df_internal_release.txt

ATMEL 90usb128 USB source,include USB protocol stack.

ATMEL module internal release.
Date: February 10th 2006.



What: 
----
DataFlash driver for AT45DB321x and AT45DB642x DataFlash.
It consists of the following files: 
	(*) df.c, df.h: low level driver
	(*) df_mem.c, df_mem.h: scsi protocol adapter layer.


Limitations: 
-----------
(*) the DF driver is dedicated to communicate with a USB entity.
For instance, a write to DF always implies a read from the USB port, by using the USB_read_byte() function.
Another example: a read from DF implies a write towards the USB port, by using the Usb_write_byte() function.

(*) df_read_byte() and df_write_byte(): have not been yet used, and thus have not been tested and thus nor validated.

(*) The AT45DB642x DataFlash types have not been tested and thus nor validated.


Validation/tests: 
----------------
this module has been tested in the sub-directory valid.
The source code consists of a main.c file that does write/read/check actions.
The driver successfully passed all the tests.
Warning: the AT45DB642x DataFlash types have not been tested and thus nor validated,
because the board on which the tests were executed contained only two AT45DB321x DataFlash.

(*) Tests environment:
Chip: AT90usb128
Board: USB-KEY
CVS label: at90usb128-usbkey-valid-df-drv-0_0_1
CVS modules: at90usb128, common.


Required evolutions:
-------------------
(*) Make the module independant of USB.