USB97CFDC

 3.3 Volt, Low Power Operation
 Complete USB Specification 1.1 Compatibility
   - Includes USB Transceiver
   - Based on an Enhanced Version of SMSC's Industry Proven USB97C100 USB Controller
 Complete System Solution Including USB Mass Storage Class Compliant Win98/2000 Driver and Firmware
   - Supports 640K, 720K, 1.44M, 1.2M Windows 98J, and 1.2M NEC DOS 6.x Formats
   - Supports Both the UFI and SFF8070i Command Sets
   - Supports USB Mass Storage Compliant Bootable Floppy BIOS
   - 4ms Seek Times
   - USB 1.1 Compliance, Including Low Power Device Class SUSPEND Mode Operation and Power Control of Disk Drive
   - Disk Drive Feedback of Readiness Upon Power Re-Application Option
   - Option for Ultra High Performance Using Additional Caching SRAM
   - Support for Floppy Drive Power Control
 Contains SMSC's Industry Proven Floppy Disk Controller
   - Licensed CMOS 765B Floppy Disk Controller
   - Supports Single Normal or Three Mode Floppy Drives 
   - Supports Vertical Recording Format and High Capacity Drives in User Written Firmware Applications
   - Detects All Overrun and Underrun Conditions
   - Sophisticated Power Control Circuitry (PCC) Including Multiple Powerdown Modes for Reduced Power Consumption
 Enhanced Digital Data Separator
   - 1 Mbps, 500 Kbps, 300 Kbps, 250 Kbps Data Rates
   - Programmable Precompensation Modes
 Intelligent Auto Power Management
   - <300A SUSPEND Current
   - <75mA Operating Current
 External Program Memory Interface
   - 32K Byte Code Space (Supplied Firmware Requires 16KB Memory)
   - Flash, SRAM, or EPROM Memory
 4KB Internal Buffer SRAM for High Performance Operation
 Optional External Cache Memory
   - Up to 16K x 8 External SRAM may be Used for Custom Tape/ Drive Applications
 Integrated 14.318 MHz Crystal Driver Circuit
 100 pin TQFP package (12.0 x 12.0 mm footprint)
   - 25% smaller body size than other 100 pin TQFP packages

The USB97CFDC is an integration of the USB97C102 Enhanced Multi-Endpoint USB Peripheral Controller, without its integrated hub functions, and the SMSC Floppy Disk Controller used in many of its Super IO products, such as the USB97CFDC. Special care in the interconnection of the two devices has been taken to assure the lowest possible system current draw (<300A) during SUSPEND mode operation.

Provisions for external Flash Memory up to 32K bytes for program storage is provided.

Although not required for standard floppy operation, provisions for 16K bytes of external buffer SRAM, in addition to that included in the USB97CFDC core, is also provided for extended applications, such as tape drives and for other special applications.

Several pins are provided for controlling external power control elements and sensing specialized drive functions.

Note: SMSC has developed and supplies firmware and drivers for this device to implement a standard three mode or dual mode Floppy Disk Drive system with drive power control. If the customer desires to develop his own firmware and/or drivers for this system, he may contact SMSC to obtain a complete engineering specification which details all the internal block functions and register maps of the USB97CFDC to allow custom programs to be written for this device.