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NJU26123 Datasheet(PDF) 7 Page - New Japan Radio |
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NJU26123 Datasheet(HTML) 7 Page - New Japan Radio |
7 / 17 page NJU26100 Series - 7 - Ver.2005-02-24 4. Audio Interface The serial audio interface carries audio data to and from the NJU26100 Series. Industry standard serial data formats of I2S, MSB-first left-justified or MSB-first right-justified are supported. These serial audio formats define a pair of digital audio signals (stereo audio) on each data line. Two clock lines, BCK (bit clock) and LR (left/right word clock) establish timing for serial data transfers. The NJU26100 Series serial audio interface includes three data input lines, SDI0, SDI1 and SDI2, and three data output lines, SDO0, SDO1 and SDO2, as shown in the figure below. The input serial data is selected by the firmaware command. The number of these serial audio interfaces depends on the DSP function. Check the each data sheet. The NJU26100 Series has a pair of left/right clock lines (LRI and LRO) and a pair of bit clock lines (BCKI and BCKO). Clock inputs BCKI and LRI are used to accept timing signals from an external device when the NJU26100 Series is operating in SLAVE clock mode. The BCKO, LRO and MCK, system clock output, are provided for delta-sigma A/D and D/A converters when the NJU26100 Series operates in MASTER mode. In SLAVE mode, the output of BCKO and LRO are the buffered output of BCKI and LRI. The output of MCK is fixed to Low level in SLAVE mode. NJU26100 BCKO LRO MCK BCKI LRI Serial Data Outputs Serial Clock Outputs Serial Clock Inputs Serial Data Inputs System clock for A/D, D/A converters (DSP MASTER mode only) SDO0 SDO1 SDO2 SDI0 SDI1 SDI2 Fig. 4-1 Serial Audio Interface 4.1 Audio Data Format The NJU26100 Series can exchange data using any of three industry-standard digital audio data formats: I2S, MSB-first Left-justified, or MSB-first Right-justified. The three serial formats differ primarily in the placement of the audio data word relative to the LR clock. Left-justified format places the most-significant data bit (MSB) as the first bit after an LR transition. I2S format places the most-significant data bit (MSB) as the second bit after an LR transition (one bit delay relative to left-justified format). Right-justified format places the least-significant data bit (LSB) as the last bit before an LR transition. Clock LR (LRI, LRO) marks data word boundaries and clock BCK (BCKI, BCKO) clocks the transfer of serial data bits. One period of LR defines a complete stereo audio sample and thus the rate of LR equals the audio sample rate (Fs). All formats transmit the stereo sample left channel first. Note that polarity of LR is opposite in I2S format (LR:LOW = Left channel data) compared to Left-Justified or Right-Justified formats. |
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