UM0290 datasheet(31/76 Pages) STMICROELECTRONICS

31 / 76 page

UM0290

Device firmware upgrade

31/76

Another example, for STR91x Flash microcontroller, is shown below:

"@Internal Flash 0 /0x00000000/8*064Kg" in case of the STR9 512KB

"@Internal Flash 0 /0x00000000/32*064Kg" in case of the STR9 2MB

Each Alternate setting string descriptor must follow this memory mapping else the PC Host

Software would be able to decode the right mapping for the selected device:

–

@: To detect that this is a special mapping descriptor (to avoid decoding standard

descriptor)

–

/: for separator between zones

–

Maximum 8 digits per address starting by “0x”

–

/: for separator between zones

–

Maximum of 2 digits for the number of sectors

–

: For separator between number of sectors and sector size

–

Maximum 3 digits for sector size between 0 and 999

–

1 digit for the sector size multiplier. Valid entries are: B (byte), K (Kilo), M (Mega)

–

1 digit for the sector type as follows:

a (0x41): Readable

b (0x42): Erasable

c (0x43): Readable and Erasable

d (0x44): Writeable

e (0x45): Readable and Writeable

f (0x46): Erasable and Writeable

g (0x47): Readable, Erasable and Writeable

Note:

If the target memory is not contiguous, the user can add the new sectors to be decoded just

after a slash"/" as shown in the following example:

"@Flash /0xF000/1*4Ka/0xE000/1*4Kg/0x8000/2*24Kg"

UM0290 Datasheet(PDF) 31 Page - STMicroelectronics