1. Support USB v2.0 specification and USB Device Class Definition for Mass Storage, - Transport v1.0 2. Supports SM/XD SD/MMC MS/MSPRO CF/MD specification Work with default driver from Windows ME, Windows XP, and Mac OS X. 3. Windows 98, Windows 2000 are supported by vendor AP (The AP included both win98 0and 2000 driver) from CENTIFLY. 4. Ping-pong FIFO implementation for concurrent bus operation . 5. Support multiple sectors transfer optimize performance. 6. Support slot-to-slot read/write operation. 7. Support auto-detecting slot with card ed on Win 2000 without driver. 8. Capable of handing 4 sets of built-in PID, VID and strings to minimize inventory control and improve lead production lead-time. 9. Support LED for bus activity indication. 10. Each slot can be enables/disabled by 5 independent pins to fit all the different card readers combination requirement. 11. Runs at 30MHz, built-in 480 MHz PLL. 12. Built-in 3.3V to 2.5V regulator .