[SI-LIST] Re: DDR memories- Capacitor
- From: <ramesh.p@xxxxxxxxxxx>
- To: <mani.kumar@xxxxxxxxxxxxxxxxxxxx>, <si-list@xxxxxxxxxxxxx>
- Date: Fri, 16 May 2014 12:21:03 +0000
Hi Mani Kumar Anna ,
The capacitor could be used to isolate Vtt or Vdd planes from DDR clock
switching signals. If your designs does not deal with complex topology or high
speed operation, then I think you no need to use AC cap to Vtt or Vdd.
You can just connect the common mode termination (two 50 Ohms resistors) to
voltage rail. This helps to meet the crossover over point margins at your
memory device.
Regards,
Ramesh Ponnada
Agilent Technologies, India.
-----Original Message-----
From: si-list-bounce@xxxxxxxxxxxxx [mailto:si-list-bounce@xxxxxxxxxxxxx] On
Behalf Of Pulikonda Mani Kumar
Sent: Friday, May 16, 2014 1:35 PM
To: si-list@xxxxxxxxxxxxx
Subject: [SI-LIST] DDR memories- Capacitor
Hi,
For DDR memories, capacitor is connected between the VTT (half of VDD) and VDD
in few reference design.
Please let me know the usage of this.
Regards,
Mani
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