Interfacing 2 DDR4 (512 Meg x 16) discrete chips with T1040

[xarowubas]

Hello,

I'm designing a custom board around T1040. Can I interface only 2 DDR4 (512 Meg x 16) discrete chips with 64 bit DDR controller of T1040. As these two x16 chips will require 32 bit data bus so remaining 32 bits of DDR Controller will be No Connect. Will this cause problem?

Thanks,

Xaro

[ufedor · Accepted solution]

T1040 DDR controller supports 32-bit data bus - refer to the QorIQ T1040 Reference Manual, 14.2 DDR Features:

"• Data bus widths supported:
• 64-/72-bit
• 32-/40-bit"

Also please refer to the AN4825 - T1040 Family Design Checklist, Table 9. DDR controller pin termination checklist where it is stated that unused DDR interface signal can be left unconnected.