AM5728: Bypass capacitor for unused DDR power line

Hi Biser,

Thank you for the reply and sorry for the delay.
I have additional question about the bypass capacitor for unused DDR power rail.

In AM5728 datasheet(SPRS953E) page.383 Table 8-8, there are minimum numbers and capacitance for "vdds_ddrx".
And also there are example of high-speed bypass capacitors for AM572x "vdds_ddrx" in the following application report.
www.ti.com/.../sprac76c.pdf
As you mentioned above we will implement the bypass capacitors on unuesd DDR2 power rail "vdds_ddr2".
But how about bypass capacitors for "vdds18v_DDR2"?
In datasheet and above application report, there are no example for "vdds18v_DDR2".
I checked schematics of the AM572x GP EVM
On GP EVM, there was four 0.1uF and one 10uF capacitors for "vdds18v_DDR2".
Should we also implement the bypass capacitor on "vdds18v_DDR2"?
If yes, should we refer to GP EVM?

best regards,
g.f.

Hi Biser,

Thank you for the reply and sorry about the delay.

Let me ask again to make me sure.
In AM572x GP EVM, common decoupling are used on the 1.8V power rail(VDD_1V8) which going to VDDS18V_DDRx
and also additional decoupling are used on VDDS18V_DDRx.
So, as you said, we can refer to IDK schematic and this additional decoupling are not needed
for VDDS18V_DDRx, is it correct?

best regards,
g.f.