Linux/AM5728: RSTOUTn output problem

Wei He

Prodigy 200 points

Part Number: AM5728
Other Parts Discussed in Thread: TPS3808

Tool/software: Linux

As shown, all power supply is normal, the problem is that the RSTOUTn has been in the cycle reset

The following figure, POWERGOOD output is normal, TPS3808 normal, C63 (0.33uF) removed

Please help me to see what is the reason?

over 8 years ago

0 Biser Gatchev-XID over 8 years ago

TI__Guru**** 393215 points

Are you trying to boot or just checking the board?

0 Wei He over 8 years ago in reply to Biser Gatchev-XID

Prodigy 200 points

I turn on test my board, there is a problem, MMC1 (CLK, CMD, DATA) (W6, Y6, AA6, Y4, AA5, Y3) no signal, UART3 (TX, RX) (C28, D27) no signal, do not know where the problem

0 Biser Gatchev-XID over 8 years ago in reply to Wei He

TI__Guru**** 393215 points

What is the time period between two resets? What are your SYSBOOT settings?

0 Wei He over 8 years ago in reply to Biser Gatchev-XID

Prodigy 200 points

SYSBOOT set mount or unmount R81-86, the 100010b is now set

0 Biser Gatchev-XID over 8 years ago in reply to Wei He

TI__Guru**** 393215 points

I'm sorry. I cannot see much from this fragment. Can you post the full schematic?

0 Wei He over 8 years ago in reply to Biser Gatchev-XID

Prodigy 200 points

I removed the inductor L8. Power turn on, I use another 3.3V connection +VDD_3V3. 3.3V and +VIN at the same time the power on

I use the "insert file" upload full schematic, I do not know if you can see, if not, please tell me Email

0 Biser Gatchev-XID over 8 years ago in reply to Wei He

TI__Guru**** 393215 points

Thanks. I got it and removed the link from your post.

Now, first of all check the GPIO_GPMC_EN signal. This comes from AM572x pin AD2, which has pulldown enable at reset release time. At the same time you have an external pullup R93 on this signal. This may cause the U14/U15 switches OE signal level to be too low to disable them at boot time.

0 Wei He over 8 years ago in reply to Biser Gatchev-XID

Prodigy 200 points

Thank you very much, now can boot from the SD card, the problem really relevant SYSBOOT

0 Biser Gatchev-XID over 8 years ago in reply to Wei He

TI__Guru**** 393215 points

Glad you solved the issue, and thanks for updating the thread.

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Linux/AM5728: RSTOUTn output problem