Control device, display device, and method for controlling memory power-saving state
AssigneeSeiko Epson Corporation
InventorsNozomi Sato, Motoki Ueda
Life of this patent
Estimating the term…
Abstract
A processor controlling access to a memory includes: a physical layer controller executing data access to the memory; a memory controller accepting an access request to the memory from a plurality of bus masters and causing the physical layer controller to execute the access request; and a CPU. The CPU shifts the memory controller into a busy state to accept the access request and stand by for execution, when a condition to turn the memory into a power-saving state is satisfied. The CPU executes control to turn the memory into the power-saving state, with the memory controller being in the busy state.
Claims7
A control device controlling access to a memory, the control device comprising:
- a memory interface unit executing data access to the memory;
- a memory controller accepting an access request to the memory from a plurality of bus masters and causing the memory interface unit to execute the access request;
- and
- a memory controller management unit, wherein
- the memory controller management unit shifts the memory controller into an execution standby state to accept the access request and stand by for execution, when a condition to turn the memory into a power-saving state is satisfied,
- the memory controller management unit causes the memory interface unit to execute control to turn the memory into the power-saving state, with the memory controller being in the execution standby state,
- the memory interface unit executes access to the memory, using correction data acquired by executing calibration,
- the memory controller management unit acquires and saves the correction data of the memory interface unit before the memory shifts into the power-saving state, and changes the correction data of the memory interface unit, and
- when the memory returns from the power-saving state into a normal operation state, the saved correction data is set in the memory interface unit.
A display device comprising:
- a memory storing image data;
- a processor accessing the memory and processing the image data;
- and
- a display unit displaying an image based on the image data, wherein
- the processor includes a data processing unit processing the image data,
- the processor functions as a control device controlling access to the memory in response to an access request to the memory from the data processing unit,
- the processor includes:
- a memory interface unit executing data access to the memory;
- a memory controller accepting an access request to the memory from the data processing unit and causing the memory interface unit to execute the access request;
- and
- a memory controller management unit, wherein
- the memory controller management unit shifts the memory controller into an execution standby state to accept the access request and stand by for execution, when a condition to turn the memory into a power-saving state is satisfied,
- the memory controller management unit causes the memory interface unit to execute control to turn the memory into the power-saving state, with the memory controller being in the execution standby state,
- the memory interface unit executes access to the memory, using correction data acquired by executing calibration,
- the memory controller management unit acquires and saves the correction data of the memory interface unit before the memory shifts into the power-saving state, and changes the correction data of the memory interface unit, and
- when the memory returns from the power-saving state into a normal operation state, the saved correction data is set in the memory interface unit.
A method for controlling a memory, using a memory interface unit executing data access to the memory, and a memory controller accepting an access request to the memory from a plurality of bus masters and causing the memory interface unit to execute the access request, the method comprising:
- shifting the memory controller into an execution standby state to accept the access request and stand by for execution, when a condition to turn the memory into a power-saving state is satisfied;
- causing the memory interface unit to execute control to turn the memory into the power-saving state, with the memory controller being in the execution standby state;
- executing access to the memory, using correction data acquired by executing calibration;
- acquiring and saving the correction data before the memory shifts into the power-saving state, and changes the correction data;
- and
- when the memory returns from the power-saving state into a normal operation state, setting the saved correction data in the memory interface unit.
Dependencies are inferred from the claim text.