AM3357 unused DDR I/F pin

g.f.

Other Parts Discussed in Thread: AM3357, AM3874

Hi,

I have a question about AM3357 DDR I/F.
I have no plan to use external memory, so how to handle unused DDR I/F pin ?

I checked the following TI wik:
http://processors.wiki.ti.com/index.php/AM335x_Schematic_Checklist#Unused_Signals
But there was no infomation about unused DDR pin.

My guess is like following:
Only VDDS_DDR pins need to be connect to the ground
and other pins are NC.

Is it right?

best regards,
g.f.

0 RY9983 over 12 years ago

Guru 10570 points

Hello, TI-san.

I have the same question.(My customer would like to NOT use the DDR I/F.)
There is guideline of OMAPL13x/C674x / AM1x Case on Wiki.
http://processors.wiki.ti.com/index.php/OMAP-L13x_/_C674x_/_AM1x_Schematic_Review_Checklist#DDR2.2FmDDR_2

Can I apply it to the AM335x DDR I/F?

If so, some pins are clear, but what should I treat about below signal ? :
- ddr_vtp
- ddr_resetn
- ddr_odt

Best regards, RY

0 RY9983 over 12 years ago in reply to RY9983

Guru 10570 points

Hello.

I am looking at the AM3874 datasheet.
Its DDR I/F is almost same as AM335x DDR I/F, and unused case is described in the datasheet.

- Can I apply this guideline to the AM335x DDR I/F?
Or,
- Could you tell me how can I treat DDR pins as unused case?

AM3874 datasheet (sprs695b, P269):

Best regards, RY

0 RY9983 over 12 years ago in reply to RY9983

Guru 10570 points

Hello.

This post is strongly needed to using AM335x for many users.
So, I posted to another thread.
http://e2e.ti.com/support/arm/sitara_arm/f/791/t/278135.aspx

Best regards, RY

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