Electrical computers and digital data processing systems: input/ – Intrasystem connection – Bus expansion or extension
Reexamination Certificate
2005-04-05
2005-04-05
Rinehart, Mark H. (Department: 2112)
Electrical computers and digital data processing systems: input/
Intrasystem connection
Bus expansion or extension
C710S302000, C713S324000
Reexamination Certificate
active
06877058
ABSTRACT:
An information processing unit is adapted to connect a USB device provided on a board to a USB host controller only when it is actually used. Based on a signal regarding an n-th pin received from a USB MEMORYSTICK slot provided in a board, a monitoring program detects whether a MEMORYSTICK has been inserted. The monitoring program causes a hardware bus switch to turn ON if the presence of the MEMORYSTICK is detected, or causes the hardware bus switch to turn OFF if the absence of the MEMORYSTICK is detected. If the hardware bus switch is turned ON, the USB host controller is electrically connected to a USB MEMORYSTICK slot through a USB bus; therefore, the USB host controller detects the USB MEMORYSTICK slot. If the hardware bus switch is turned OFF, the USB host controller is electrically disconnected from the USB MEMORYSTICK slot, so that it does not detect the USB MEMORYSTICK slot.
REFERENCES:
patent: 6168077 (2001-01-01), Gray et al.
patent: 6385677 (2002-05-01), Yao
patent: 6557106 (2003-04-01), Yuzawa et al.
patent: 6567875 (2003-05-01), Williams et al.
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Iguchi Akira
Saito Junko
Sato Takashi
Suzuki Masahiko
Yamaji Hidenori
Kananen Ronald P.
Knoll Clifford
Rinehart Mark H.
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