Hello,
My customer has a question about CDCM6208.
[Q]
They want to input with LVCMOS in PRI_REF / SEC_REF.
Is my understanding correct ?
<My understanding>
CDCM6208 can input with LVCMOS Level directly.
In this case, they need the following configuration.
- DC Coupled 3.3V LVCMOS Level
* Connect VDD_PRI_REF=3.3V for primary / VDD_SEC_REF=3.3V for secondary
* Connect PRI_REFP with LVCMOS clock source
* PRI_REFN can be left floating
* Set Reg4[4:3]=1x for primary / Reg4[7:6]=10 for secondary
* Set Reg4[2]=1 if they want to use primary input / Reg4[5]=1 if they want to use secondary input
* Set Reg4[0]=1 for primary / Reg4[1]=1 for secondary
- DC Coupled 2.5V LVCMOS Level
* Connect VDD_PRI_REF=2.5V for primary / VDD_SEC_REF=2.5V for secondary
* Other configurations are same as DC Coupled 3.3V LVCMOS Level
- DC Coupled 1.8V LVCMOS Level
* Connect VDD_PRI_REF=1.8V for primary / VDD_SEC_REF=1.8V for secondary
* Set Reg4[0]=0 for primary / Reg4[1]=0 for secondary
* Other configurations are same as DC Coupled 3.3V LVCMOS Level
Best Regards,
Hiroshi Katsunaga
