SYNCHRONIZATION METHOD OF CLOCK INFORMATION IN DUPLEX DEVICE, DUPLEX DEVICE AND SYNCHRONIZATION PROGRAM

Japanese Patent JP3726043

B2

PROBLEM TO BE SOLVED: To synchronize clock ICs of an operation system and a waiting system with each other at every arbitrary time interval or when there is a difference more than a predetermined time difference between time information data of control systems of the operation system and the waiting system.
SOLUTION: This synchronization method has: a means for reading the clock information of the operation system at a predetermined time interval by an operation system device control part 01 to register it in DPM 21 and DPM 22; a means for obtaining the clock information of the operation system from the DPM 22 at a predetermined time interval by a waiting system device control part 02; a means for determining, by the control part 02, whether or not a predetermined reset time interval is reached by comparing the obtained clock information of the operation system with time information at the last reset time recorded in a RAM provided for the control part 02; a means for resetting the time information of the waiting system in the clock IC 32 in accordance with the clock information of the operation system by the control part 02 when the reset time interval is reached; and a means for storing the clock information in the RAM by the control part 02 after resetting the clock information of the waiting system.

Noriyuki Yamaguchi

JP2001276877A

December 14, 2005

September 12, 2001

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NEC Personal Products Co., Ltd.

G04G7/00; G06F1/04; G06F1/14; G06F11/20; G06F15/177; H04L7/00; (IPC1-7): G06F1/14; G04G7/00; G06F1/04; G06F11/20; G06F15/177; H04L7/00

JP2071354A
JP10228330A
JP9054630A
JP9198158A
JP56066889U

Masahiko Desk
Masashi Kudo
Yasuhisa Tanizawa

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