iMX8MP drive strength x1..x6 meaning

[anthony-loiseau-act]

Drive strength pads of iMX8MP processors can be configured using DSE field of SW_PAD_CTL_PAD_xxx registers (one per pad), among values "X1", "X2", "X4" or "X6".

I fail to find X1..X6 DSE meaning anywhere in iMX8MP RM, and other processors mostly uses Ohms here so I can't peek an details in there RM (iMX6 and iMX8M at least).

What is the meaning of iMX8MP X1..X6 DSE setting choices?

[anthony-loiseau-act]

OK, so as opposite to iMX6ULL or iMX8M for example, iMX8MP DSE does not have very-known DSE Ohms values.

Thanks.

[Dhruvit · Accepted solution]

Hi @anthony-loiseau-act,

Please find below the details for each drive strength,

00 X1- low drive strength
01 X4- high drive strength
10 X2- medium drive strength
11 X6- max drive strength

Best Regards,
Dhruvit.

[NLFOHE]

Hi,

To be sure some extra questions:

DSE setting 10x is factor X2 and "4mA" strength?

DSE setting 01x is factor X4 and "8mA" strength?

Not really logical, binary wise...

My colleague found specification below:

This means:

50 MHz = 192 = 010 = X4

100 MHz = 194 = 100 = X2

200 MHz = 196 = 110 = X6

What do you think about this?

Are you sure there is no relation to Zo value to the mA settings?