US 6,983,384 B2
Graphics controller and power management method for use in the same
Tsutomu Iwaki, Hanno (Japan)
Assigned to Kabushiki Kaisha Toshiba, Tokyo (Japan)
Filed on Aug. 30, 2001, as Appl. No. 9/941,861.
Claims priority of application No. 2000-263874 (JP), filed on Aug. 31, 2000.
Prior Publication US 2002/0032877 A1, Mar. 14, 2002
Int. Cl. G06F 1/26 (2006.01); G06F 1/32 (2006.01)
U.S. Cl. 713—300 15 Claims
OG exemplary drawing
 
1. A graphics controller for controlling a display monitor of a computer, comprising:
a register configured to be accessed through a bus of the computer and to store state control data designating a state that the graphics controller is to assume;
a logic unit configured to operate in a working state and a low power-consumption state and to transit to the working state or the low power-consumption state in accordance with the state control data stored in the register; and
a switch provided between the register and the logic unit and configured to prohibit the state control data designating the low power-consumption state from being transmitted from the register to the logic unit, thereby to maintain the logic unit in the working state.