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The makes for cleaner board definitions like:
Divider output clock = Divider input clock * ((PLLFLLFRAC+1)/(PLLFLLDIV+1))
SIM_CLKDIV3_FREQ = BOARD_SOPT2_FREQ × [ (PLLFLLFRAC+1) / (PLLFLLDIV+1)]
90 Mhz = 180 Mhz X [(0 + 1) / (1 + 1)]
#define BOARD_SIM_CLKDIV3_PLLFLLFRAC 1
#define BOARD_SIM_CLKDIV3_PLLFLLDIV 2
#define BOARD_SIM_CLKDIV3_FREQ (BOARD_SOPT2_FREQ * (BOARD_SIM_CLKDIV3_PLLFLLFRAC / BOARD_SIM_CLKDIV3_PLLFLLDIV))
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