BU94605AKV Datasheet, PDF (35/84 Pages) Rohm – AAC/WMA/MP3 +SD Memory Card +CD-ROM+MP3 Record

BU94605AKV BU94607AKV BU94702AKV BU94705AKV
Datasheet
14.4 Folder/File sort
The LSI sorts the sub-folders and files in the following sequence:
[1] Obtain up to 100 sub-folders and files each in the order written to FAT within selected folder.
[2] Compare the obtained folder/file names for 14 characters (28 bytes) from the beginning in UNICODE (2-byte
character) and sort them in the ascending order. *
[3] If there are files/folders with same character strings: follow the order of MP3, WMA, AAC and WAV when the
extension is different; and, otherwise, follow the order written to FAT.
[4] 101 or more files or sub-folders follow the order written to FAT.
* The processing of the file name and the folder name is shown in the following.
1) When a LFN (long file name) entry exists, 2 bytes are treated as one character.
2) When no LFN entry exists, the SFN (short file name) entry is processed as follows.
2-a) When the first appeared character code is within the range of 0x00-0x7F (US-ASCII), the LSI treats one byte
as one character, and adds '0x00' to the upper of the character to expand the entire character to an
UNICODE.
2-b) For a case other than 2-a), practically, the LSI treats these 2 bytes as one character.
*For details on LFN and SFN, see the FAT file system specifications.
[Root
Folder]
A.mp3
B.mp3
C.mp3
A_FOLDER
D.mp3
E.mp3
F.mp3
G.mp3
H.mp3
B_FODER
I.mp3
J.mp3
C_FOLDER
K.mp3
L.mp3
M.mp3
N.mp3
O.doc
P.xls
Q.mp3
R.txt
D_FOLDER S.txt
T.txt
E_FOLDER
U.mp3
V.mp3
W.mp3
X.mp3
Y.mp3
Z.mp3
Figure 35. Example of Folder/File Structure within the Memory Device
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TSZ02201-0V2V0E600090-1-2
2012.12.10 Rev.002