Compute Module • CANNOT Release PCIE nRST

Hello,

I have designed peripheral board for CM5 compute module with PCIe switch - asm1182 extension.

I'm not so sure about handshaking / speed negotiation procedure of PCIe switch but my board got a problem.

The symptom is that PCIe nRST is not released after boot up. (Raspbian boot was totally successful, except it doesn't recognize PCIe switch..)

I'm checking up the boot log.

Meanwhile, Can anybody help me to check up the condition for CM5 to release PCIe nRST Pin level to high? (like 100MHz reference clock... on PCIe CLK lane....)

Statistics: Posted by pepsipower — Fri May 23, 2025 4:48 am

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