Why is MCLK2 unused in the CODEC ?

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Hardware project of MOD Duo X

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Why is MCLK2 unused in the CODEC ? #30

Closed felipesanches closed 9 years ago

felipesanches commented 9 years ago

The A20 signals I2S_LRCK and I2S_BCLK are connecter to both LRCK1/LRCK2 SCLK1/SCLK2.

But I2S_MCLK is only connected to MCLK1. The CODEC's MCLK2 pin remains not-connected. Why?

odurc commented 9 years ago

From CS4245 datasheet, page 30, section 4.2.1: "By default, the CS4245 operates in Synchronous Mode with both serial ports synchronous to MCLK1. In this mode, the serial ports may operate at different synchronous rates as set by the ADC_FM and DAC_FM bits, and MCLK2 does not need to be provided (the MCLK2 pin may be left unconnected)."