【発明の名称】データ転送の異常検出装置

Japanese Patent JP3115113

B2

A data transfer control system for a computer can prevent destructive read out of data from an external storage unit during a data transfer operation. To control transfer of a series of data between a first storage unit (5) having a first storage capacity and a second storage unit (1) of a computer, having a second storage capacity typically smaller than the first storage capacity, the apparatus employs a first buffer memory (29) for temporarily storing the series of data read out from the first storage unit, a second buffer memory (29) for temporarily storing the series of data transferred from the first buffer memory means, and a buffer checking/controlling unit for checking whether or not a storage condition of the second buffer memory means corresponds to an empty state. An empty flag is set when the second buffer memory (29) becomes empty. The buffer checking/control unit also controls transfer of the series of data from the first buffer memory (21) to the second buffer memory (29) and from the second buffer memory (21) to the second storage means of the computer in such a way that if, after the series of data is read out from the first storage unit (1) to the second storage unit (1), the empty flag is not set, an abnormal data transfer signal is issued to prevent destructive data read out from the first storage unit (5). Another embodiment comprises the last words of first and second buffer memories (21, 19) and, if they fail to coincide, issues an abnormal data transfer signal. The embodiments can be used separately or together.

Hiroyuki Kaneko

JP22673292A

December 04, 2000

August 26, 1992

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Toshiba Corporation

G06F3/06; G06F11/00; G06F11/30; G06F12/16; G11B20/18; G06F11/16; (IPC1-7): G06F11/00; G06F3/06; G06F11/30; G06F12/16

JP378017A

Hidekazu Miyoshi (1 outside)

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