i.MX6 decoupling and bulk capacitors for DDR VTT.

[satoshishimoda]

Hi community,

Our partner have a question about i.MX6 DDR layout.

Please see chapter 3.6 of Hardware Development Guide (IMX6DQ6SDLHDG Rev.1)

[Q1]

It mentions about decoupling and bulk capacitors for VTT island, but not mention about its layout.

Would you let me know the recommended layout of decoupling and bulk capacitors for VTT?

(e.g. xx mils trace between decoupling cap and yyy)

[Q2]

About the number of capacitors, its says "Place one or two 0.1 μF decoupling capacitors by each termination RPACK on the VTT".

What is RPACK?

Best Regards,

Satoshi Shimoda

[art · Accepted solution]

RPACK means the Resistor Package, a SMD component, containing a number of resistors, typically, 4 or 8. The decoupling capacitors should be placed as close to the resistor packages as possible keeping minimum possible traces length.

Have a great day,
Artur

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