COMMUNICATION UNIT, COMMUNICATION SYSTEM, AND CONTROL METHOD OF COMMUNICATION UNIT

PROBLEM TO BE SOLVED: To provide a communication unit, a communication system, and a control method of the communication unit which enable communication between devices to be adequately performed even if the devices have different clock frequencies.SOLUTION: A clock isolation function separates a ca...

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Main Authors SATO TETSUYA, TAKEO MITSUHARU, IKEDA JUNICHI, TERAO NORIYUKI, SUZUKI NOBORU, YAMAMOTO HIDEAKI, TAKAHASHI HIROYUKI, SASAKI YUKIMOTO
Format Patent
LanguageEnglish
Published 02.02.2012
Subjects
CALCULATING
COMPUTING
COUNTING
ELECTRIC COMMUNICATION TECHNIQUE
ELECTRIC DIGITAL DATA PROCESSING
ELECTRICITY
PHYSICS
TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHICCOMMUNICATION
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Summary:PROBLEM TO BE SOLVED: To provide a communication unit, a communication system, and a control method of the communication unit which enable communication between devices to be adequately performed even if the devices have different clock frequencies.SOLUTION: A clock isolation function separates a card edge side port of a PCI Express bridge chip 13 and an optical cable side port as domains operating separate clocks, and a clock (first clock) used in the optical cable side port is supplied from a clock source 14 on a PCI Express/optical cable conversion board 10. A communication unit acquires a clock (second clock) of a printer 400 to be a communication connection destination, and if the frequency of the first clock generated by the clock source 14 is different from the frequency of the second clock, a frequency adjustment unit 15 adjusts in such a way that the first clock frequency will correspond to the second clock frequency.
Bibliography:Application Number: JP20100160047