Disable DDR pins or combine CS0 and CS1 pin.

[tamotsu]

Hi.

The Config-Tool can disable DDR pins. Can I set this programmatically?

Or can I set then CS1 pin to output the sameaddress as the CS0 pin?

Best regards.

[Rita_Wang]

Which product are you using?

[tamotsu]

Hi Rita_Wang.

I designed it using the i.MX7D SABRE circuit diagram as a refarence, but I changed the high DATA-BUS DDR CS0, CKE0 and ODT0 to CS1, CKE1 and ODT1.

I can't find a solution so I'm only using Low DATA-BUS DDR.

Can you please tell me if I can connect CS1 to CS0 using pin configuration? The CS1 pin can be disabled in the Config Tool.

Best regards.

[Rita_Wang]

Could you share your DDR section schemaitc to us? I need to check the design correctly first.

[tamotsu]

Hi Rita_Wang.

The DDR chematic is attached.

The incorrect signals are DDR_CS1, DDR_CKE1 and DDR_ODT1.

If I could make these high impedance (disabled) I would fix that with jumper wires.

Best regards.

[Rita_Wang · Accepted solution]

I have checked your schematic that your design only support 16bit datas as you said only using Low DATA-BUS. You can not use the disable pins in the config tool, you can make design change in your next version board.

[tamotsu]

Hi Rita.

Thank you very much.

Since it can be disabled in the Config tool, I was hoping to be able to set the pin.

As it turns out it is not possible, I will fix it in the next update as advised.

Best regards.

[Rita_Wang]

You are welcome. 16bit DDR can work on your side.