special subtracting circuit for the number 6 (LHHL), which consists of a half subtracter (35) and a full subtractor (36) and a remainder circuit (37), or 3 half subtractors and one Remainder circuit exists, with a half-subtractor possibly also being arranged instead of the remainder circuit (37) can. 11) Other adding units or other subtracting units or other adding-subtracting units in the BGD-84-21-Gode or a similar code, characterized in that it is a Special adder circuit for the number 10 (HLHL), which consists of 2 half-adders (21 and 22) and 2 remainder circuits (23 and 24-) consists, instead of the remainder circuits (23 and 24 ·) 2 half adders can also be arranged. . - 12) Other adding units or other subtracting units or other adding-subtracting mechanisms in the BGD-84-21-Gode or a similar code, characterized in that they have a special subtraction circuit for the number 10 (HLHL), which consists of 2 half-subtractors (4-1 and 4-2) and 2 remainder circuits (4-3 and 44 ·), where instead of of the remainder circuits (43 and 44), 2 half-subtractors can also be arranged.