This part is a kind of semiconductor called JMB380.

Function of this product has PCI Express to 1394a OHCI and Memory Card Host Controller.

Manufacturers : JMicron

Image and pinout :

Some of the text within the PDF file :

JMB38X JMB38X Product Family PCI Express to 1394a OHCI and Memory Card Host Controller Overview JMB38X is product family that includes 1394a OHCI and Memory Card Reader Host Controller. They are all 1-lane PCI Express to 1/2-port 1394a and 1-slot SD/MMC/MS/xD Memory Card Reader Host Controller. The table below shows the brief feature lists of JMB38X product family. JMB380 Host IF 1394a IF Card Reader PCIe x1 Port x1 Combo JMB388 PCIe x1 Port x1 Combo JMB381 PCIe x2 Port None JMB385 PCIe None x1 Combo LQFP48 JMB387 PCIe None x1 Combo JMB389 PCIe None x1 Combo Package Boot Function Version On-board application Add-on/ExpressC ard application SDXC UHS-1 D3E EEPROM SPI(Boot) CR1_CD2 Co-layout QFN48 None -C QFN48 Support* A B LQFP48 None -www.DataSheet.co.kr /QFN48 None LQFP48 Supp [ ... ]

JMB380 PDF Datasheet Download