Information Technology Reference
In-Depth Information
READ CAPACITY
The LOGICAL BLOCK ADDRESS field contains an incorrect value (the
correct value + 1) because the device is reporting the number of sectors
rather than the LBA of the highest sector.
REQUEST SENSE
In devices with removable media, when the media changes, the device
doesn't set the SENSE KEY to 06h (UNIT ATTENTION) to indicate the
change (required by SBC-2 and SBC-3).
START STOP UNIT
On receiving the command, the device crashes.
WRITE
The device doesn't implement all mandatory versions of the command.
Writable devices that comply with SBC-2 or SBC-3 should implement both
WRITE(6) and WRITE(10).
Host Options
PCs and other desktop computers are USB hosts that have drivers for com-
municating with mass-storage devices. Several vendors offer USB host-con-
troller chips for use in embedded systems. Just about any of these chips is
suitable for use in a mass-storage host. Many can function as a conventional
host or as an OTG device. To speed up project developing, look for a devel-
opment kit with mass-storage support or use an embedded operating system
that has a mass-storage driver included or available from a third party.
Cypress EZ-HOST
Cypress Semiconductor offers the CY4640 Mass Storage Reference Design
Kit for the CY7C67300 EZ-Host microcontroller.
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