My board is NS7520 dev Board. There are a oscillator and a crystal on it. I know there is a configure field in a register of the cpu.But both of them works with the same output line. I think that there must be a conflict.But my board works in a good sate. I am drawing the my schematic diagram according the dev board. I want the cpu to work at 46Mhz. Can I only have a crystal of 18.*Mhz.
7520 is a completely new chip not like the 50 because it allows people to run with external oscillator with or with out pll disabled.