D-link Corporation

Asix Electronics Corporation

Ming-Chun Su

Chung-Wang Lee

Yu-Ping Chung

Kwang-Lay Chen

Ching-Ju Hsin

Po-Cheng Huang

Pao-Hsuan Tseng

Tsung-Mong Shen

The invention relates to a virtual I/O device coupled to a memory controller in a microprocessor of computer, the virtual I/O device and a memory unit being in communication with the memory controller via a common interface so that any of a plurality of peripherals is capable of coupling to an arithmetic and logic unit (ALU) in the microprocessor via the virtual I/O device and the memory controller sequentially, and an excessive time spent on a processing of request and acknowledgement in handshake while packets being received or transmitted between a conventional I/O device and the I/O interface in the microprocessor is significantly reduced.

Virtual I/O device coupled to memory controller

A fan speed detecting circuit includes a resistor installed in the grounding line of the power circuit of the DC fan motor of a cooling fan, a capacitor, a diode connected between the resistor and the capacitor, and a comparator having an inverter terminal connected to the output end of the diode through the capacitor and a non-inverter terminal connected in parallel to the input end of the diode, wherein a transient pulse current is produced at the resistor upon operation of the DC fan motor, causing the comparator to output a pulse frequency wave indicative of the revolving speed of the DC fan motor.

Fan speed detecting circuit

Growing community of inventors

Hsinchu, Taiwan

Ming-Chun Su