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Renesas USB Device
10. Limitations
The following limitations apply to HMCD.
1. The program in this application note was created for the USB0-IP module.
Only areas where it is important to recognize the difference between USB0-IP and USB1-IP are noted in the task ID
definitions, etc.
(To handle the USB1-IP module, view all occurrences of "usb_" or "USB_" as "usb2_" or "USB2_" respectively.)
2. Structures are composed of members of different types. (Depending on the compiler, the address alignment of the
structure members may be shifted.)
3. When there is no response to a GetMaxUnit request for three seconds or more (the control transfer does not end), the
device is processed as a single-unit device.(for uITRON)
4. When connecting multiple storage devices, HMSCD must be registered the same number of times as the number of
connectable devices.
5. Additional limitations apply to HMSDD. See section 7 for details.
6. There is no guarantee that a storage device meeting the functional requirements listed in section 7 can be
successfully connected.
7. TFAT is supported only by one device. See TFAT instruction manual details.
R01AN0513EJ0110 Rev.1.10
Aug 10, 2011
USB Host Mass Storage Class Driver(HMSC)
Page 54 of 55
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