Sharp Kabushiki Kaisha Corporation

Futoshi Miyamae

Souichi Miyata

Daisuke Azuma

Satoshi Matsumoto

Manabu Onozaki

In a data-flow type computer using paired data, the improvement of a data transmission apparatus wherein the difference in the number of data pieces written in a memory and the number of data pieces read out from the memory is determined. If this difference exceeds a predetermined number, a transmission inhibiting signal is generated from an inhibiting signal generating portion to be applied to a merging portion, wherein the merging portion temporarily inhibits the merging of data from an external data memory or external information processing unit and then allows for the merging of data when the difference becomes less than the predetermined number.

Data driven computer producing inhibit signal for inhibiting merging

An interface system for controlling data transmission from a first information processing unit to a second information processing unit includes a handshaking type data transmission path. The handshaking type data transmission path includes a first interface circuit and a second interface circuit. A transmission signal output from the first information processing unit passes the first interface circuit, is then waveform-shaped by the second interface circuit and applied to the second information processing unit. A transmission acknowledging signal output from the second information processing unit passes the first interface circuit and is applied to the first information processing unit. Thus, the timing skews of the signals in the data transmission paths between the first and second information processing units can autonomously be adjusted, thereby preventing further transmission of a transmission signal.

Adaptive interface that automatically adjusts for timing skews caused by

A first-in first-out type memory is used as a buffer for data transfer between asynchronous systems. This buffer memory has a minimum delay elastic buffer function in which the number of data storage stages is changed according to the data transfer situation in an output portion of the memory. The data storage memory includes a folded type data transmission path with a going path and a returning path respectively provided with data storage devices of the same number, bypassing paths for coupling corresponding data storage devices in the going path and the returning path, and a valid data detector provided corresponding to each of the bypassing paths for detecting the presence or absence of valid data in a data storage device closer to an input/output portion than a corresponding bypassing path and making the bypassing path enabled or disabled according to the result of the detection.

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Tenri, Japan

Futoshi Miyamae