JPH0337223B2 - - Google Patents

Description

Detailed Description of the Invention (Technical Field) The present invention has a basic configuration of a control board and an input/output board controlled by the control board, and connects the boards to each other by connecting the board-to-board connection pins to each other. This invention relates to a bus expansion structure in a system, such as a processor system, connected via a backboard formed by bus wiring.

(Prior art) Conventionally, this type of system, that is, a control board and one or more input/output boards controlled by the control board, are mounted on a backboard with bus wiring of the same specifications and interconnected. In a created system, such as a processor system, the bus wiring on the backboard is formed in advance so that it can accommodate the maximum number of input/output boards that can be controlled by the control board, and then the bus wiring on the back board is configured to accommodate the maximum number of input/output boards that can be controlled by the control board. The method used is to add and implement sequentially. Another possible mounting method is to form the bus wiring on the backboard so that the basic configuration of a pair of control board and input/output board can be accommodated as a unit.

However, in such a configuration, if there is a function addition to the system that exceeds the upper limit of functions that can be accommodated on one input/output board, a new input/output board is added and the existing one is replaced. It is necessary to physically connect to the control board, for example, by using a bus expansion connector, to expand the system, and in the latter case, a new pair of An input/output board and a control board will be used. In this way, conventional bus expansion requires parts such as connectors,
Alternatively, a new control board is required, which poses problems in terms of reliability of connection between the expanded boards, as well as economic efficiency, mounting aspects, and the like. A conventional example in which a system is configured by mounting a control board and a plurality of input/output boards controlled by the control board on a backboard will be described below.

Figure 1 shows an example of the configuration of a processor system. In the figure, CPU is a central processing unit that manages various controls within the system, and 1-1 to 1-3 are equipped with electronic components (not shown). control board,
2-1a to 2-1c, 2-2a to 2-2c, 2-
Reference numeral 3a denotes an input/output board each mounted with an electronic component (not shown) and controlled by the control boards 1-1 to 1-3. Note that the input/output board is 2
-Group 1 consisting of 1a to 2-1c and 2-2
Each group consists of a group consisting of a to 2-2c and a group consisting of 2-3a,
, are electrically insulated, and the boards in each group have the same functions: control board 1-1, input/output board 2-1a, control board 1-2, input/output board 2-2a, and control board. 1-3 and the input/output board 2-3a form a basic configuration in pairs, and the other input/output boards 2-1b, 2
-1c, 2-2b, and 2-2c are expansion boards each having additional functions. Furthermore, _B1 is an internal bus for transmitting signals between the central processing unit and the control board, _B2 is an input/output bus for transmitting signals between the control board and the input/output board, and _B3 is the basic configuration. This figure shows a connection part using, for example, a connector for bus expansion, which physically connects the control board that forms the main unit and an additional input/output board.

FIG. 2 is a diagram showing the system shown in FIG. 1 specifically implemented and configured using a backboard, and is a perspective view showing an example of the configuration of the backboard and each board. In the figure, 1-1 to 1-3 and 2-1a
2-1c, 2-2a, 2-2c, and 2-3a are control boards and input/output boards similar to those shown in FIG. 1, respectively. Further, numeral 3 indicates a backboard on which a pattern (not shown) for connection between boards is formed, and numeral 4 indicates a connector for a printed circuit board fixed on the backboard 3. Note that the central processing unit CPU shown in FIG. 1 is not illustrated here.

FIG. 3 shows an example of a pattern formed on the backboard 3 shown in FIG. In the figure, B ₁ and B ₂ indicate an internal bus and an input/output bus, respectively, as in FIG. 1. The slots A to K correspond to the board insertion openings of the printed circuit board connector (see Figure 2) fixed to the surface of the backboard 3, and the board insertion openings corresponding to slots A, E, and J each have a control slot. Substrate 1-1, 1-
2, 1-3 are input/output boards 2-1a, 2-2a, 3 in the board insertion slots corresponding to slots B, F, K.
-3a, and input/output boards 2-1 as needed in the board insertion slots corresponding to slots C, D, G, and H.
b, 2-1c, 2-2b, and 2-2c are each mounted as shown in FIG. Also, inter-board connection pins 1a to 5a, 1 are provided corresponding to each of the slots A to K.
b ~ 5b, ~, 1j ~ 5j, 1k ~ 5k are arranged, among which 1a ~ 5a and 1b ~ 5b, 1c ~
5c and 1d-5d, 1e-5e and 1f-5f, 1
g~5g and 1h~5h, 1j~5j and 1k~5k
are mutually bus-wired to form an input/output bus _B2 .

As described above, in the configurations shown in FIGS. 2 and 3, if there is a request to add functions to the control board 1-1 and the input/output board 2-1a, which constitute the mounted board configuration, the addition of functions will be met. I will be adding additional input/output boards 2-1b and 2-1c,
In this case, the inter-board connection pins 1b to 5b correspond to slot B where the input/output board 2-1b is mounted, and the slot C where the additional input/output board 2-1c is mounted.
It is necessary to electrically connect the inter-board connection pins 1c to 5c.

For this reason, FIG. 4 shows an example in which an expansion connector 5 is fixed to a board connection pin on the backboard 3 as the electrical connection means. That is, in FIG. 3, the board connection pins 1b to 5b of slot B and the corresponding pins 1c to 5c of slot C are connected by the connector 5 (corresponding to B3 in FIG. 1) to expand the bus. It was on. Similarly, input/output boards 2-2b, 2- are added by adding functions to the basic configuration of the paired control board 1-2 and input/output board 2-2a.
2c is also added by attaching an expansion connector to the board connection pin on the backboard. That is, the bus was expanded by connecting slots 1f to 5f of slot F and the corresponding slot G using expansion connectors.

However, in the conventional bus expansion structure as mentioned above, as mentioned above, there were problems in terms of connection reliability, economy, implementation, etc., as described above.

(Object of the Invention) The present invention has been made in consideration of these problems, and it is possible to easily expand the system and improve reliability without using any parts for connection. The purpose of the present invention is to provide a bus expansion structure that can be used in various ways.

(Structure of the Invention) That is, the present invention provides a connection pattern for the connection pin on the backboard for connection between boards and the corresponding connection pin of the input/output board. This eliminates the need for parts and achieves the above objective. Hereinafter, the present invention will be explained using the drawings.

(Embodiment of the invention) FIG. 5 is a diagram showing an embodiment of the bus expansion structure according to the present invention. In the figure, 13 is a backboard, which is different from the conventional case shown in FIGS. 2 and 3. Similarly, a pattern surface formed on a backboard is shown. Also, B ₁ and B ₂ are _the same internal buses and input/output buses as shown in FIG.
This is the expansion bus pattern added on 3. Further, 2-1a' and 2-2a' are input/output boards having connection patterns _B3 -A and _B3 -B for bus expansion, and the input/output board 2-1a' is connected to slot B on the back board 13. The input/output boards 2-2a' are mounted on connectors (not shown) fixed corresponding to the slots F to H on the back board 13, respectively. Furthermore, control boards (not shown) are mounted on connectors fixed to slots A, E, and J on the backboard 13, respectively, as in the conventional explanation.

Here, the backboard 13 and the input/output board 2
Let's take a look at the patterns -1a' and 2-2a'.
First, regarding the input/output bus _B2 on the backboard 13, as shown in the figure, the interboard connection pins 1a and 1
b, 2a and 2b, 3a and 3b, 4a and 4b, 5a
and 5b, 1c and 1d, ..., 5c and 5d, ~, 1j
A pattern connecting 1k, 2j and 2k, . . . , 5j and 5k is formed. Also, regarding the expansion bus _B3 ', the inter-board connection pins 6b and 6c, 7b and 7
c, 8b and 8c, 9b and 9c, 10b and 10c,
6d and 6e, ..., 10d and 10c, ~, 6h and 6
A pattern is formed that connects j, 7k and 7j, . . . , 10h and 10j. Furthermore, input/output board 2
-1a' and 2-2a' have terminals _P1 to P5 and _{Q1 to Q5 ,} which correspond to input/output bus _B2 and connect to control signal lines (not shown) of the control board, respectively, as shown in the figure. , the preselected number of connection patterns B ₃ -A-, B ₃ -B- that connect the corresponding terminals P ₆ to _{P 10} and Q ₆ to _{Q 10} of the expansion bus B ₃ ' are different patterns. It is being formed.

Here, in the backboard 13 having the above pattern, the first
Mount the control board for slot A,
An input/output board 2-1a' forming the basic structure is mounted in slot B, and input/output boards 2-1a' corresponding to the additional functions are mounted in slots C and D. By mounting these boards, the control board connects the terminal _P1 of the input/output board _2-1a ' mounted corresponding to slot B via the board-to-board connection pins 1a and 1b by each bus pattern of the input/output bus B2. At the same time, it is connected to the terminal _P8 via the connection pattern _B3 - _A1 on the input/output board 2-1a'. As a result, the control board and the input/output board mounted in slots A and B on the backboard 13 can be connected to the board-to-board connection pin 1a via the input/output bus _B2 and the expansion pattern _B3 - _A1 .
This means that they are connected by the route b- _P1- ( _B3 - _A1 ) _-P8-8b -8c. Similarly, the inter-board connection pin 2a is 2b- _P2- ( _B3 - _A2 ) _-P7-7b -7
c route, and the board-to-board connection pin 3a is 3b.
-P ₃ (B ₃ -A ₃ ) -P ₆ -6b-6c are connected respectively, so the first control board corresponding to slot A and the input/output board 2-1a' corresponding to slot B are electrically connected. Thereafter, when the input/output boards 2-1a' corresponding to slots C and D are mounted due to the addition of functions, the back board 1 is mounted as in the case of mounting to slot B.
They are connected to the control board corresponding to slot A via the input/output bus _B2 on the input/output board 3 and the expansion pattern _B3 -A on the input/output board 2-1a'. That is, the inter-board connection pin 1a corresponding to slot A is connected to the control signal line of the first control board.
~3a are inter-board connection pins 1b~3b, 1c~3c, 1d~3 corresponding to slots B, C, and D, respectively.
d and realizes bus expansion. In this way, bus expansion between a control board and a plurality of input/output boards of a group controlled by the control board can be easily realized without using connection means using separate parts such as connectors.

The input/output board 2-2a' constitutes an electrically insulated group from the second control board mounted corresponding to slot E and the group mounted corresponding to slots F to H controlled by the control board. It is clear that the connection with, in other words, the bus expansion, can be carried out in the same way as the example of the bus expansion of the board mounted corresponding to the slots A to D described above. That is, the control board corresponding to slot E and each input/output board 2-2a' corresponding to slots F to H correspond to the patterns of the input/output bus _B2 and expansion bus _B3 ' on the back board 13, and the respective input/output boards 2-2a'. By connecting terminals Q ₄ and Q ₁₀ and Q ₅ and Q ₉ on terminals Q ₄ and Q ₁₀ and Q ₅ and Q ₉ on Connection pins 4e to 5e are interboard connection pins 4f to 5f, 4g to 5g, and 4h corresponding to slots F to H, respectively.
~5h, and bus expansion can be realized.

(Effects of the Invention) As described above, according to the present invention, the inter-board connection pins on the backboard are used to connect them to each other to form an internal bus for signal exchange between the central processing unit and the control board, and a control board. Forms each bus pattern of an input/output bus for signal transfer between the board and the input/output board, and an expansion bus for bus expansion, and in the case of input/output boards, a bus pattern between the boards that forms the input/output bus and the expansion bus. The required number of expansion patterns are formed to connect between the connection pins.This allows for easy system expansion, in other words, bus expansion.Moreover, since the configuration does not require connection using separate parts such as connectors, reliability is improved. Therefore, it is possible to provide a bus expansion structure which has excellent advantages in terms of economy, implementation, etc.

[Brief explanation of the drawing]

Fig. 1 is a diagram showing an example of the configuration of a system to which the present invention is applied, Figs. 2 to 4 are block diagrams in which the system shown in Fig. 1 is specifically implemented using a backboard, and Fig. 5 is FIG. 3 is a diagram illustrating an example of a bus expansion method according to the present invention. CPU is a central processing unit, 1-1 to 1-3 are control boards, 2-1a to 2-1c, 2-2a to
2-2c, 2-3a, 2-1a', 2-2a' are input/output boards, 3 and 13 are back boards, 4 is a connector for printed circuit boards, 5 is an expansion connector, B ₁
is an internal bus, _B2 is an input/output bus, B-3 is an expansion bus, and B3 _- A and _B3 -B are expansion patterns.

Claims (1)

[Claims] 1. A backboard is used to connect the boards to each other by interconnecting the board-to-board connection pins to form an internal bus and an input/output bus, and a control board and a device controlled by the control board are installed on the backboard. In a system configuration in which a plurality of input/output boards are mounted as a basic configuration, and these are mounted insulated from each other, in the case of a back board, the connection pins between boards in adjacent slots are connected to each other. An expansion bus is formed, and in the case of the input/output board, an expansion pattern is formed to connect terminals corresponding to the control signal lines of the control board and terminals corresponding to the expansion bus wiring formed on the backboard. , an input/output board inserted into a corresponding slot on the backboard in response to addition of system functions is electrically connected to the control signal line of the control board via the expansion bus and the expansion pattern. Features a bus expansion structure.