AM3352 Boot Fail Problem (don't download by using uart0 and it is not nand 's boot )

diggo yoon

Other Parts Discussed in Thread: AM3352

I have a custom board based on AM3352.

But not boot by using uart0 that is't print "CC" and download boot's img with jtag , then it configure sysboot at NAND boot

But don't yet.

Now it is verify sysboot configuration (uartboot or nandboot ) with jtag 's control_register memory map

and

Forums search same problem ( http://e2e.ti.com/support/dsp/sitara_arm174_microprocessors/f/791/t/237315.aspx) and any problem

it 's checks

we doubt that EVM is when high then sysboot swtich at 3.1V but custom board is when high then sysboot swtich at 2.3V.

and VDDS Voltage is 3.3 V but EVM is 1.8V.

and Voltage sequence is different with EVM and Custom board

Custom board isn't using POWER MANAGEMENT IC

it 's wrong .

Thank you

Kind Regards,

over 12 years ago

0 Biser Gatchev-XID over 12 years ago

TI__Guru**** 393215 points

Hi,

VDDS voltage MUST be 1.8V. Check the AM335X Datasheet, Table 3-4. 3.3V is not allowed on VDDS. Voltage sequencing must follow AM335X Datasheet, Section 4.1.1 and 4.1.2.

0 diggo yoon over 12 years ago in reply to Biser Gatchev-XID

Prodigy 240 points

Thank you for Answer

I check Datasheet . But I Read Table 3-4 VDDS⁽³⁾Recommand

that is " (3) VDDS should be supplied irrespective of 1.8-V or 3.3-V mode of operation of the dual-voltage IOs."

Is not it ?

And it is our board 's Voltage sequencing that below picture it

CH1 is Power on Reset and CH2 is Other 's Power (Same Sequense is 1.1V, 1.8V, 3.3V)

Now is it

Is that Correct ?

Kind Regards,

0 Biser Gatchev-XID over 12 years ago in reply to diggo yoon

TI__Guru**** 393215 points

Power sequencing should be: 1.8V supplies ---> 3.3V supplies ---> 1.1V supplies. And VDDS must be 1.8V, not 3.3V.

0 diggo yoon over 12 years ago in reply to Biser Gatchev-XID

Prodigy 240 points

Thank you for Regard.

I'm your recommend , After check it , reply ..

Good Recommend , for Biser..

0 diggo yoon over 12 years ago in reply to diggo yoon

Prodigy 240 points

i'M clear this problem.

Now. uart0 print "CC"..

it 's connect boot 's relation power . so this solve

Thank you.

Regard answer...

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AM3352 Boot Fail Problem (don't download by using uart0 and it is not nand 's boot )