STM32F4 max speed with FSMC

[kb_it]

Posted on February 08, 2012 at 20:30

I am new to arm and designing a new prototype board with a STM32F417 and 2 NAND Flash chips.

In the data sheet it says the HCLK can go to 168MHz BUT it also says that the FSMC maximum clock is 60MHz at 3.3V.  Does this mean the maximum speed is only 60MHz if you have external memory connected?

Konrad

[kb_it]

Posted on February 08, 2012 at 21:37

Just found the answer to my own question,

the data sheet, page 61 table 11 just says FSMC maximum clock frequency which I took to be the HCLK in, but it actually means the maximum external access frequency!