JPH02310656A - Local channel control device - Google Patents

Abstract

PURPOSE:To reduce hardware quantity, and to shorten transferring time by providing a data buffer, a means to detect frame data quantity, and a comparing means, and providing the means which inhibits the sending of frame data to a remote channel control device when a compared result coincides. CONSTITUTION:Every time the frame data of small capacity transferred continuously from a remote channel control device 2 is received, a data frame is stored by the data buffer 10 of a local channel control device, and is sent successively to a main storage device. The data quantity from the remote channel control device 2 is calculated by a subtracter 14, and when concidence between this result and a prescribed value is detected by the comparator 15, a control frame is sent from a buffer control circuit 16 so that the transfer of the data frame of the remote channel control device 2 is inhibited, and the data is transferred continuously from the remote channel control device 2 to the local channel control device 1.

Description

TECHNICAL FIELD The present invention relates to a local channel control device, and more particularly to a data buffer control method for a local channel control device connected to a remote channel control device via a serial interface.

Prior Art Conventionally, in this type of data buffer control system, a local channel control device is provided with a data buffer whose capacity matches the transfer speed and amount of data transferred by the remote channel control device, and this data buffer is used for remote channel control. Data was being transferred from the device in batches.

In this conventional data buffer control method, data is transferred from the remote channel controller to the data buffer of the local channel controller in batches.
This method requires a large-capacity data buffer to store data transferred in batches from the remote channel control device, and has the disadvantage that the amount of hardware in the local channel control device increases significantly.

Additionally, if data exceeding the capacity of the local channel control device's data buffer is transferred from the remote channel control device, the data must be transferred multiple times, significantly increasing the transfer time. There are drawbacks.

OBJECTS OF THE INVENTION The present invention has been made to eliminate the drawbacks of the conventional devices as described above, and provides an I/O device for a local channel control device that can reduce the amount of hardware and shorten the transfer time.
The purpose is to serve Jl.

Configuration of the Invention A local channel control device according to the present invention is a local channel control device that controls data transfer between a remote channel control device and a main storage device, and the data is continuously sent from the remote channel control device. a data buffer for sequentially accumulating small-capacity frame data and sequentially transmitting the frame data to the main storage device; a detection means for detecting the amount of the frame data accumulated in the data buffer; a comparison means for comparing the detected data amount and a predetermined value set in advance, and when the comparison result of the comparison means shows a match, the remote channel control device is configured to suppress transmission of the frame data. The present invention is characterized in that it includes a sending means for sending out unique frame data.

Embodiment Next, an embodiment of the present invention will be described with reference to the drawings.

FIG. 1 is a block diagram showing the configuration of one embodiment of the present invention. In the figure, a local channel control device 1 is connected to a remote channel control device 2 via an optical fiber cable 100.

The data buffer 10 of the local channel control device 1 receives small-capacity frame data (for example, 8-byte frame data) (hereinafter referred to as a data frame) continuously transferred from the remote channel control device 2. It stores data frames and sequentially sends the data frames to a main storage device (not shown).

A data transfer control circuit 11 controls a data buffer 10, a read address register (RAR) 12, and a write address register (WAR) 13, respectively.

A read address register 12 and a write address register 13 each supply a read address and a write address to the data buffer 10, and the data transfer control circuit 11
Its contents are updated under the control of

A subtracter (SUB) 14 takes the difference between the value of the read address register 12 and the value of the write address register 13,
The data amount of the data frame stored in the data buffer 10 is calculated and sent to the comparator 15.

The comparator 15 compares the data amount of the data frame stored in the data buffer 10 with a predetermined value,
The comparison result is sent to the buffer control circuit 16.

The buffer control circuit 16 sends specific frame data (for example, frame data of all "θ' in 1 l<ite") (hereinafter referred to as a control frame) to the remote channel control device 2 according to the comparison result of the comparator 15. do.

The selector 17 selects one of the data from the main storage device and the control frame from the buffer control circuit 16 under the control of the buffer control circuit 16 and sends it to the parallel-to-serial converter (P-S) 18 .

The parallel-to-serial converter 18 receives data from the main memory sent from the selector 17 or buffer 1ill.
The control frame from the 1m circuit 16 is subjected to parallel-to-serial conversion, and the data is sent to the serial-to-parallel converter (S-P) 25 of the remote channel control device 2 via the driver 18a and the optical fiber cable 100.

A serial-to-parallel converter (S→P) 19 performs serial-to-parallel conversion of a data frame from the remote channel control device 2 received by the receiver 19a via the optical fiber cable 100, and transfers the data frame to the data buffer 10 and data transfer control. The signal is sent to the circuit 11.

The data buffer 20 of the remote channel control device 2 receives data from the main storage device via the receiver 25a, the serial-to-parallel converter 25, and the receiving register 27, or the data from the peripheral device (which is received via the receiver 28 and the receiving register 24). (not shown) is stored via the selector 23, data from peripheral devices is sent to the local channel control device 1 via the parallel-to-serial converter (P-3) 26 and the driver 26a, and the main memory The data is sent to the peripheral device via the driver 29.

Data transfer control circuit 21 controls data transfer between the main storage device and peripheral devices.

The decoder 22 detects the control frame sent from the buffer control circuit 16 of the local channel control device 1,
The detection result is sent to the data transfer control circuit 21.

The selector 23 selects one of data from the main storage device received via the receiver 25a, serial-parallel converter 25, and reception register 27, and data from the peripheral device received via the receiver 28 and reception register 24. is selected under the control of the data transfer control circuit 21, and the selected data is sent to the data buffer 20.

The serial-to-parallel converter 25 performs serial-to-parallel conversion on the data from the main storage device or the control frame from the local channel control device 1 received via the receiver 25a, and sends the data to the decoder 22 and the reception register 27.

The parallel-to-serial converter 26 performs parallel-to-serial conversion of data from the peripheral device stored in the data buffer 20, and converts the data into a data frame to the driver 26.
a and the optical fiber cable 100 to the serial/parallel converter 19 of the local channel control device 1.

Next, the operation of one embodiment of the present invention will be explained using FIG.

Data from main memory is local channel controller 1
The signal is sent to the remote channel control device 2 via the selector 17, the parallel-to-serial converter 18, and the driver 18a.

In the remote channel control device 2, the serial-to-parallel converter 25 performs serial-to-parallel conversion of data received from the main storage device via the receiver 25a, and the data is temporarily held in the reception register 27.

The data temporarily held in the reception register 27 is sent to the selector 2.
3 and is stored in the data buffer 20 via the driver 2
9 to the peripheral device.

Data from the peripheral device is received via the receiver 28 of the remote channel control device 2, temporarily held in the reception register 24, and then stored in the data buffer 20 via the selector 23.

The data from the peripheral device stored in the data buffer 20 is subjected to parallel-to-serial conversion by the parallel-to-serial converter 26, and the driver 26a and the optical fiber cable 1
00 to the local channel control device 1 as a data frame.

In the local channel control device 1, a serial-to-parallel converter 19 performs serial-to-parallel conversion on the data frame received from the remote channel control device 2 via the receiver 19a, and the data frame is transferred to the data buffer 10 and the data transfer control circuit 11. Send to.

The data frame subjected to serial-parallel conversion by the serial-parallel converter 19 is stored in the data buffer 10 under the control of the data transfer control circuit 11, and then read out under the control of the data transfer control circuit 11 and sent to the main storage device.

At this time, each time a data frame from the remote channel control device 2 is written to the data buffer 10 under the control of the data transfer control circuit 11, "1" is added to the value of the write address register 13, and the data frame is transferred from the data buffer 10. "1" is added to the value of the read address register 12 each time the address is read and sent to the main memory.

Every time "1" is added to the value of the read address register 12 and the value of the write address register 13, the difference between these values is taken by the subtractor 14 and the amount of data of the data frame stored in the data buffer 10 is calculated. Calculated.

The data amount of the data frame stored in the data buffer 10 calculated by the subtracter 14 is compared with a predetermined value set in advance by a comparator 15.

When a match is detected by the comparison in the comparator 15, the buffer control circuit 16 generates a control frame to suppress the transfer of the data frame from the remote channel control device 2 to the local channel control device 1, and is sent to the remote channel control device 2 via the selector 17, parallel-to-serial converter 18, and driver 18a.

In the remote channel control device 2, when the decoder 22 receives the control frame via the receiver 25a and the serial-parallel converter 25, the decoder 22 detects the control frame and notifies the data transfer control circuit 21 of the detection result. be done.

When the data transfer control circuit 21 is notified by the decoder 22 that the control section frame has been detected, the data transfer control circuit 21 recognizes the busy state of the data buffer 10 of the local channel control device 1 based on the notification, and transfers data to the local channel control device 1. Suppress data frame transfer.

In this way, the remote channel controller is stored in the data buffer 10 of the local channel controller 1! The amount of data of the data frame from 2 is calculated by the subtracter 14, and if the calculation result matches a predetermined value set in advance, the comparator 1
5, the buffer control circuit 16 sends a control frame to the remote channel control device it2 to suppress the transfer of data frames from the remote channel control device 2. Since data can be continuously transferred from the remote channel control device 1 to the local channel control device 1, even when data exceeding the capacity of the data buffer 10 of the local channel control device 1 is transferred from the remote channel control device 2,
There is no need to transfer data in multiple batches, and the transfer time can be significantly reduced.

Furthermore, since data can be continuously transferred from the remote channel control device 2 to the local channel control device 1, the capacity of the data buffer 10 of the local channel control device 1 can be adjusted to an amount corresponding to the transfer rate of the remote channel control device 2. Therefore, the amount of hardware in the local channel control device 1 can be significantly reduced.

DETAILED DESCRIPTION OF THE INVENTION According to the present invention, the amount of small-capacity frame data accumulated in the data buffer of a local channel control device and continuously transmitted from a remote channel control device is detected, and When the amount of data matches a predetermined value, unique frame data is sent to the remote channel control device to suppress the sending of frame data.
This has the effect that the amount of hardware in the local channel control device can be reduced and the transfer time can be shortened.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing the configuration of one embodiment of the present invention. Explanation of symbols of main parts 1...Local channel control device 2...
・Remote channel control device 10... Data buffer 11... Data transfer control circuit 14... Subtractor 15... Comparator 16... Buffer control circuit 21...Data transfer control circuit 22...Decoder

Claims (1)

[Claims] (1) A local channel control device that controls data transfer between a remote channel control device and a main storage device, and which sequentially stores small-capacity frame data that are continuously sent from the remote channel control device. , a data buffer for sequentially sending the frame data to the main storage device, a detection means for detecting the amount of the frame data accumulated in the data buffer, and a data amount detected by the detection means and a preset value. a comparison means for comparing the predetermined value with a predetermined value; and a sending means for sending specific frame data to the remote channel control device to suppress sending of the frame data when the comparison result of the comparing means indicates a match. A local channel control device characterized in that: