PT8401 Datasheet, PDF (12/28 Pages) Princeton Technology Corp – MP3 Audio Decoder

Princeton Technology Corp.
Tel : [phone]
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URL: http://www.princeton.com.tw
MP3 Audio Decoder
PT8401
GPIO PINS DURING MPEG DECODING
GPIO Name
0 MPEG ID
1 Layer Info
3,2 Sampling
Frequency
4 FRAME
SYNC_INFO
5 CRC ERROR
6 Half_second
15 Demand Signal
Description
“0” : MPEG2
“1” : MPEG1
“0” : Layer III.
“1” : Layer I or Layer II.
“00” : 44.1/22.05 kHz
“01” : 48/24 kHz
“10” : 32/16 kHz
“11” : reserved.
An indicator for frame sync information. The period between two sync info
is less than 72 ms. The controller can treat this pin as a new frame is
decoded or if decoder is dead. Or every time this pin go high, new ancillary
is update and can be download via I²C interface.
“0” : no error.
“1” : CRC_error or bitstream error.
Half second indicator. The period between two high signal is half second
(No effect during parallel mode).
“0”: no request.
“1”: Ask for bitstream input.
GPIO PINS DURING ADPCM ENCODING
GPIO
0
1
2
3
4
Name
Enc_Dat[0]
Enc_Dat[1]
Enc_Dat[2]
Enc_Dat[3]
Enc_ENA
Description
LSB, 4-bit data during ADPCM Encoding.
MSB
"0" : Disable Encoded Data Output
"1" : Enable Encoded Data Output
PT8401 v 1.3
Page 12
Updated March 2002