ASE Receives Supplier of the Year Award from Vitesse Semiconductor.

SANTA CLARA, Calif. -- Advanced Semiconductor Engineering Incorporated (ASE)(TAIEX:2311)(NYSE:ASX), the world's largest semiconductor packaging and test company, announced today that it has received a 2004 Supplier of the Year award from Vitesse Semiconductor Corp. (NASDAQ:VTSS). ASE was selected for demonstrating exceptional quality, service, and delivery in its contribution to Vitesse's packaging and test solutions.

Each year Vitesse presents performance awards to outstanding vendors. Recipients of the 2004 Supplier Excellence Awards were chosen using a Supplier and Subcontractor Rating Procedure that ranked Quality, Flexibility, Cost of Doing Business, Customer Service and Strategic Advantage. ASE was the sole semiconductor assembly and test company rated Above Average or Outstanding in each category.

ASE has offered Vitesse cost competitive packaging technology and assembly services to help grow their Ethernet and Storage business, and has been instrumental in providing Vitesse dedicated service in key areas such as technology and factory support, particularly in relation to their thermally enhanced BGA, Flip Chip, Lead Free, and Wafer Level CSP program developments.

"ASE is honored to be recognized by a valued customer in this way. Recent years have seen significant developments in the semiconductor market that have substantially changed the competitive landscape. While we respond rapidly to this dynamic and changing marketplace, we consistently remain true to our core philosophy of focusing on the needs of our key customers and providing top quality service," said Dr Tien Wu, President of ASE Americas, Europe, ASE (U.S.) Inc. "This award is a testament to our strategy, and we will continue to successfully blend our superior technologies with a flexible, responsive organization focused on meeting customer requirements."

About Vitesse

Vitesse designs, develops, and markets a diverse portfolio of high-performance, cost-competitive semiconductor solutions for communications and storage networks worldwide. Engineering excellence and dedicated customer service distinguish Vitesse as an industry leader in Gigabit Ethernet LAN, Ethernet-over-SONET, Advanced Switching, Fibre Channel, Serial Attached SCSI, Optical Transport, and other applications. Vitesse innovation empowers customers to deliver superior products for Enterprise, Access, Metro, and Core applications. Additional company and product information is available at www.vitesse.com.

About ASE Group

The ASE Group is the world's largest provider of independent semiconductor manufacturing services in assembly and test. As a global leader geared towards meeting the industry's ever growing needs for faster, smaller and higher performance chips, the Group develops and offers a wide portfolio of technology and solutions including IC test program design, front-end engineering test, wafer probe, wafer bump, substrate design and supply, wafer level package, flip chip, system-in-package, final test and electronic manufacturing services through Universal Scientific Industrial Co Ltd, a member of the ASE Group. The Group generated sales revenues of $2.45 billion in 2004 and employs over 30,000 people worldwide. For more information about the ASE Group, visit www.aseglobal.com.