AM335x SPI first access time

Masakatsu Ishizaki

Prodigy 460 points

Hi, Champs

My customer want to use AM335x and SPI boot.

Does anyone know the amount of time between PWRONRSTn negate and SPI first access?

Regards, Ishizaki

over 12 years ago

0 Miroslav Kiradzhiyski XID over 12 years ago

TI__Mastermind 25235 points

Hi Masakatsu,

If I correctly understand your question, in order to try and boot first from the SPI memory right after PWRONRSTn you have to set the SYSBOOT pins for SPI boot (switches 1-4: 01101). I'm not able to measure the exact time it takes the ROM code to try and boot from the SPI memory.

Best regards,

Miroslav

0 JJD over 12 years ago in reply to Miroslav Kiradzhiyski XID

TI__Guru* 86740 points

I measured this to be around 170ms from rising edge of PWRONRST to first SPI access (if SPI0 is first in the boot sequence). Note this will be longer if SPI0 is further into the boot sequence.

regards,

James

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AM335x SPI first access time