JPS61286952A - Multiple i/o control device - Google Patents

Abstract

PURPOSE:To transfer data from an I/O in an I/O control device directly to another I/O in the same I/O control device without passing the data through a processor by forming plural I/O registers, a data switching register and a data priority circuit to control plural I/Os. CONSTITUTION:A parallel/serial conversion register 6 and a serial/parallel conversion register 7 for two I/O devices, the data switching register 8 and the data priority circuit 9 are formed. Consequently, pen position coordinate data inputted from a tablet 4 can be simultaneously processed in a multiple I/O control device 5 and sent to a graphic display 3 without passing the data through the processor 1, so that the processing capacity of the processor 1 can be improved. In addition, high responsibility of operation is obtained by transferring the pen position coordinate data to the display 3 within a short time.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Application of the Invention] The present invention relates to control of Ilo, and in particular, to controlling a plurality of Ilo and transferring data between I/O without using a processing device. The present invention relates to a multi-I/O control device suitable for transferring data to each I/O within an O control device.

[Background of the invention]

In conventional I/O control devices, data transfer between each I/O is always performed via a processing device, even when controlling each I/O or a plurality of Ilo's.

Therefore, data cannot be exchanged for a short period of time between I/Os, and the processing device takes processing time to transfer Ilo data, which hinders efficient data processing of the entire system.

Note that, as an example of data transfer between I/O,
Publication No. 823 is mentioned.

(Object of the Invention) An object of the present invention is to provide a device that controls a plurality of Ilo's and transfers data from the Ilo to other Ilo's within an I/O control device without going through a processing device. There are some things.

[Summary of the invention]

The key point of the present invention is to utilize the fact that the data formats between I/Os are similar to transfer data between each I/O via an I/O control device without going through a processing device. It is in.

[Embodiments of the invention]

An embodiment of the present invention will be described below with reference to FIGS. 1, 2, 3, and 41! This will be explained by I.

This embodiment includes a processing device 1, a memory 2, a graph ink display 3, a tablet 4, a display data register/O, and a tablet data register 11.
, a data switching register 8, a data priority circuit 9, a counter 14, a parallel/serial conversion register 6,
Multi-I consisting of serial/parallel conversion register 7
/O control device 5. The pen position coordinate data from the tablet 4 is displayed on the processing device 1 and the graphic display 3 via the multi-I/O control device 5, or
The data is passed from the processing device 1 to the graphic display 3 via the multi-I/O control device 5.

The operation of the embodiment will be described in detail below.

The coordinate data of the pen operated by the operator (-block data 32 is composed of one byte of control data 34 and four bytes of coordinate data 36 in FIG. 3(a)) is synchronized with the tablet clock 24 from the tablet 4 and serially transmitted. /It is set in the tablet data register 11 via the parallel conversion register 7. The interrupt circuit 16 is activated by the output signal of the start bit detection circuit 17 that determines data reception, and an interrupt is output to the processing device 1. Based on the interrupt signal 21, the processing device 1 reads data from the tablet data register 11 every time an interrupt is accepted.Meanwhile, data from the same tablet 4 is also sent to the data switching register 8 and the data priority circuit 9. . The data priority circuit 9 first receives the control data 34 from the tablet 4 (゛・26="O", 25="0", 24="
1") is data, the decoder 29 rechecks it and determines that it is the data from the tablet 4, passes the data from the tablet 4 to the parallel/serial conversion register 6, synchronizes it with the display clock 22, and displays the graphic display 3. The data priority circuit 9 further sets the tablet busy bit 39 of the status register 12 to II 1 #j, notifies the processing device 1 that data is being sent from the tablet 4, and also sends data to the data block 32 (
5 bytes) The data from the tablet 4 is passed through the output data of the data switching register 8 until the transmission is completed. After the completion of sending 5 bytes, the data priority circuit 9 is initialized by the output signal of the counter 14, and the tablet busy bit 39 of the status register 12 is set to IIO##. Further, the output signal of the counter 14 sets the transfer completion bit 41 of the status register 12 to at 1 n.

This operation is repeated every time the operator operates the pen, and data from the tablet 4 is sent to the processing device 1 and the graphic display 3 at the same time.

Next, when sending data from the processing device 1 to the graphic display 3 via the multi I/O control device 5, the processing device 1 takes in the contents of the status register 12 in the multi I/O control device 5, Confirm that the tablet busy bit 39 is 1/O #, and write the display control data 35 (data block 33 is the control data 3) in the display data register 1o.
It consists of one byte of data 5 and four bytes of graphic data 37. )
Set. The data priority circuit 9 outputs display control data 35 (26="0", 25=""O) from the output data of the display data register/O.
”, 24 = “O”), the data decoder 2
9, pass the data of the display data register /O to the output of the data switching register 8, and connect the parallel /
Via serial conversion register 6.

The data is synchronized with the display clock 22 and sent to the graphical display 3. The data priority circuit 9 is
Status register 12 display busy bit 4
0 to 1'', and the data in the display data register /O is passed through the data switching register 8 until the transfer of 5 bytes of data is completed.

Send to parallel/serial conversion register 6. Also, each time data is set in the display data register /O, the data is transferred from the parallel/serial conversion register 6.
The interrupt circuit 16 is activated by the output signal of the delay circuit 15, which takes into account the time required for the transmission path, and the processing unit 1 is notified of the completion of data transmission by the interrupt signal 21.

The above operations are repeated to send data from the processing device 1 to the graphic display 3.

According to this embodiment, a parallel/serial conversion register 6, a serial/parallel conversion register 7, a data switching register 8, and a data priority circuit 9 are provided for two I'/O devices.
By providing this, pen position coordinate data from the tablet 4 can be transferred to the multi-I/I/
Data can be sent to the graphic display 3 at the same time within the control device 5, and the data transfer processing from the processing device 1 to the graphic display 3 is increased, thereby increasing the processing capacity of the processing device 1. In addition, by passing the pen position coordinate data to the graphic display 3 in a short time, it is effective to increase the responsiveness of the operation. In addition, 1
3 is an address decoder, 18 is a data signal, 19 is an address signal, 20 is a read/write signal, 22 is a display lock, 23 is display transmission data, 24 is a tablet clock, 25 is tablet reception data, 26
27 is a priority circuit output signal, 27 is display parallel data, 28 is tablet parallel data, 30 is a counter output signal, 31 is a D latch flip-flop, and 38 is status data.

〔Effect of the invention〕

According to the present invention, it is possible to transfer data between each I/O within the control device without using a processing device.

[Brief explanation of drawings]

FIG. 1 is a system configuration diagram of an embodiment of the present invention, FIG. 2 is a configuration diagram of a data priority circuit, FIG. 3 is a configuration diagram of data blocks of a tablet and a graphic display, and FIG.
The figure shows the contents of the status register.

Claims (1)

[Claims] 1. An I/O control device comprising an input/output shift register, a data register, an address duder, and an interrupt circuit, comprising a plurality of input/output shift registers, a data switching register, and a data priority circuit. A multi-I/O control device characterized by: