VTT termination with a single DDR4?

[maxime_guillot]

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

[ufedor]

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.

[maxime_guillot]

Hello,

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

Thank you

[ufedor]

Yes.