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GS2970A Datasheet(PDF) 91 Page - Semtech Corporation |
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GS2970A Datasheet(HTML) 91 Page - Semtech Corporation |
91 / 150 page ![]() GS2970A 3Gb/s, HD, SD SDI Receiver Data Sheet 54244 - 2 September 2012 91 of 150 once every frame. If one of the groups currently de-embedded disappears and re-appears, clear the audio FIFO after the group re-appears. Clear the audio FIFO by asserting CLEAR_AUDIO and de-asserting at least one frame later. When the FIFOs are in the clear state, audio will be muted but audio clocks will continue to run. When switching between 525 and 625 formats, it is recommended that the device be reset to keep the delays through the audio FIFO the same between channels. 4.19.3.4 Audio Crosspoint Block The Audio Crosspoint is used for audio output channel re-mapping. This feature allows any of the selected audio channels in Group A or Group B to be output on any of the eight output channels. The default setting is for one to one mapping, where AOUT_1/2 is extracted from Group A CH1 and CH2, AOUT_3/4 is extracted from Group A CH3 and CH4, and so on. NOTE: If audio samples from embedded audio packets with the group set in IDA[1:0] are to be paired with samples from the group set in IDB[1:0], all of the channels must have been derived from the same Word Clock and must be synchronous. The output channel is set in the OPn_SRC[2:0] host interface registers. Table 4-22 lists the 3-bit address for audio channel mapping. 4.19.3.5 Serial Audio Output Word Length The audio output, in serial modes, has a selectable 24, 20 or 16-bit sample word length. The ASWL[1:0] host interface register is used to configure the audio output sample word length. Figure 4-23 shows the host interface 2-bit code for setting the audio sample word length. When the presence of extended audio packets is detected in SD modes, the audio de-embedder defaults to 24-bit audio sample word length. Table 4-22:Audio Channel Mapping Codes Audio Output Channel 3-bit Host Interface Source Address 1000 2001 3010 4011 5100 6 101 7110 8111 |
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