Design And Implementation On Main Controller Of Network Attached Optical Disc Jukebox

As the rapid development of society, science and technology, high demand of date volume experienced an explosive growth as well as of mass storage. Optical Disc Jukebox, in the hierarchical massive storage, as the secondary mass storage equipment, used primarily for data backup and archiving. In the past, the main controller of Optical Disc Jukebox, drive and the server were connected to SCSI bus, and the main controller controlled the drives by sending SCSI commands. A series of requirements and challenges of Optical Disc Jukebox has been stressed, for the interface of the Blu-ray drives and mainstream drivers is SATA. Especially, because of leaping of Blu-ray technology and unification of its standard.This paper, combined with the latest technical, was written by reviewing related documents, understanding Optical Disc Jukebox system's control theory and function modules, primarily redesigned the modules of Optical Disc Jukebox. The main controller is at the core of embedded microprocessor S3C2440 based on ARM920T architecture. With built-in LCD controller, touch-screen interface and NAND controller, the system simplified hardware circuit design and shorted products development cycles. By porting embedded Linux operating system, it could improve development efficiency; develop applications with strong compatibility, at the meantime, lower maintenance costs. The system adopted embedded database (SQLite3) through transplantation to manage data. The system could read the RFID from the magazines by RFID reader module to identify each unique magazine. When the magazine had been removed, system stored the data in the embedded database; when the magazine had been moved in, it could get all the information of the magazine by querying the database. In that way, it had no need to mechanical scan, and time saving. Separating the drive's data channel and control channel then connected control signal and sensor signal to the motor board. The main controller could achieve the purpose of controlling the drive by sending commands to the motor board. Even if the drive's interface upgraded, it has no need to modify the master system's interface. In this system, we use Blu-ray disc drive with SATA interface connected to the SAS bus.To be proved, the main control system fully meets requirements, which means high reliability, low cost and strong features.