JPS599307Y2 - Multi-point data input/output method - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a multi-point, simultaneous input/output method in a data processing system.

In a data processing system, a data processing device is combined with an input/output device, and data is exchanged between the data processing device and its target through the input/output device.

When the input/output device is connected to a data bus, data is exchanged for each word of data by input/output commands from the data processing device.

In other words, in the case of data input, the data processing device
The data input command is executed by specifying the source of the data, and in the case of data output, the destination of the data is specified and the data output command is executed.

Since the source of input data and the destination of output data are expressed by address signals, address signals are also given from the data processor to the input/output device during data input/output.

Generally, from an economical point of view, the data bus is shared for the transmission of address signals and the transmission of input/output data, so that the address signals and data are time-shared on the data bus for each data input or output. Transmitted by .

Conventionally, when inputting or outputting a multi-point signal,
Since the one-by-one output command is used, an address signal is transmitted for each point of multi-point data.

While the operating speed of the input/output device is slow, the operating time for address signal transmission has a small effect on the effective data input/output speed, but as the input/output device becomes faster, the effect becomes larger.

Therefore, when the source or destination of multi-point data is expressed by consecutive addresses, the first address is given to the input/output device only once, and from then on, the addresses are sent to the input/output device using a counter etc. inside the input/output device. However, this method is not general because the arrangement of data sources or destinations in human output devices does not necessarily match the order of access by data processing devices. do not have.

An object of the present invention is to provide a multipoint data input/output method that allows high-speed access even when the arrangement of the source or destination of data in the input/output device does not match the order of access by the data processing device. It is in.

This invention first gives the logical start address to the input/output device only once, then updates the address uniformly using a counter in the input/output device, and converts this value one by one to determine the effective address. This is how it was done.

The present invention will be explained below with reference to the drawings.

FIG. 1 is a conceptual diagram of an embodiment of the present invention.

In FIG. 1, 1 is a data processor, 2 is a data bus, and 3 is an input/output device.

The data processing device 1 and the input/output device 3 are connected by a data bus 2.

It is now assumed that the input/output device 3 is a multi-point analog data input device.

In the input/output device 3, a selector 31 selects a specified one from among the applied multi-point analog input signals, converts it into a digital signal, and sends it to the register 3.
There is something to be given to 2.

The contents of register 32 are provided to data bus 2.

This data is read by the data processor 1.

The number of the input signal to be selected by the selector 31 is specified by the input number converter 33.

The input number converter 33 converts the count value of the input number counter 34 to determine a physical input number.

The physical input number is an actual number assigned to each multi-point analog input signal, and corresponds to an effective address.

This physical input number is assigned in the order of the physical arrangement of input channels in the input/output device 3.

The data on the data bus 2 is set in the manual number counter 34 as an initial value.

The count value of this counter is updated by ■ each time the overnight processing device 1 reads one piece of multipoint analog data.

This count value gives the logical input number. The logical input number is a number conveniently assigned to each multi-point analog signal by the data processing device 1, and is a logical address assigned according to the order of data reading.

The order of data reading is determined depending on the purpose of data processing.

Therefore, reading of multi-point analog data by the data processing device N1 is not necessarily performed in the order of the physical arrangement of the input channels, and the logical input number and the physical input number are generally not the same.

The sequence controller 35 includes a selector 31 and a register 32.
, controls the operation of the input number counter 34.

The sequence control device 35 operates according to manual commands given from the data processing device 1 through the control line of the data bus 2.

FIG. 2 shows an example of the correspondence between logical input numbers and physical input numbers.

The physical input numbers are assigned in the order of the physical arrangement of the input channels in the selector 31.

The input channels are arranged, for example, so that input signals having the same range form the same blocks A, B, and C, respectively.

On the other hand, the overnight processing device 1 uniquely groups input signals (○△×) according to the purpose of overnight processing.
Logical numbers are assigned according to the order of reading.

Each group of cells can have a different reading cycle.

The input number converter 33 for converting logical input numbers into physical input numbers is constituted by, for example, a read-only memory ROM or a random access memory RAM;
The physical input number is stored at the address corresponding to the logical input number.

A manual number counter 34 is added to such an input number converter 33.
When the count value of is given as an address, the physical input number is read from that address.

The correspondence between logical input numbers and physical input numbers is known in advance, and ROM cutting or RAM writing is performed based on this.

Writing to the RAM can be performed by the data processing device 1 via the transfer bus 2.

The operation of the device configured in this way is as follows.

The data processor 1 places the logical input number of the first data of the data group to be read on the data line of the data bus 2, and places an input command on the control line of the data bus 2.

Then, the logical input number on the data line is set in the input number counter 34 by the operation of the sequence controller 35 in accordance with the input command.

This logical input number is converted into a physical input number by the input number converter 33 and is provided to the selector 31.

The selector 31 selects the human input signal corresponding to the given physical input number, converts it into digital data, and supplies it to the register 32.

This data is set in register 32 by sequence controller 35.

The data in register 32 is placed on the data line of data bus 2.

At this time, the sequence controller 35 puts an instant ready signal on the control line of the data bus 2.

The data processing device 1 reads data on the data line according to this signal.

Next, the data processing device 1 issues an input command without specifying a logical input number.

In response to this input command, the sequence control device 35 updates the count value of the input number counter 34 by one.

This designates the next logical input number, which is converted into a physical input number by the input number converter 33 and given to the selector 31, so that the analog input number of that physical input number is selected by the selector 31. be done.

Thereafter, a series of analog data is input to the data processing device 1 through similar operations.

When the data processing device 1 receives all the scheduled analog data, it stops sending out manual commands.

As a result, the sequence controller 35 stops incrementing the input number counter 34 and stops the operation of the input/output device 3.

In this way, the data processing device 1 can read input data of discrete physical input numbers without specifying the input numbers one by one.

If the overnight processing device 1 were to be able to specify the number of input data when sending the first input command, and the sequence controller 35 would be able to stop after operating for the number of data, the input command would also be You only need to give it once at first.

When the human output device 3 is a multipoint analog output device, the same operation as described above is performed except that the data flow is reversed, and the same effect is produced.

Note that human output output is not limited to analog output.

The above is a case in which signal selection, conversion, and input/output operations are performed serially for each piece of data during one-time input/output.
The present invention is effective when selection and conversion operations in an input/output device are performed at high speed.

If the selection and conversion operations in the input/output device are slow, a buffer memory is provided within the input/output device, and the input/output device uniformly performs the data selection and conversion operations between the buffer memory and the data processing target. The data processing device is
There are times when you want to perform continuous input/output to memory.

In this way, the speed of data transfer between the data processing device and the input/output device is increased, so if the present invention is applied to the reading and writing of buffer memory by the data processing device, it will be effective to further increase the speed. be.

As described above, in the present invention, when inputting and outputting data from multiple points, the logical start address is given to the input/output device only once at the beginning, and thereafter, the counter in the input/output device autonomously The logical address is updated and the effective address is determined by converting this value one by one.

Therefore, a multi-point data input/output method is obtained that allows high-speed access even when the arrangement of data sources or destinations in the human output device does not match the order of access by the data processing device.

[Brief explanation of drawings]

FIG. 1 is a mechanical structural diagram of an embodiment of the present invention, and FIG. 2 is an illustration of a part of the apparatus shown in FIG. 1. 1... Data processing device, 2... Data bus, 3.
... Input/output device, 31... Selector, 32... Register, 33... Input number converter, 34... Input number counter, 35... Sequence controller.

Claims (1)

[Scope of utility model registration request] A power counter to which a logical address given by a data processing device representing the source or destination of data is set; Te' overnight output is 1
a sequence controller that updates the logical address of the counter by 1 each time the counter is completed; a converter that is given the logical address of the counter and converts the logical address into a physical address; A multi-point data input/output method that is provided with an address and has a selector that selects the data source or data destination corresponding to this physical address.