SN20086

2004/9/2

ver 0.2

2

1 General Description

SN20086 is a high-performance integrated circuit to access the NAND type Flash memory

via the 480 MHz USB 2.0 bus. It provides a flexible and cost efficient single chip solution

for external storage applications such as USB Disk (Flash Disk). With all the features

inherited from the popular SN11085/86/88, the users can easily upgrade to SN20086 and

enjoy the tremendous speed increment.

Although the USB speed is increased 40 times from 12 M to 480 M, the external crystal

frequency of SN20086 is still kept at 6MHz, keeping the EMI at low level. The functions that

ensure the data integrity like the embedded translation table, the Sonix proprietary

randomization algorithm, and the real time ECC correction function are all the implemented

as the USB 1.1 version. SN20086 also incorporates Sonix in-house algorithm to improve the

performance of the flash disk.

To enrich the product line of the OEM manufacture and reduce the effort of component

sourcing, SN20086 supports both single channel and dual channel modes in a single chip. In

addition, SN20086 supports NAND flash memories of Samaung, Toshiba, Hynix,

STMicroelectronics and Micron, providing more flexibility for the flash memory’s

purchasing.

With the ability to support 8 pieces of flash memories and the new types of 2G, 4G, and 8G

bits flashes, SN20086 can be used to build up a storage device up to 8 Giga bytes large.

The USB Mass Storage Class compliance capability of SN20086 makes it a truly

“plug-and-play” device without vendor drivers under Windows 2000/ME/XP, Mac OS

8.6/9/10, and Linux. SN20086 also provides PC boot up function as a USB floppy disk

(1.44M), USB ZIP, USBB HDD or USB CD-ROM, which makes it an ideal replacement for

the legacy floppy disk.