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S3C2451X RISC MICROPROCESSOR
CLKSRC[8] (register)
0
0
1
1
Loop filter capacitance
Fin
Fout
External capacitance used for X-tal
Feedback Resistor used for X-tal
Table 2-3. Clock source selection for the EPLL
CLKSRC[7] (register)
X
X
0
1
Table 2-4. PLL & Clock Generator condition
C
LF
-
-
C
EXT
R
Figure 2-4. Main Oscillator circuit examples
Preliminary product information describe products that are in development,
for which full characterization data and associated errata are not yet available.
Specifications and information herein are subject to change without notice.
OM[0]
0
1
X
X
EPLLCAP :Typical 1.8nF 5%
F
SYSTEM CONTROLLER
EPLL Reference Clock
EXTCLK
EXTCLK
MPLLCAP : N/A
MPLL: 10 – 30 MHz
EPLL: 10 – 40 MHz
MPLL: 40 – 1600 MHz
EPLL: 20 – 600 MHz
15 pF
1Mohm
XTI
XTI
2-7
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