Fujitsu Corporation

Takemi Kimura

Masahiro Hatta

Hiroyuki Egawa

Yoshifumi Ogi

Satoshi Sue

Akira Takakusagi

An interface control device controls the packet-type transfer of data between one or more computers and one or more input/output devices. According to one embodiment of the present invention, when the interface control device receives the lead packet in a series of packets from an input/output device, it creates new device control data to control the transfer of the series of packets, and also determines an identification number for the particular series of packet transfers. The interface control device then sends a notification packet, containing the identification number, to the sending input/output device in response to receiving the lead packet. When the interface control device receives a packet that is a second or subsequent packet in the series of packets, it determines whether the data stored in the packet are normal by referring to the device control data corresponding to the identification number stored in the subsequent packet. The transfer control unit continues the data transfer as long as the packets received are determined to be normal. If a packet is abnormal, the transfer control unit ends data transfer and notifies the sending input/output device. The present invention allows the transfer of packets from an input/output device to be interrupted so that data can be transferred from more than one input/output device in a certain amount of time, eliminating the need for input/output devices to wait in standby mode before being able to transfer data.

Interface control device and computer system for controlling data transfer

A data processing system has a dynamic address translation function for dynamically translating virtual addresses into real addresses and processes data. The system employs a plurality of control registers for managing the developed addresses of address translation tables and a selector for selecting one of the control registers. The control register selected by the selector specifies one of the address translation tables, which is used to dynamically translate a virtual address into a real address.

Data processing system with dynamic address translation function

An I/O interface control method and data processing equipment each of which can avoid data destruction in an I/O unit even when a channel control unit is in a check/stop state. When an abnormal state notification signal from the channel control unit has been received, the channel element completes an I/O operation in execution to halt a transmission to a new I/O operation. When the abnormal state notification signal delayed by a predetermined time has been received, the main storage control unit separates the channel control unit from the channel element to halt the data transmission. The present invention can be applicable to computer systems each including a DASD acting as an I/O unit.

Growing community of inventors

Kawasaki, Japan

Takemi Kimura