JPS6160465B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention is based on a board that constitutes a computer, and includes a central processing unit board (hereinafter referred to as a CPU board) having common functional blocks such as a parity check circuit and a parity generate circuit;
In a computer system in which, in addition to input/output boards (hereinafter referred to as I/O boards) and memory boards, different types of I/O boards or memory boards that do not have the above common function blocks are mixed, system-specific This relates to a different type discrimination method to prevent loss of functionality.

FIG. 1 shows the configuration of a conventional computer system of this type developed on a printed circuit board. In other words, in the same figure, 1 is the CPU board,
2 and 2 are I/O boards, 3 is a different type of I/O board that is the same type as the I/O boards 2 and 2, and 4 is a system bus that connects each board.
Boards 2 and 2 have a common function block 5 such as a parity check circuit and a parity generate circuit, and a different type of I/O board 3 that does not have this
A computer system is composed of a mixture of

In the configuration shown in FIG. 1 above, the common function block 5
is effective when transferring data between CPU board 1 and I/O board 2, which are connected by system bus 4.
When data is transferred, since there is a common function block 5 in I/O board 2, CPU board 1
and the common function block 5 built into the I/O board 2, respectively, work effectively to perform highly reliable transfer. That is, when the CPU board 1 continues to receive data from the I/O board 2, the common function block 5 in the CPU board 1 is configured to add a parity signal to the data address.
A common function block 5 built into the I/O board 2 checks this, and based on this, sends the data at the address back to the CPU board 1.

However, in the computer system with the above configuration, when the CPU board 1 transfers data with the different type of I/O board 3, the common function block 5 is not included inside the different type of I/O board 3.
Since the function of common function block 5 of CPU board 1 cannot be used and access from CPU board 1 to I/O boards 2 and 3 is arbitrary, as a result, common function block 5, which occupies the majority of the system, cannot be used. When accessing a board including the common function block 5, data must be transferred without using the functions of the common function block 5, and data transfer is performed without using the functions originally provided. Therefore, in such a case, if even one different type of board is mixed, the system becomes extremely unreasonable. Therefore, the present invention has been made to solve the above-mentioned problems of the conventional ones.When a CPU board accesses an I/O board or a memory board, the board has a common function block. To provide a method for discriminating different types of boards, which enables data transfer using the common function block and makes full use of the original functions. The purpose is

Hereinafter, one embodiment of the present invention will be explained with reference to FIG. 2, in which the same parts as in FIG. 1 are denoted by the same reference numerals. In FIG. A similar common function block 5 is built in, and a function valid signal output block 6 is also built in to send out a signal indicating that the common function block 5 is valid when transferring data with the illustrated CPU board 10.

On the other hand, the CPU board 10 has a built-in common function block 5 as in the conventional case, and the function enable signal sent from the function enable signal output block 6 is inputted via the enable signal line 7. A determination circuit 8 is built in to determine whether data transfer is possible using the common function block 5.

Therefore, in the configuration shown in Figure 2, CPU board 1
0 can use the common function block 5 when transferring data with the I/O boards 20, 20.
In other words, the common function block 5 is built into the I/O boards 20, 20, and the valid signal of the common function block 5 is output from the function valid signal output block 6, so the CPU board 10 has a built-in discrimination circuit. 8, it can be determined that it is valid,
Based on this determination, data can be read from the I/O boards 20, 20. Note that this is meaningless for data writing.

On the other hand, the CPU board 10 is the common function block 5.
When accessing a foreign I/O board 3 that does not have a function valid signal output block 6, the valid signal line 7 does not become significant. Therefore, the determination circuit 8 in the CPU board 10 determines that the common function block 5 is not used in this access, and ends the access.

Therefore, the majority of I/Os with common functional blocks
This function is utilized when accessing boards 20 and 20, and is not used only when accessing board 3 of a different type, so even if different types of boards coexist, the original function of the system is impaired. It can be used without any problems.

In the above embodiment, access with the CPU board 10 was explained only in the case of the I/O board 20, but the same applies to a memory board that incorporates the common function block 5 and the function enable signal output block 6. Of course, it is effective.

As described above, according to the present invention, since boards having common functional blocks such as a parity check circuit and a parity generate circuit and different types of boards are monitored by the discrimination line, different types of boards are mixed. This also has the effect that data transfer can be performed without impairing the original function.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing a conventional computer system configuration, and FIG. 2 is a block diagram showing a system configuration according to an embodiment of the present invention. 1, 10...CPU board, 2,20...I/O board, 3...Different I/O board, 4...System bus, 5
...Common function block, 6. Function valid signal output block, 7. Valid signal line, 8. Discrimination circuit. In addition, in the figures, the same reference numerals indicate the same or corresponding parts.

Claims (1)

[Claims] 1 A board base constituting a computer, comprising a central processing unit board having common function blocks such as a parity check circuit and a parity generate circuit, and an input/output board and a memory board also having the common function blocks, and In a computer system consisting of a mixture of different types of input/output boards or memory boards that have the same board size as the input/output board and memory board but do not have the above common function block, each of the input/output board and memory board that has the above common function block has A function valid signal output block is provided, and the valid signal sent by the function valid signal output block is input to the central processing unit board via the valid signal line, and data is transferred using the common function block. What is claimed is: 1. A method for discriminating different types of boards in a computer system, comprising a built-in discriminating circuit for discriminating whether or not a common function block is possible.