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About using the RZQ for termination calibration

ZC0001
Beginner
198 Views

Hi,all.

According the Purpose IOs Handbook, different I/O Standards need different RZQ value for calibration, but only one RZQ are used for DDR3 controller. How to solve this problem?

Best Regards!

2020-05-27_125714.jpg

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1 Reply
NurAida_A_Intel
Employee
166 Views

Hi Sir,

 

The resistor value depends on the OCT termination type and signal leveling (for example 100R RZQ resistor value for 1.8V LVCMOS to allow 25R or 50R series termination).

 

Assuming the Rs = 50ohm, hence please use RZQ = 100ohm.

 

Hope this clear.

 

Thanks

 

Regards,

Aida

 

 

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