This part is a kind of semiconductor called JM20330.

Function of this product has Serial ATA Bridge Chip.

Manufacturers : JMicron

Image and pinout :

Some of the text within the PDF file :

JM20330 Serial ATA Bridge Chip JMicron/JM20330 Description JMicron’s JM20330 is a single chip solution for serial and parallel ATA translation. It includes the Serial ATA PHY, Link, Transport, and Parallel ATA (application layer) controller. The Serial ATA physical, link, and transport layers are compliant to Serial ATA 1.0a. JM20330 supports 1.5GHz data rate. The application layer supports both the ATA register command set and PACKET command set, which could drive both Hard Disk Drive and ATAPI Optical Storage such as CR-ROM, CD-RW, DVD-ROM, DVD-RW, etc. The Serial ATA and the Parallel ATA application layer support both host and device operation and can be configured through a single pin. Features • Serial ATA 1.0a Specification compliant • ATA/ATAPI PIO mode 0 to 4 • ATA/AT [ ... ]

JM20330 PDF Datasheet Download