Apparatus and method for controlling a suspending mode in a USB control system
AssigneeSamsung Electronics Co., Ltd.
InventorsChoong-Bin Lim, Sang-Jun Mun
Life of this patent
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Abstract
A USB control system includes a first voltage controller, a control switch, a second voltage controller, and a PHY unit. The first voltage controller outputs a first internal voltage from an external voltage and a reference voltage, and the control switch regulates supplying and suspending the external voltage. The second voltage controller outputs a second internal voltage from the reference voltage and the external voltage applied through the control switch, and the PHY unit receives a request from a host using the first or second internal voltage as a voltage source. The power for certain internal blocks is suspended to reduce power consumption in the USB control system during a power-saving mode.
Claims24
A bus control system comprising:
- a first voltage adjuster receiving an external voltage and a reference voltage and generating a first internal voltage;
- a control switch controlling a supply and an interruption of the external voltage;
- a second voltage adjuster receiving the reference voltage and the external voltage supplied through the control switch and generating a second internal voltage;
- and
- a physical layer (PHY) unit receiving a request from a host, using one of the first and second internal voltages as a power source.
A method for controlling a suspending mode in a bus control system, comprising:
- receiving a request from a host;
- turning an operation to the suspending mode in response to an absence of another request from the host for a predetermined time;
- supplying a first internal voltage always in the suspending mode;
- and
- interrupting a second internal voltage in the suspending mode, in accordance with internal blocks of the system.
Dependencies are inferred from the claim text.