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lbouc.2
lbouc.2
Associate
Apr 15, 2022 12:44 PM UTC
Question

Le SAES proposé sur STM32U85xx est basé sur quel système d'horloge? Quels documents font référence et permet d 'avoir plus d'informations ?

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5 replies

Tesla DeLorean
Tesla DeLorean
Guru
Apr 15, 2022 2:03 PM UTC

"The SAES offered on STM32U85xx is based on which clock system? Which documents refer and provide more information?"

You mean the STM32U575/585 series?

SAES?

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lbouc.2
lbouc.2Author
Associate
Apr 15, 2022 2:12 PM UTC

oui bien sur, petite erreur de frappe.

Diane POMABIA
ST Employee
May 10, 2022 1:44 PM UTC

Hi @lbouc.2​ ,

can you explain what you mean by "clock system"? 

According to the reference Manual , SAES uses 2 clocks signals:

  • clock for system in input (saes_hclk) : AHB Bus clock
  • clock for Core system (saes_ker_ck): RCC_SHSI_CK clock

You can find more informations about these clocks in reference Manual of STM32U5 Series : https://www.st.com/en/microcontrollers-microprocessors/stm32u5-series.html#documentation

DianeP

lbouc.2
lbouc.2Author
Associate
Jun 17, 2022 9:46 AM UTC

Hello @diane POMABIA​ ,

thanks for your answer.

After more research, I dont't understand the execution times that I get.

In fact, when I executing an AES-128 in mode ECB, I get a time of 19 µs for the encryption.

And when I executing an SAES-128 in mode ECB, I get a time of 58 µs for the same encryption.

So, I don't undertand why I find a time multiplied by 3, whereas I find in the manuel a coefficient of 10 (as you can see in the picture).
_legacyfs_online_stmicro_images_0693W00000Ns4fhQAB.pngI am attaching the sources files which make it possible to obtain the times that I have indicated.

Sorry for my english, it's not my native language.

Lina BOUCHFANJ

lbouc.2
lbouc.2Author
Associate
Jun 17, 2022 9:47 AM UTC

And the second main, that I use for the AES

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