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STA013B Datasheet(PDF) 9 Page - STMicroelectronics |
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STA013B Datasheet(HTML) 9 Page - STMicroelectronics |
9 / 38 page 2.5 - STA013 Operation Mode The STA013 can work in two different modes, called Multimedia Mode and Broadcast Mode. In Multimedia Mode, STA013 decodes the in- coming bitstream, acting as a master of the data communication from the source to itself. This control is done by a specific buffer manage- ment, controlled by STA013 embedded software. The data source, by monitoring the DATA_REQ line, send to STA013 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. 9 describes the default DATA_REQ signal behaviour. Programming STA013 it is possible to invert the polarity of the DATA_REQ line (register REQ_POL). In Broadcast Mode, STA013 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 STA013 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. To operate in Multi- media mode, the STA013, pin nr. 8, SCR-INT must be connected to VDD on the application board. 2.6 - STA013 Decoding States There are three different decoder states: Idle, Init, and Decode. Commands to change the de- coding states are described in the STA013 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 STA013 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 3 - I 2C BUS SPECIFICATION The STA013 supports the I 2C protocol. This pro- tocol defines any device that sends data on to the bus as a transmitter and any device that reads the data as a receiver. The device that controls the data transfer is known as the master and the others as the slave. The master always starts the transfer and provides the serial clock for synchro- nisation. The STA013 is always a slave device in all its communications. 3. 1 - COMMUNICATION PROTOCOL 3.1.0 - Data transition or change Data changes on the SDA line must only occur when the SCL clock is low. SDA transition while the clock is high are used to identify START or STOP condition. 3.1.1 - Start condition START is identified by a high to low transition of the data bus SDA signal while the clock signal SCL is stable in the high state. A START condition must precede any command for data transfer. SOURCE SEND DATA TO STA013 DATA_REQ SOURCE STOPS TRANSMITTING DATA SOURCE STOPS TRANSMITTING DATA D98AU913 Figure 9. STA013 - STA013B - STA013T 9/38 |
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