CM6206 Datasheet, PDF (23/35 Pages) C-Media Electronics – High Integrated USB Audio I/O Controller

CM6206
High Integrated USB Audio I/O Controller
6.4 Audio Interface Format In Codec Mode
In codec mode, audio data is applied to the internal DAC filters or output from ADC filters, via the Digital
Audio Interface. 2 popular interface formats are supported: Left Justified mode and I²S mode. Both
formats send the MSB first and note that the DAC filters only support 22-bit.
6.5 Left Justified Mode
In left justified mode, the MSB of DIN is sampled by RTKIP0 on the first rising edge of DACBCLK following a
DACLRCK transition. The MSB of the ADC data is output on DOUT and changed on the same falling edge of
ADCBCLK as ADCLRCK and may be sampled on the rising edge of ADCBCLK. ADCLRCK and DACLRCK are high
during the left samples and low during the right samples. The timing diagram is illustrated in Figure 5-16.
The polarity of ADCBCLK/DACBCLK and ADCLRCK/DACLRCK can be inverted by SPI register 01h and 02h.
Figure 6-4. Left Justified Mode Timing Diagram
6.6 Power Management
To meet suspend current specification of USB; CM6206 turns off most blocks when entering suspend. The
only two exceptions are power-on-reset and regulator.
To meet un-configured current specification of USB, CM6206 provides a control signal PDSW to turn off
external components. PDSW would be active when USB host does not configure CM6206. PDSW would also
be active when CM6206 is suspended. If serial EEPROM is exist, notice that it should not be powered off
anyway because it contains Vendor ID and Product ID which should be returned to USB host before CM6206
is configured.
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