PT8401 datasheet(12/28 Pages) PTC

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MP3 Audio Decoder

PT8401

PT8401 v 1.3

Page 12

Updated March 2002

Princeton Technology Corp.

GPIO PINS DURING MPEG DECODING

GPIO Name

Description

MPEG ID

“0” : MPEG2

“1” : MPEG1

Layer Info

“0” : Layer III.

“1” : Layer I or Layer II.

3,2

Sampling

Frequency

“00” : 44.1/22.05 kHz

“01” : 48/24 kHz

“10” : 32/16 kHz

“11” : reserved.

FRAME

SYNC_INFO

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 I

2C interface.

CRC ERROR

“0” : no error.

“1” : CRC_error or bitstream error.

Half_second

Half second indicator. The period between two high signal is half second

Demand Signal

(No effect during parallel mode).

“0”: no request.

“1”: Ask for bitstream input.

GPIO PINS DURING ADPCM ENCODING

GPIO

Name

Description

Enc_Dat[0]

LSB, 4-bit data during ADPCM Encoding.

Enc_Dat[1]

Enc_Dat[2]

Enc_Dat[3]

MSB

Enc_ENA

"0" : Disable Encoded Data Output

"1" : Enable Encoded Data Output

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