This part is a kind of semiconductor called ASM1456.

Function of this product has SATA 6G Mux/Demux Switch.

Manufacturers : ASMedia

Image and pinout :

Some of the text within the PDF file :

ASASTAM61GA4M5Su6xM/DDeeamdtuaixasShCweiotechnt fidential Copyright Notice: Copyright © 2008, ASMedia TECHNOLOGY INC. All Rights Reserved. INFORMATION IN THIS DOCUMENT IS PROVIDED IN CONNECTION WITH PRODUCTS OF ASMEDIA TECHNOLOGY INC. NO LICENSE, EXPRESS OR IMPLIED, BY ESTOPPEL OR OTHERWISE, TO ANY INTELLECTUAL PROPERTY RIGHTS IS GRANTED BY THIS DOCUMENT. EXCEPT AS PROVIDED IN ASMEDIA’S TERMS AND CONDITIONS OF SALE FOR SUCH PRODUCTS, ASMEDIA ASSUMES NO LIABILITY WHATSOEVER, AND ASMEDIA DISCLAIMS ANY EXPRESS OR IMPLIED WARRANTY, RELATING TO SALE AND/OR USE OF ASMEDIA PRODUCTS INCLUDING LIABILITY OR WARRANTIES RELATING TO FITNESS FOR A PARTICULAR PURPOSE, MERCHANTABILITY, OR INFRINGEMENT OF ANY PATENT, COPYRIGHT OR OTHER INTELLECTUAL PROPERTY RIGHT. Products of ASMEDIA TECHNOLOGY INC. ar [ ... ]

ASM1456 PDF Datasheet Download