JPH0378065A - Reception control system for peripheral device - Google Patents

Abstract

PURPOSE:To prevent data missing from being generated on a CPU side by sending a reception request to the peripheral device by using a receiving buffer in a peripheral controller when the peripheral controller is initialized and when data is received from the peripheral device. CONSTITUTION:When the CPU 10 sends a request for initialization, the initializing means 202 of the peripheral controller 20 operates and a receiving means 203 sends the reception request to the peripheral device 30 subsequently by using the receiving buffer 201. Further, when data is received from the device 30, the controller 20 holds the receiving buffer 201 by a received data holding means 204, holds the reception request 205 from the CPU 10 by a reception request holding means 206, and actuates a received data assigning means 207, and a transfer means 208 transfers the contents of the receiving buffer 201 to a main storage 40. Even if the load on the CPU 10 increases in the constitution, the reception request is sent to the controller 20, so the received data from the device 30 can be received by the controller 20 definitely and the data missing on the side of the CPU 10 is prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a reception control system for a peripheral device in which a central processing unit controls the peripheral device via a peripheral control device, and in particular to a reception control system for a peripheral device in which a central processing unit controls the peripheral device via a peripheral control device. Regarding efficiency.

BACKGROUND OF THE INVENTION Conventionally, in the reception control method of this type of peripheral device, the reception request issued by the central processing unit to the peripheral control device and the reception request issued by the peripheral control device to the peripheral device are linked. Unless the central processing unit issues a reception request to the peripheral control device, the peripheral control device does not issue a reception request to the peripheral device.

Problems to be Solved by the Invention In the conventional peripheral device reception control method described above, unless the central processing unit issues a reception request to the peripheral control device, the peripheral control device does not issue a reception request to the peripheral device. If the load on the central processing unit increases, it will take time to issue a reception request to the peripheral control device, and the peripheral control device will issue the request to the peripheral device in conjunction with the central processing unit's reception request. The disadvantage is that the received data from the peripheral device cannot be received by the peripheral control device because there is no receive request from the peripheral control device, and as a result, data dropout occurs on the central processing unit side. be. Furthermore, a similar result occurs when a large amount of received data is generated on the peripheral device side.

The present invention has been made in view of the above-mentioned conventional situation,
SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a new peripheral device reception control method that makes it possible to eliminate the above-mentioned drawbacks inherent in the conventional technology.

Means for Solving the Problems In order to achieve the above object, the reception control method for a peripheral device according to the present invention includes an initial setting request 9 that requests the peripheral control device to initialize the peripheral control device from the central processing unit. means, an initial setting means for initializing the inside of the peripheral control device in response to an initial setting request from the central processing unit, and a receiving buffer in the peripheral control device at the time of initial setting and when receiving data from the peripheral device. receiving means for issuing a reception request to a peripheral device; received data holding means for holding received data from the peripheral device received by the receiving means; and receiving means for requesting reception from the central processing unit to the peripheral control device. a request means, a reception request holding means for holding a reception request issued from a central processing unit, and a reception request holding means that is activated by the reception data holding means and the reception request holding means and is held by the reception request holding means; Received data allocation means that allocates the received data held by the data holding means; Transfer means that transfers the received data notified by the received data allocation means to the main memory; and After the received data is transferred by the transfer means, a receive buffer return unit that transfers received data and returns a receive buffer that is no longer needed; and a receive buffer return unit that centrally processes a receive request from a central processing unit to which received data is allocated by the receive data allocation unit after issuing the receive buffer return unit. The apparatus is configured to include a reception completion notifying means for notifying the device of completion.

Embodiment Next, a preferred embodiment of the present invention will be described with reference to the drawings.
A detailed explanation will be given below.

FIG. 1 is a block diagram showing the entirety of an embodiment of the present invention. Fig. 2 is a processing block diagram when an initial setting request means is issued from the central processing unit, Fig. 3 is a processing block diagram when a reception request means is issued from the central processing unit, and Fig. 4 is a processing block diagram when a reception request means is issued from the central processing unit. FIG. 3 is a processing configuration diagram when receiving data is received.

Referring to FIG. 1, one embodiment of the present invention includes a central processing unit 10, an initial setting requesting means 101 for requesting the peripheral control device 20 from the central processing unit 10 to initialize the peripheral control device 20, and a central processing Reception request means 102 requests reception from the peripheral control device 20 from the device 10, peripheral control device 20, reception buffer 201, initial setting to initialize the inside of the peripheral control device 2 in response to an initial setting request from the central processing unit IO. means 202, receiving means 203 for issuing a reception request to the peripheral device 230 using the reception buffer 201 in the peripheral control device 20 at the time of initialization and when receiving data from the peripheral device 30; Reception data holding means 204 that holds the received data from the peripheral device 3°, reception request 205 issued from the central processing bag 210, and reception request holding means 206 that holds the reception request 205 issued from the central processing unit 10. , a received data allocating means 207 that allocates the received data held by the received data holding means 204 to the received request 205 activated by the received data holding means 204 and the received request holding means 206 and held by the received request holding means 206; A transfer unit 208 that transfers the received data notified by the data allocation unit 207 onto the main storage device f40, and a receive buffer return unit that transfers the received data and returns the unnecessary receive buffer after the transfer is completed by the transfer hand jf208. means 209, reception completion notification means 210 for notifying the central processing unit 10 of completion of a reception request from the central processing unit 10 to which received data has been allocated by the reception data allocation means 207 after the reception buffer return means 209 is issued; It is composed of a storage device 40.

Next, the operation of the present invention will be explained with reference to FIGS. 1 to 4.

First, when the central processing unit 10 requests the peripheral control device 20 to initialize the peripheral control device 20 using the initial setting requesting means lO1, the initial setting means 202 operates in the peripheral control device 20, and the peripheral control device 20, and by extension, receive buffer 2 in peripheral control device 20.
01 to issue a reception request to the peripheral device 30, thereby causing the peripheral device 3
It becomes possible to receive data from 0.

Further, the peripheral control device 20 receives the reception means 2 from the peripheral device 30.
When data is received in the reception buffer 201 at 03,
The peripheral control device 20 temporarily holds the reception buffer 201 in the peripheral control device 20 by the reception data holding means 204, and activates the reception data allocation means 207.

Further, when the central processing unit lO requests the peripheral control device 20 to receive data using the reception request means 102, the peripheral control device f20 receives the reception request 20 from the central processing device 10.
5 is received by the peripheral control device 20 by the receiving request holding means 206.
The received data allocation means 207 is activated.

Here, the received data allocation means 207, which is activated when the peripheral control device 20 receives data from the peripheral device 30 and when the peripheral control device 20 receives the reception request 205 from the central processing unit 10, receives data from the central processing unit f10. It is checked whether both the reception request 205 and the reception buffer 201 that received data from the peripheral bag W30 are held in the peripheral control unit 20, and if both are held, the reception request 205 from the central processing unit 1θ is checked. The receiving buffer 201 that receives data from the peripheral device 30 is allocated to the transfer means 208, and the transfer means 208 is activated.

The transfer means 208 activated by the reception data allocation means 207 transfers the contents of the reception buffer 201 onto the main storage device 40, and activates the reception buffer return means 209. The reception buffer return means 209 activated by the transfer means 208 transfers the received data and returns the unnecessary reception buffer so that it can be used by the next reception means 203, and activates the reception completion notification means 210. Reception completion notification means 2 activated by reception buffer return means 209
10, the reception buffer 201 is connected to the reception data allocation means 2;
The reception request 205 from the central processing unit 10 assigned by 07 is notified of completion to the central processing unit 10.

If the reception data allocation means 207 does not have one or both of the reception request 205 from the central processing unit 10 and the reception buffer 201 that received data from the peripheral device 30, the reception data allocation means 207 ends without doing anything, and the peripheral The control device F20 then activates the reception requesting means 101 of the central processing unit 10 or receives data from the peripheral device 30, thereby receiving peripheral processing.

The reception control means of the station 30 is realized.

As described in detail, according to the present invention, it is possible to issue a receive request to a peripheral device using a receive buffer in the peripheral control device when initializing the peripheral control device and when receiving data from the peripheral device. Furthermore, by making it possible for the peripheral control device to hold received data from the peripheral device, and by making it possible for the peripheral control device to issue a receive request to the peripheral device asynchronously with the receive request from the central processing unit, Even if the load on the central processing unit increases, a reception request is issued to the peripheral control unit, so there is no possibility that the peripheral control unit cannot receive data received from the peripheral, and data loss on the central processing unit side is prevented. It will no longer occur.

[Brief explanation of drawings]

FIG. 1 is an overall block configuration diagram showing an embodiment of the present invention;
Fig. 2 is a processing block diagram when an initial setting request means is issued from the central processing unit, Fig. 3 is a processing block diagram when a reception request means is issued from the central processing unit, and Fig. 4 is a processing block diagram when a reception request means is issued from the central processing unit. FIG. 3 is a processing configuration diagram when receiving data is received. lO...Central processing unit, 20...Peripheral control device, 3
0...Peripheral device, 40...Main storage device, 101...
- Initial setting requesting means, 102...reception requesting means, 20
1... Reception buffer, 202... Initial setting means, 2
03...Reception means, 204...Reception data holding means, 205...Reception request, 206...Reception request holding means, 207...Reception data allocation means, 208...
・Transfer means, 209...Reception buffer return means, 21
0...Reception completion notification means

Claims (1)

[Claims] In a system in which a central processing unit controls a peripheral device via a peripheral control device, an initial setting request means for requesting initial settings of the peripheral control device from the central processing unit to the peripheral control device; Initial setting means for initializing the inside of the peripheral control device based on a request, and issuing a reception request to the peripheral device using a receive buffer in the peripheral control device during initial setting and when receiving data from the peripheral device. a receiving means; a received data holding means for holding received data from a peripheral device received by the receiving means;
A reception request means for requesting reception from the central processing unit to the peripheral control device, a reception request holding means for holding the reception request issued from the central processing unit, and the received data holding means and the reception request holding means. a received data allocating means that allocates the received data held by the received data holding means to the received request that is activated and is held by the received request holding means; a transfer means for transferring the received data to the transfer means; a reception buffer return means for transferring the received data and returning the unnecessary reception buffer after the transfer of the received data is completed by the transfer means; and the reception data allocation means after issuing the reception buffer return means. 1. A reception control method for a peripheral device, comprising reception completion notification means for notifying the central processing unit of completion of a reception request from a central processing unit to which reception data has been allocated.