Our customer connected the DDR_PADREF pin to ground through 50KΩ resister which is not 50Ω.
Can 50KΩ resistor be used?
Does it have the problem that 50KΩ resistor is used?
The DDR_PADREF pin is used for the output impedance control.
http://e2e.ti.com/support/dsp/sitara_arm174_microprocessors/f/416/t/60975.aspx
When the 50Ω resistor is used, I guess the output impedance is proper to drive the memory lines.
When the 50KΩ resistor is used, I guess the output impedance is not proper to drive the memory lines.
If the output impedance of this case is very high, I guess the impedance matching is impossible.
Best regards,
Daisuke