Silicon Integrated Systems Corporation

Te-Lin Ping

Ming-Hsien Lee

Yi-Hung Chen

Tsan-Hwi Chen

Chia-Hsien Chou

A power-saving method of continuous display and effective cost in a system that includes memory directly accessed by a CPU and at least one display device within vertical blanking. The method includes the following steps: issuing a Power-saving related message; dropping the Power-saving related message, wherein a Power-saving related flag is not set; setting the Power-saving related flag; setting a VID/FID pending bit in the CPU, wherein the vertical blanking of the display/displays occurs and clearing the Power-saving related flag, wherein the Power-saving related flag is set, and executing a power saving process.

Power saving method

A memory read/write arbitration method is disclosed. The memory read/write arbitration method, which is utilized in a memory controller for increasing row hit rate and decreasing the delay of memory access, comprises: providing a arbitrator; providing a read request fifo queue having command read requests; providing a write request fifo queue having command write requests; performing a judgment step for generating a priority, wherein the judgment step comprises: performing a first sub-judgment step to determine that a command read request of the command read requests has priority over a command write request of the command write requests, or the command write request can be forwarded to a second sub-judgment step under adaptive first-step conditions; performing the second sub-judgment step to determine the read request has priority over the command write request from the first sub-judgment step, or the command write request from the first sub-judgment has priority over the command read request. Therefore, by the memory read/write arbitration method of the present invention, the row hit rate and the bandwidth utilization of memory module are increased through the applied judgment step.

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Tao-Yuan, Taiwan

Te-Lin Ping