I want to change the system clock speed. However, to do that I need to change SW3 6-8 bits(Default 100). When I change from 100 to 110 which is 125 MHz, the system could not boot. Please find the output in the attachment.
Then I have tried all combination, the result is that I can cont increase system clock more than 100MHz.However I can decrease to 75 MHz. So why does system clock speed inrease? How can I increase that?