STM32H72 Flash recommended Number of wait state

[SreejithNair]

Hi ,

While checking the "Flash recommended number of wait state for programming delay" list for my project on STM32H723 target, observed the list is not up to 550Mhz. 

It's showing VOS0(boost mode) [ 70Mzh, 140Mhz, 210Mhz, 275Mhz] , It's listing max LATENCY 3 

I think the list should show like : [ 70Mzh, 140Mhz, 210Mhz,280Mhz,350Mhz,420Mhz,490Mhz,550Mhz] , so the Max LATENCY value can be 7 for 550Mhz.

Same applies to VOS1.

I am referring latest STM32H72 User Guide and Data sheet. Please clarify "Flash recommended number of wait state for programming delay" topic.

 

[AScha.3]

Hi,

>STM32H723 target, observed the list is not up to 550Mhz. 

Right. Its the AXI clock here...half the core frequency.

 

 

[SreejithNair]

Thanks Ascha!

Why it's not always half the core frequency, I checked the same on STM32H7A3. There both Core frequency and AXI frequency is same. I think Max AXI frequency can be in 200Mhz range. 

 

 

[AScha.3]

>I think Max AXI frequency can be in 200Mhz range. 

Maybe this IS the reason : on both cpu on VOS0 -> about 280MHz max. AXI frequency

 

+

So on very fast core  -> AXI frequ./2 from core ; means : just the core can run 500Mhz, not the other parts of chip.

[Tesla DeLorean]

>>While checking the "Flash recommended number of wait state for programming delay" list for my project on STM32H723 target, observed the list is not up to 550Mhz.

Yes, because the maximum MCU frequency is LOWER