iMX28 : EMI pin keeper function

koichisakagami — Tue, 16 Jun 2015 06:30:23 GMT

Dear community,

We design the custom board .
We need information about EMI pin behavior.

The EMI pin is EMI_ODT1, EMI_CE1N.

The register setting is as follows.
HW_PINCTRL_MUXSELxx = 11 ( function disable )
PINCTRL Bank 5/6 Pad Keeper Disable Register = 0 ( enable the internal keeper)

Question1.
Is the internal keeper function enabled ?

Question2.
If the "PINCTRL Bank 5/6 Pad Keeper Disable Register" set as "1" ( disable the internal keeper),
then, Is the pin state high impedance ?

Best Regards,
Koichi Sakagami

Re: iMX28 : EMI pin keeper function

Yuri — Tue, 16 Jun 2015 07:04:19 GMT

The internal keeper function is enabled.

According to Figure 9-1 (Pad Diagram) of the i.MX28 Reference Manual

the internal keeper can be enabled / disabled separately, without reference
to multiplexing options.

2.
From section 9.1 (Pin Control and GPIO Overview) :
“All EMI pins' internal keepers can be disabled to allow them to change to

a high impedance state […]”.

Have a great day,
Yuri

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iMX28 : EMI pin keeper function

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