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Moteur de recherche de fiches techniques de composants électroniques |
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Moteur de recherche de fiches techniques de composants électroniques |
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STA003T Fiches technique(PDF) 8 Page - STMicroelectronics |
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STA003T Fiches technique(HTML) 8 Page - STMicroelectronics |
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8 / 32 page  2.4 - PCM Output Interface The decoded audio data are output in serial PCM format. The interface consists of the following sig- nals: SDO PCM Serial Data Output SCKT PCM Serial Clock Output LRCLK Left/Right Channel Selection Clock The output samples precision is selectable from 16 to 24 bits/word, by setting the output precision (16, 18, 20 and 24 bits) with PCMCONF register. Data can be output either with the most signifi- cant bit first (MS) or least significant bit first (LS), selected by writing into a flag of the PCMCONF register. Figure 8 gives a description of the STA003T PCM Output Formats. The sample rates set decoded by STA003T is de- scribed in Table 1. LRCKT SDO SDO PCM_FORMAT = 0 PCM_DIFF = 0 PCM_FORMAT = 1 PCM_DIFF = 1 32 SCLK Cycles 32 SCLK Cycles 32 SCLK Cycles 32 SCLK Cycles 32 SCLK Cycles M S M S L S L S L S L S M S M S M S L S M S L S L S L S M S M S LRCKT SDO SDO PCM_ORD = 1 PCM_PREC is 16 bit mode PCM_ORD = 0 PCM_PREC is 16 bit mode 16 SCLK Cycles 16 SCLK Cycles 16 SCLK Cycles 16 SCLK Cycles 16 SCLK Cycles M S M S L S L S L S L S M S M S M S L S M S L S L S L S M S M S SDO PCM_FORMAT = 0 PCM_DIFF = 1 L S L S M S M S M S L S L S M S SDO PCM_FORMAT = 1 PCM_DIFF = 1 L S L S M S M S M S L S L S M S 0 0 0 0 0 0 0 0 00 00 0 0 0 0 MSB MSB MSB MSB Figure 8. PCM Output Formats Table 1: MPEG Sampling Rates (KHz) MPEG 1 MPEG 2 MPEG 2.5 48 24 12 32 16 8 2.5 - STA003T Decoding States There are three different decoder states: Idle, Init, and Decode. Commands to change the de- coding states are described in the STA003T I 2C registers description. Idle Mode In this mode the decoder is waiting for the RUN command. This mode should be used to initialise the configuration register of the device. The DAC connected to STA003T can be initialised during this mode (set MUTE to 1). PLAY MUTE Clock State PCM Output X 0 Not Running 0 X 1 Running 0 Init Mode "PLAY" and "MUTE" changes are ignored in this mode. The internal state of the decoder will be updated only when the decoder changes from the state "init" to the state "decode". The "init" phase ends when the first decoded samples are at the output stage of the device. Decode Mode This mode is completely described by the follow- ing table: PLAY MUTE Clock State PCM Output Decoding 0 0 Not Running 0 No 0 1 Running 0 No 1 0 Running Decoded Samples Yes 1 1 Running 0 Yes STA003T 8/32 |
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Description similaire - STA003T |
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