ST72682 STMicroelectronics, ST72682 Datasheet - Page 16

• Manufacturer Part Number: ST72682
• Description: USB 2.0 high-speed Flash drive controller
• Manufacturer: STMicroelectronics

Mass storage implementation
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Mass storage implementation
USB characteristics
The ST72682 is compliant with USB 2.0 specification.
It is able to operate in both high speed and full speed modes using a bidirectional control
endpoint 0 and a bidirectional bulk endpoint 2.
It automatically recognizes the speed to use on the bus by a process of negotiation with
USB Host.
BOT/SCSI implementation
BOT specification
The USB Mass Storage Class Bulk Only Transport (BOT) specification version 1.0 is
implemented. It allows the device to be recognized by the host as a mass-storage USB
device.
SCSI specification
Moreover, inside BOT transfers, SCSI commands are encapsulated for mass storage
operations.
The related specifications are SBC-2 revision 10 (SCSI Block Commands 2) and SPC-4
revision 7a (SCSI Primary Commands 4).
Bootability specification
The USB mass storage specification for bootability revision 1.0 is implemented.
It allows the PC host to boot the operating system from the USB mass storage application.
In this case, the Host uses BOT LUN 0 (logical unit number).
A specific tool must be used to format the logical drive in order to make it bootable by
programming the correct information.
Multi-LUN device characteristics
The application can be configured with a dedicated PC software tool as a multi-LUN device.
In this case, up to 3 different drives are available: public drive, additional drive and private
drive.
Public and additional drives can be configured as removable drive, hard disk drive or CD-
ROM drive.
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