Mediatek Corporation

Tse-Hong Wu

Shih-Hsin Chen

Shih-Ta Hung

Yuan-Ting Wu

Ming-Hung Lee

KuanYu Lai

Ping-Sheng Chen

Tai-Liang Lin

Liang-Yun Wang

Kuan Yu Lai

An optical disc drive is provided, mainly comprising a buffer, a processor and a driving module for accessing an optical disc. The optical disc drive receives a plurality of write commands. Each write command comprises a data block and a destination address. The buffer buffers data blocks to be recorded to the optical disc with corresponding write commands in either a random mode or a sequential mode. The processor schedules a recording operation based on the write commands, and selectively switches the buffer to the random mode or to the sequential mode based on arrangements of data blocks buffered in the buffer. The driving module is controlled by the processor to perform the recording operation, whereby the data blocks are recorded to the optical disc when a start recording condition is met. Specifically, the start recording condition varies with the random or sequential modes.

Buffer management method and optical disc drive

A random access control method is provided, implemented in an optical disc drive for recording data to an optical disc. In the optical disc drive, a buffer stores a plurality of write commands each associated with a data block bound to a destination address. A processor controls the buffer to build a disc write task from the write commands in which addresses are organized in order. A drive unit is controlled by the processor, performing a recording operation to record the data blocks to the optical disc according to the disc write task; wherein the processor further controls the drive unit to verify the recorded data blocks after completing the recording operation.

Random access control method and optical disc driver

An embedded system and an interruption handling method are provided. A plurality of interruption requests are received, and corresponding service routines are triggered with priority control. In the embedded system, a memory device comprises a plurality of service routines stored at different entry addresses, each related to an interruption request. A processor receives an enable signal to initialize one of the service routines through a branch instruction. A control unit buffers the interruption requests to schedule executions of corresponding service routines. When a specific service routine is to be executed, the control unit provides the branch instruction pointing to entry address of the specific service routine and asserts the enable signal to the processor, such that the processor executes the branch instruction to initialize the specific service routine.

Embedded system and interruption handling method

Random access control method and optical disc drive

A method for accessing data of an optical disk with a disk drive. The drive includes a memory; the optical disk has a plurality of data blocks for recording data and a plurality of spare blocks for replacing defect data blocks. While reading data recorded on the optical disk, a predetermined number of data blocks are read, then spare blocks for replacing defect data blocks among the predetermined number of data blocks are read. While writing data onto the optical disk, a predetermined number of data blocks are written, then data written in defect blocks among the predetermined number of defect blocks are written in corresponding spare blocks. The predetermined numbers are determined by a memory capacity of the memory, or a progress of the reading or writing.

Memory manage method for defect management of an optical disk

A method comprises utilizing an optical disk drive to manage defects on an optical disk. When a targeted block is defective, the method writes all data in an original packet to an alternative packet without temporarily storing the data in a memory of the optical disk drive, thereby saving memory resources.

Method for managing defects on an optical disk

A method for accessing data on an optical disk by a drive. The optical disk includes spare packets and data blocks. Each data block is for recording data written to the optical disk, and each spare packet has spare blocks for replacing defect blocks to record data. The drive has a memory allocated with buffers, and each buffer is for recording data of a spare packet. When writing data of a first buffer to a packet of the optical disk, if a plurality of first spare blocks are found defective, then searching a second spare packet which has spare blocks for replacing the first blocks. If the second spare packet is not read in a buffer, reading the second spare packet into a releasable buffer. After copying data written to the first spare blocks from the first buffer to the second buffer, making the first buffer releasable.

Method for managing defects of optical disk

The invention provides read/write methods for a CD-MRW (Mount Rainier ReWrite). The read/write methods split a read-block or write-packet range in to several sub-ranges to simplify the complexity of the related read/write procedures and reduce the required capacity of DRAM buffer for the read/write procedures of the CD-MRW. The sub-ranges are continuous, partial, or defect ranges of packets or blocks.

Growing community of inventors

Hsinchu, Taiwan

Tse-Hong Wu