SM323

Description

The SM323 is a highly compatible, and best performance USB2.0 Flash Disk controller intended for supporting Dual-Channel SLC & MLC NAND type Flash memory in one chip.

For the power consumption consideration, the SM323 complies with USB power specification ver.2.0 for bus-powered devices. And for the USB2.0 Flash Disk application, the SM323 supports up to 8 data Flash banks, "Write Protect" security function, and PC boot up from USB2.0 Flash Disk.

The objective of the SM323 controller is to drastically increase the USB Flash memory data transfer rate as well as reduce the overall system cost by offering a manufacturing-ready turnkey solution to customers. The SM323 is available in 64-pin QFP package.

Figure 1: SM323 Block Diagram

Features

• Completes USB specification ver.2.0 compatibility
• Complies with USB Mass Storage Class specification ver.1.0
• Bulk Only transport protocol
• Complies with USB power specifications for bus-powered devices
• Operating system supported: Windows XP/2000/Me/98/98SE, Mac OS 9.X/X, Linux Kernel 2.4 and above.
• Master SPI (Serial Peripheral Interface) for flexible applications.
• Supports dual channel for Flash memory, averaged data transfer rate up to 25* MB/sec
• Compatible with NAND type Flash and up to 8 banks
• Supports MLC Flash with 4 bit ECC
• Supports VID, PID, serial number & vender information update
• Provides LED indicator when USB Flash Disk is in Ready/Working mode
• Supports "Write Protect" security function to protect data in UFD
• Supports suspend and wake-up resume
• Integrated 80C51 compatible 8-bit microprocessor with enhanced feature
  • Requiring just two clocks per machine cycle
• 12MHz crystal driver circuit
• Fabricated in 0.22um CMOS process
• 2.5 Volts low power core operation
• Operates on a single power supply (Vdd = 3.3V)
• Available in 64-pin QFP package
  *This figure may vary on different platform