VTT termination with a single DDR4?

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VTT termination with a single DDR4?

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maxime_guillot
Contributor III

Hello,

I am using the LS1046A for a new design with one DDR4 16 bits memory. In all the AN I read, there is mention of use of VTT termination resistors. Is it really mandatory even with only one DDR4 16 bits memory?

Thank you

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ufedor
NXP Employee
NXP Employee

You wrote:

one DDR4 16 bits memory.

The processor supports data bus widths:
• 64-/72-bit
• 32-/40-bit

Termination generally is required to match signals lines to eliminate excessive ringing.

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maxime_guillot
Contributor III

Hello,

Does it mean I need at least 2X DDR4 16 bit like the MT40A512M16?

Thank you

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ufedor
NXP Employee
NXP Employee

Yes.

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