AM2634-Q1: ball state during reset

Fan_Zhang

Part Number: AM2634-Q1
Other Parts Discussed in Thread: AM2634

Tool/software:

Hi, experts,

Checking in AM2634 datasheet, we find to most pins, it is marked "Off / Off / Off" in the column of "BALL STATE DURING RESET RX/TX/PULL".

How to understand ball state with RX Off, TX Off and PULL Off? Is it high impedance?

Thank.

6 months ago

0 Tejas Kulakarni 6 months ago

TI__Intellectual 1900 points

Hi Fan Zhang,

If you click on the [7] at the top of the table, you will be redirected to the explanation of that respective column (shown below) which is from Page 11 of 169 of the AM263x datasheet. Hope this clears it.

Thanks,
Tejas Kulakarni

0 Fan_Zhang 6 months ago in reply to Tejas Kulakarni

TI__Expert 4260 points

Hi, Tejas,

Yes, I notice this explanations.

Just want to confirm if "The input buffer is disabled" + "The output buffer is disabled" + "Internal pull resistors are turned off" = high impedance?

Thanks.

+1 Tejas Kulakarni 6 months ago in reply to Fan_Zhang

TI__Intellectual 1900 points

Hi Fan Zhang,

Yes, this would make the pin to be in high impedance mode. Even if Input buffer is enabled or ON(as seen in SPI0_CLK) it would be high impedance, since input buffer would not drive the pad but just sense it.

For further info, the SPI0_CLK has input buffer turned on, since it is one of the Bootstrap pins and would have to read the pin logic levels to determine the boot mode.

Thanks,
Tejas Kulakarni

0 Fan_Zhang 6 months ago in reply to Tejas Kulakarni

TI__Expert 4260 points

Hi, Tejas,

thanks for confirmation.

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AM2634-Q1: ball state during reset