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S3C2440A RISC MICROPROCESSOR ELECTRICAL DATA
27-9
A.C. ELECTRICAL CHARACTERISTICS
1/2 V
DD
1/2 V
DD
t
XTALCYC
NOTE:
Clock input is from the X
TIpll
pin.
Figure 27-2 XTIpll Clock Timing Diagram
t
EXTHIGH
V
IH
1/2 V
DD
V
IL
V
IL
V
IH
V
IH
1/2 V
DD
t
EXTLOW
t
EXTCYC
NOTE:
Clock input is from the EXTCLK pin.
Figure 27-3 EXTCLK Clock Input Timing Diagram
HCLK
(internal)
EXTCLK
t
EX2HC
Figure 27-4 EXTCLK/HCLK in case when EXTCLK is used without the PLL