Where are the resistors for M.2 SDIO interface on imx8M-EVK board?

[garyjiang]

Hi,

I am working on the M.2 SDIO interface on the MCIMX8M-EVK board. We found that the resistors for M.2 SDIO interface are not mounted. 

There are 8 resistors(from R1429 to R1436) based on the schematic. These resistors are marked (DNP, do not place) on the schematic(see attachment).  From the board I can only find two R1430 and R1434. Where is the rest?

In order to pass the signal to M.2 adaptor board, we need to mount these.

Thanks,

Gary

[Pavel]

Install Allegro/OrCAD/SIP/MCM FREE Physical Viewers 17.2:

https://www.cadence.com/content/cadence-www/global/en_US/home/tools/allegro-downloads-start.html

Load and unpack design files for the i.MX 8M Evaluation Kit (EVK)(REV 0):

https://www.nxp.com/webapp/Download?colCode=MCIMX8M-EVK-DESIGNFILES&appType=license

Open the LAY-29615_B2.brd using AllegroFREE Physical Viewers 17.2.

Enable Display/Highlight and Display/Element. See Clipboard02 and Clipboard04 files in the attachment.

Set Visibility - Top.

Use Find to detect component location (origin-xy). See Clipboard06.jpg file.

This component is highlighted. See Clipboard08.jpg file.

Note: R1436 is located on the Bottom.

Have a great day,
Pavel Chubakov

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[bernhardfink · Accepted solution]

Look into the attched board layout from the A1 board version (sorry, I just have this version currently available as PDF), using the search function of a PDF reader you should be able to find the resistor locations.

With this link

https://www.nxp.com/webapp/Download?colCode=MCIMX8M-EVK-DESIGNFILES&appType=license&Parent_nodeId=15... 

you should be able to download the design files for the 8M-EVK-B3 and check by yourself

Regards,

Bernhard.