[AM572x] Confirm the GPMC_FCLK

Kaka

Hi TI Experts,

Please let me confirm the following question.

[Question]
I asked you about the frequency of GPMC_FCLK. And I got the answer that the frequency is 133MHz at AM572x booted. By the way, the AM572x can use some external referece clock like 20MHz, 27MHz and 19.2MHz.
Is the GPMC_FCLK set the frequency as 133MHz at boot time with using the above any external recommended crystal values?

If you have any questions, please let me know.

Best regards.

Kaka

over 9 years ago

0 Biser Gatchev-XID over 9 years ago

TI__Guru**** 393215 points

The GPMC_FCLK is sourced from a PLL. ROM code detects the main crystal frequency set by SYSBOOT[9:8] (AM572X TRM Rev. E section 33.2.4.2)and sets all necessary PLLs accordingly.

0 Kaka over 9 years ago in reply to Biser Gatchev-XID

Guru 24520 points

Hi Biser,

Thank you for your comments.
I got it. I understand that the ROM code will be set the PLL against for external crystal.
Right?

Best regards.
Kaka

0 Biser Gatchev-XID over 9 years ago in reply to Kaka

TI__Guru**** 393215 points

Yes, that is correct.

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[AM572x] Confirm the GPMC_FCLK