Mity CPU Platforms » MitySOM-AM62, MitySOM-AM62A, & MitySOM-AM62P

06/05/2023

JC 06:46 PM PCB Development: RE: VSEL_SD functionality

No problem. I condensed all this info into a wiki page for future reference as well. And have initiated changes for our datasheet and errata to correct the signal name.
https://support.criticallink.com/redmine/projects/mitysom_am62x... Jonathan Cormier

PS 06:25 PM PCB Development: RE: VSEL_SD functionality

Thank you very much to both of you for the quick and extensive answer. The key information that the voltage of VDDSHV5 is controlled via the VSEL_SD pin might be worth putting into the datasheet. Special thanks for the pointers on the er... Pal Szabo

JC 05:51 PM PCB Development: RE: VSEL_SD functionality

The software side of the SD voltage selection is configured here:
https://support.criticallink.com/gitweb/?p=linux-ti.git;a=blob;f=arch/arm64/boot/dts/ti/k3-am62x-mitysom-devkit.dts;h=725aba2f30bb44c86b9d86d432cae15f3b08f067;hb=refs/h... Jonathan Cormier

JC 03:02 PM PCB Development: RE: VSEL_SD functionality

Pal Szabo wrote:
> What is the functionality of the VSEL_SD pin (position 176 on the SODIMM connector)? Is it the same signal as VD_SEL mentioned in Note 8 in the MitySOM-AM62 datasheet on page 18? The datasheet does not contain more in... Jonathan Cormier

PS 09:05 AM PCB Development: RE: JTAG TRSTn pulldown and other JTAG pullups

Thank you very much Mike, this clarifies the implemented pulls! Pal Szabo

06/04/2023

MW 10:37 AM PCB Development: RE: VSEL_SD functionality

Hi Paul,
The VSEL_SD pin is connected to pin 12 of a TPS65219 PMIC on the SOM. VSEL_SD selects which voltage is applied to the AM62x VDDSHV5 voltage domain. The voltage is also present on the edge connector pin 172 as (VDDSHV_SDIO).... Michael Williamson

06/03/2023

PS 07:12 PM PCB Development: VSEL_SD functionality

What is the functionality of the VSEL_SD pin (position 176 on the SODIMM connector)? Is it the same signal as VD_SEL mentioned in Note 8 in the MitySOM-AM62 datasheet on page 18? The datasheet does not contain more information about it, ... Pal Szabo

06/02/2023

MW 12:56 PM PCB Development: RE: JTAG TRSTn pulldown and other JTAG pullups

I corrected the last post. TDO is not pulled up or down on the SOM. Michael Williamson

MW 12:55 PM PCB Development: RE: JTAG TRSTn pulldown and other JTAG pullups

Hello,
The SOM includes the following on the JTAG related lines:
* 4.7K Pulldown on TRSTn
* 4.7k Pullup to VDDSHV_MCU on the following lines:
** TCK
** TDI
** TMS
** EMU0
** EMU1
This is a snippet of the schematic on the S... Michael Williamson

PS 12:03 PM PCB Development: JTAG TRSTn pulldown and other JTAG pullups

The AM62x datasheet states (in section 6.4) that an external pulldown is required on the TRSTn line. Is this implemented on the module (if so, it might not be publicly documented), or the host board needs to add this pulldown?
What ab... Pal Szabo