BU94501AMUV Datasheet, PDF (44/73 Pages) Rohm – AAC/WMA/MP3 +SD Memory Card + iPod

BU9450xAxxx series
Datasheet
SET_TAG
SET_TOC
SET_PRM
BROWSING
ANALYZE_ROOT
PLAY_CURSOR
GET_TAG_CURSOR
A setup of the repeat in the memory is followed when FF and FB command.
N=0x04: RANDOM_ALL: Random within the memory
Plays tunes at random starting from the one being played, in a range 128 tunes
ahead and back of the tune.
N=0x05: RANDOM_FOL: Random within the folder
Plays tunes at random within the folder starting from the one being played,
in a range 128 tunes ahead and back of the tune.
・By default, N=0x00 is set.
・For the settings of the REPEAT, RANDOM and SET_REPRAND commands,
the one finally set becomes enabled.
4 0x61 0x10 0x05 N ・This command sets TAG analysis mode.
・Select N at the 4^th byte from the following. Any settings other than N=0x00
will be considered to specify N=0x01.
N=0x00: Does not perform TAG analysis.
N=0x01: Performs TAG analysis.
・TAG analysis is performed immediately before the LSI starts playing a tune,
and started from the file to be searched after the setting is enabled.
・After TAG analysis is completed, the LSI writes the result to the status register.
・By default, N=0x01: "Performs TAG analysis" is set.
4 0x61 0x10 0x06 N ・This command sets TOC analysis mode.
・Select N at the 4^th byte from the following. Any setting other than N=0x00 will
be considered to specify N=0x01.
N=0x00: Does not perform TOC analysis.
N=0x01: Performs TOC analysis.
・When receiving the command, inserting or changing the device, the LSI
analyzes the total number of folders within the device (all the folders including
root folders) and the total number of playable files. When receiving a
command, TOC analysis is performed only at change from OFF to ON.
・The total number of files conforms to the SEL_MP3, SET_WMA, SET_AAC,
SET_WAV, SET_MP3_PLAY command.
・The total number of folders conforms to the SET_EMP_DIR command.
・After TOC analysis is completed, the LSI writes the number of total folder and
total playable file to the status register, and stops at the first tune in the device.
・By default, N=0x00: "Does not perform TOC analysis" is set.
8 0x61 0x10 0x07 L
・This command sets play time (M) and skip time (N) for fast forward and rewind.
・Play time is a period of time to make sound. Skip time is a period of time to
skip during search.
・For fast forward and rewind, a cycle of {play time (M) + skip time (N) + error
(O)} is repeated.
The error is determined by the difference between the minimum decode unit
and the rounding error between the play time and the real time requiring to
search the skip time. The error varies depending on the file and memory
structure.
・Play time is set to M[15:0]= [6th byte, 5th byte], and skip time to N[15:0]= [8th
byte, 7th byte].
The unit is msec. By default, play time is 300ms=M[15:0]= [6th byte=x01,5^th
byte=x2C], and skip time is 2100ms=N[15:0]= [8th byte=x08,7th byte=x34].
Specifying 0x0 sets the default.
Set play time to 300ms or more, and skip time to (play time×16) or less.
When it is moved by the fast rewind play in the front to the tune,
the regenerated time of the first period may become shorter than setup time.
・0xL in the 4^th byte sets the attenuation level during fast forward and rewind.
The allowable level is -6dB X[4th byte].
Allowable setting range is from 0x00 to 0x10.
By default, 0x02=-12dB is set. Setting of 0x10 is equivalent to MUTE.
4 0x62 0x00 0x00 0ｘ00 ・The LSI starts analyzing the root folder immediately after receiving the
command.
・The analysis is performed for the information of 10 entries (files or subfolders)
・Upon completion of analysis, the cursor position for browsing within the
memory is set to the first entry (file or subfolder) within the root folder.
4 0x62 0x01 0x00 0x00 ・This command selects the file being pointed by the memory browsing cursor.
・If a playable file is selected, the LSI starts playing it.
・If a folder or unplayable file is selected, this command will not be accepted.
・Don't use PLAY_CURSOR in the PLAYER mode when use SET_EXTENSION
command by the setup except for N=0x00 (Playable file).
Get access data of present cursor position by READ_BROWSE_ENTRY_INFO
command, and start play by PLAY_DIRECT command.
4 0x62 0x01 0x01 0x00 ・This command performs TAG analysis for the file being pointed by the memory
browsing cursor.
・When a file is pointed by the memory browsing cursor, the LSI immediately
starts TAG analysis through the file. Upon completion of analysis, the LSI
writes the result to the status register.
・When a folder is pointed by the memory browsing cursor, this command will
not be accepted.
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TSZ22111・15・001
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TSZ02201-0V2V0E600070-1-2
2012.12.10 Rev.003