CDCM6208: How to configure CDCM to a particular PIN MODE using control pins [4:0] ?

Venkata Rao Medida

Part Number: CDCM6208

Hi TI,

We are using CDCM6208V1 in our design, without host. So we want to configure it with PinMode 29-V1, we didn't find any information on how to configure CDCM to a particular mode i.e. what to do with PIN [4:0]. Can you please guide us ASAP ?

over 4 years ago

0 Noel Fung over 4 years ago

TI__Guru** 110380 points

Hi Venkata,

To use pin mode, tie the related pins HIGH or LOW according to datasheet requirement.

0 Venkata Rao Medida over 4 years ago in reply to Noel Fung

Prodigy 10 points

Hi NOEL,

Thanks for your prompt response.

Can you guide me how to implement 0x1C in PIN[4:0] ?

I have one more doubt to resolved :

-> As per the datasheet for PinMode 29-V1

fin(PRIMARY_REF) is 10Mhz CMOS type and

fin(SECONDARY_REF) is 10 Mhz CRYSTAL.

REF_SEL is AUTO.

My QUESTION is

Is it mandatory to provide both PRIMARY_REF and SECONDARY_REF when the REF_SEL is AUTO ?

If not how to configure CDCM for one REF and how to terminate the unused one ?

+1 Noel Fung over 4 years ago in reply to Venkata Rao Medida

TI__Guru** 110380 points

Hi Venkata,

0x1C = 1 1100, so tie PIN[4:0] according to this pattern.

Since REF_SEL is Auto, you can put your 10MHz reference to either input. Primary input has priority so you may want to put the reference clock over there. The secondary input pins can be shunt to ground via capacitors.

0 Venkata Rao Medida over 4 years ago in reply to Noel Fung

Prodigy 10 points

Thanks for your Support Noel.

Clock & timing

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CDCM6208: How to configure CDCM to a particular PIN MODE using control pins [4:0] ?