This part is a kind of semiconductor called JMB380.

Function of this product has PCI Express to x1 Combo Memory Card and x1 1394a Host Controller.

Manufacturers : JMicron

Image and pinout :

Some of the text within the PDF file :

JMB380 JMB380 PCI Express to x1 Combo Memory Card and x1 1394a 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 Combo Memory Card Reader (SD/MMC/MS/xD) 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 Package Version On-board Application Add-on / Express Card Application SDXC UHS-1 D3E EEPROM Boot Function CR1_CD2 Co-layout --X X V X X V X V V X V* V V V X V X X --V X X V X X X X V X X X Co-layout X X V X X V X X V X V V V X X V V X X V V X V V V V X V X X X V V X X V [ ... ]

JMB380 PDF Datasheet Download