PCM4222: Running in slave mode

matt newport

Part Number: PCM4222

Hello. 4 PCM4222's in a system, one master and three slave. Do all four devices' control pins get used (FS0/FS1, OWL0/OWL1, and FMT0/FMT1) or only the master device? Any input is appreciated.

over 3 years ago

0 Zak Kaye over 3 years ago

TI__Mastermind 23050 points

Hi Matt,

The control pins of each device need to be configured independently. You'll also want to make sure the SUB pins are configured appropriately for each device so that the data is aligned in order.

Best,

Zak

0 matt newport over 3 years ago in reply to Zak Kaye

Prodigy 220 points

Thanks for the reply, Zak.

I'm assuming all the converter's control pins can be tied to single sets of lines without issue? Like a global control for sample rate, word rate, etc.?

It was my impression that the SUB pins are for TDM format, where data outputs are muxed onto a single bus. In this case, all converters are being given their own individual AES encoders. Do the SUB pins still apply in that case?

0 Zak Kaye over 3 years ago in reply to matt newport

TI__Mastermind 23050 points

Hey Matt,

Yes the control pins could be tied together and driven high/low with a GPIO if desired. I assumed you were using TDM mode since one device is master and the other 3 slaves, but if you are using separate I2S buses then you are correct, the sub pins can all be tied low.

Best,

Zak

0 matt newport over 3 years ago in reply to Zak Kaye

Prodigy 220 points

Woot. Thanks!

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PCM4222: Running in slave mode