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Drive Strength Field specification

Question asked by Bob Simning on Jun 20, 2014
Latest reply on Jul 3, 2014 by jiri-b36968

I need to set the drive strength for some DDR pins to 40 ohms. The Vybrid manual does not explicitly specify the correct setting for selecting 40 Ohm if DDR.

Should  I use 110 for 40 Ohm if DDR?

 

This is the excerpt from the manual

 

Vybrid Reference Manual, Rev. 7, 06/2014, p.221

 

     Drive Strength Field. Select one of the following values for pad: PTA6.

     000 output driver disabled;

     001 150 Ohm (240 Ohm if pad is DDR)

     010 75 Ohm (120 Ohm if pad is DDR)

     011 50 Ohm (80 Ohm if pad is DDR)

     100 37 Ohm (60 Ohm if pad is DDR)

     101 30 Ohm (48 Ohm if pad is DDR)

     110 25 Ohm

     111 20 Ohm (34 Ohm if pad is DDR)

 

Thanks

Bob

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