PT8401 Datasheet, PDF (6/28 Pages) Princeton Technology Corp – MP3 Audio Decoder

Princeton Technology Corp.
MP3 Audio Decoder
Tel : [phone]
Fax: [phone]
URL: http://www.princeton.com.tw
PT8401
ADPCM Decoding Mode : Same as MP3 Decoding Mode, except that the commands SetMode and
AdpcmMode have to be set to ADPCM Decoding Mode.
The basic operation modes of PT8401 are Stop and Play. After all the necessary commands are set properly
(like SP_SEL , PLL setting etc.), PT8401 will enter decoding/encoding process by issuing a Play command
at address 0x40 through I²C interface.
Besides, the MP3 decoding, PT8401 offers two additional modes, namely: Pause and Fast Forward . The
Pause Mode will stop MP3 decoding, wait for the PLAY command set to the other mode. If PLAY=0x01
is issued, PT8401 will resume playing from the broken point. The Fast Forward Mode is achieved with the
help of command Fward_Num(number of frame to play) and Skip_Num(number of frame to skip.
Serial Audio Interface
SERIAL OUTPUT INTERFACE
In the serial audio output interface, following signals are generated:
MCLK : Master Clock, configured as 256fs or 384fs according to Mclk Sel command.
ADQO: Serial Data Output
ACKQO: Bit Clock Output, derived from MCLK
ALRQO: Left/Right Channel Word Selection
ACKQO
ADQO 15 14 13 12 11 4 3 2 1 0
ALRQO
Left Channel
15 14 13 12 11 4 3 2 1 0
15
Right Channel
Figure 4: Serial Audio Output Timing
PT8401 v 1.3
Page 6
Updated March 2002