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STA015T Datasheet(PDF) 9 Page - STMicroelectronics |
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STA015T Datasheet(HTML) 9 Page - STMicroelectronics |
9 / 44 page 2.5 - STA015 Operation Mode The STA015 can work in two different modes, called Multimedia Mode and Broadcast Mode. In Multimedia Mode (default mode) STA015 de- codes the incoming bitstream, acting as a master of the data communication from the source to it- self. This control is done by a specific buffer manage- ment, controlled by STA015 embedded software. The data source, by monitoring the DATA_REQ line, send to STA015 the input data, when the signal is high (default configuration). The communication is stopped when the DATA_REQ line is low. In this mode the fractional part of the PLL is dis- abled and the audio clocks are generated at nominal rates. Fig. 7 describes the default DATA_REQ signal behaviour. Programming STA015 it is possible to invert the polarity of the DATA_REQ line (register REQ_POL). In Broadcast Mode, STA015 works receiving a bitstream with the input speed regulated by the source. In this configuration the source has to guarantee that the bitrate is equivalent to the nominal bitrate of the decoded stream. To compensate the difference between the nomi- nal and the real sampling rates, the STA015 em- bedded software controls the fractional PLL op- eration. Portable or Mobile applications need normally to operate in Broadcast Mode. In both modes the MPEG Synchronisation is automatic and transparent to the user. 2.6 - STA015 Decoding States There are three different decoder states: Idle, Init, and Decode. Commands to change the de- coding states are described in the STA015 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 registers of the device. The DAC connected to STA015 can be initialised dur- ing 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 SOURCE SEND DATA TO STA015 DATA_REQ SOURCE STOPS TRANSMITTING DATA SOURCE STOPS TRANSMITTING DATA D00AU1144 Figure 7. STA015-STA015B-STA015T 9/44 |
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