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CS8406-IS

192 kHz Digital Audio Interface Transmitter

Cirrus Logic 

CS8406

4. THREE-WIRE SERIAL INPUT AUDIO PORT

A 3-wire serial audio input port is provided. The interface format can be adjusted to suit the at-

tached device through the control registers. The following parameters are adjustable:

• Master or slave

• Serial clock frequency

• Audio data resolution

• Left or right justification of the data relative to left/right clock

• Optional one-bit cell delay of the first data bit

• Polarity of the bit clock

• Polarity of the left/right clock. (By setting the appropriate control bits, many formats are pos-

sible).

Figure 7 shows a selection of common input formats with the corresponding control bit settings.

In master mode, the left/right clock and the serial bit clock are outputs, derived from the OMCK

input pin master clock.

In slave mode, the left/right clock and the serial bit clock are inputs. The left/right clock must be

synchronous to the OMCK master clock, but the serial bit clock can be asynchronous and dis-

continuous if required. The left/right clock should be continuous, but the duty cycle can be less

than the specified typical value of 50% if enough serial clocks are present in each phase to clock

all the data bits.

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DS580F1

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