Holtek Semiconductor Corp.

Chuen-An Lin

Min-Kun Wang

Jia-Hsuan Wu

Ching-Tsung Tung

Min-Shing Wu

Min-Hsiung Hu

The present invention provides a memory device and a method for accessing the memory device thereof. The memory device comprises an address encoding selector for selecting one of plurality of encoding circuits which encodes a first address into a second address, and a data decoding selector for selecting one of plurality of decoding circuits which decodes a first data corresponding to the second address into a second data and a non-volatile memory, coupled to address encoding selector and the data decoding selector, for storing the first data. The method for accessing the memory device comprises encoding a first address into a second address by an address encoding selector, and decoding a first data corresponding to the second address into a second data by a data decoding selector, wherein the first data being stored in the non-volatile memory.

Read-only memory device with securing function and accessing method thereof

The present invention discloses a synchronizing device for real-time USB audio data transmission, comprising: a first adder unit, a start-of-frame countdown unit, a phase-locked loop circuit, a frequency divider, a second adder unit, a third adder unit, a fourth adder unit, a frame calibrating register unit, a calibrating mapping unit and a calibrating pulse generating unit. A start-of-frame token sent by the USB host is used as a 1-ms reference cycle so that a high-frequency clock passes through the frequency divider to issue a first clock. The first clock signal has a constant clock number in a USB start-of-frame. The absolute time is automatically adjusted according to the duration of a previous start-of-frame. Therefore, asynchronicity of data transmission between the USB host and external devices can be overcome.

Synchronizing device for USB real-time audio data transmission

A universal series bus (USB) frequency synchronous apparatus using a start of frame (SOF) signal generated by a master device to mark a reference interval is disclosed. The frequency synchronizing apparatus includes a frequency divider, a counter unit with a default pulse number, an arithmetic unit, and an adjusting unit. The frequency divider divides a high frequency signal by a variable frequency factor to generate a lock frequency signal. The counter is used to detect a pulse number of the lock frequency signal at a reference interval and obtain a pulse difference between the default pulse number and the detected pulse number of the lock frequency signal.

USB frequency synchronizing apparatus and method of synchronizing frequencies

The present invention discloses a detection control circuit for preventing a leakage current, which comprises a register unit comprising a clock signal input terminal for receiving a clock signal; a reset signal input terminal, for receiving a reset signal; a signal generating terminal, for generating a logic signal; and a logic gate, coupled to said register unit, comprising a first signal input terminal for receiving said logic signal; a second signal input terminal for receiving a control signal; and a signal output terminal, for outputting an output signal according to said logic signal and said control signal; wherein said control signal controls said logic gate so as to keep said output signal to be in a fixed state which detects a leakage current in an integrated circuit due to the process flaw.

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Hsinchu, Taiwan

Chuen-An Lin