Via Technologies, Inc.

Weber Chuang

Chi Hao Chang

Bo-Wei Hsieh

Ming-Shi Liou

Hung-Yi Kuo

Hui-Mei Chen

A method for detecting the data strobe signal from a Double Data Rate (DDR) Synchronous Dynamic Random Access Memory (SDRAM). The method executes a data reading process at first and records the latency period of the data read process to be a basis for detecting the arrival timing of the preamble in the data strobe signals in the subsequent data reading process.

Method for detecting data strobe signal

A switching circuit located in a computer system is disclosed in the present invention. The switching circuit comprises a first phase-locked loop generating a first host clock signal, a second phase-locked loop generating a second host clock signal and an output switch unit coupled to the first PLL and the second PLL. When the computer system operates in a first mode, the output switch unit chooses the first host clock signal to be a fundamental clock signal of the front side bus. In the other hand, when the computer system operates in a second mode, the output switch unit chooses the second host clock signal to be a fundamental clock signal of the front side bus.

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Taipei, Taiwan

Weber Chuang