FUJITSU MB91460 SERIES FR60 User Manual
Page 230

214
Chapter 14 PLL Interface
6.Clock Auto Gear Up/Down
this equals to (resolved closed arithmetic series of the first sum term):
with i = G ; j = G - M ; mul = MULG ; t = 1/f(pllout)
For the above given setting this equals 1483 PLL output clock cycles with a duration from the start fre-
quency to the target frequency of 9262500 ps (about 9.3 us).
duration
mul t
i
i
1
+
(
) i 2
+
(
)
⋅
⋅
6
------------------------------------------
k
i k
–
1
+
(
)
⋅
k
j
1
+
=
i
∑
–
⎝
⎠
⎜
⎟
⎛
⎞
⋅ ⋅
=
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