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GS2970A Datasheet(PDF) 81 Page - Semtech Corporation |
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GS2970A Datasheet(HTML) 81 Page - Semtech Corporation |
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81 / 150 page  GS2970A 3Gb/s, HD, SD SDI Receiver Data Sheet 54244 - 2 September 2012 81 of 150 1. Assert the B to A converter reset by writing '1' to bit 3 of register 05Eh. 2. Monitor H-pulse for a high-to-low transition. 3. De-assert the B to A converter reset by writing '0' to bit 3 of register 05Eh. This must be completed at the beginning of SAV and should be completed in 1920 PCLK periods. 4.19 Audio De-embedder The GS2970A includes an integrated audio de-embedder which is enabled by default in SMPTE mode. It can be disabled by setting the AUDIO_EN/DIS pin LOW, or by setting the host interface AUD_EXT_MASK bit to HIGH, or by keeping IOPROC_EN/DIS pin LOW. In non-SMPTE modes, the audio de-embedder is not active. Up to eight channels of audio may be extracted from the received serial digital video stream. The output signal formats supported by the device include AES/EBU, I2S (default) and industry standard serial digital formats. 16, 20 and 24-bit audio bit depths are supported for 48kHz synchronous audio for SD data rates. For HD and 3G data rates, 16, 20 and 24-bit audio bit depths are supported for 48kHz audio. The audio may be synchronous or asynchronous to the video. In 3G mode: • In Level A mode, all Audio Control Packets are extracted from Data Stream One and all Audio Data Packets are extracted from Data Stream Two, in accordance with SMPTE 425M. This is similar to HD, in which Audio Control Packets are embedded in the Luma channel and audio data packets in the Chroma channel • In Level B mode, extraction of audio packets from Link A (default) or Link B is selectable via the AUDIO_SEL_DS2_DS1 bit in the host interface Additional audio processing features include audio mute on loss of lock, de-embed and delete, group selection, audio output re-mapping, ECC error detection and correction (HD/3G modes only), and audio channel status extraction. 4.19.1 Serial Audio Data I/O Signals The Serial Audio Data I/O pins are listed in Table 4-16: Serial Audio Pin Descriptions. Table 4-16:Serial Audio Pin Descriptions Audio Pin Name Description AUDIO_EN/DIS Enable Input for Audio Processing AOUT_1/2 Serial Audio output; Channels 1 and 2 AOUT_3/4 Serial Audio output; Channels 3 and 4 AOUT_5/6Serial Audio Output; Channels 5 and 6 AOUT_7/8 Serial Audio Output; Channels 7 and 8 ACLK 64fs clock |
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