GS4915 Datasheet, PDF (19/26 Pages) Gennum Corporation – ClockCleaner™

GS4915 Data Sheet
Table 3-5: Output Behaviour in Manual Bypass Mode
FCTRL[1:0]
Input
DOUBLE
LOCK
Output
Auto [00]
27MHz
X
HIGH*
27MHz
74.25MHz
X
HIGH*
74.25MHz
148.5MHz
X
HIGH*
148.5MHz
Other
X
LOW
Input
Fixed – 27MHz
[01]
27MHz
74.25MHz
X
HIGH*
27MHz
X
LOW
74.25MHz
148.5MHz
X
LOW
148.5MHz
Other
X
LOW
Input
Fixed –
74.25MHz [10]
27MHz
74.25MHz
0
LOW
27MHz
0
HIGH*
74.25MHz
148.5MHz
0
LOW
148.5MHz
Other
0
LOW
Input
Fixed –
27MHz
X
LOW
27MHz
148.5MHz [11]
74.25MHz
X
LOW
74.25MHz
148.5MHz
X
HIGH*
148.5MHz
Other
X
LOW
Input
*NOTE: Although LOCK = HIGH under these conditions, the output clock will be a copy of the
selected input clock and will have the jitter of the input clock.
Table 3-6: Output Behaviour in Forced Output Mode
FCTRL[1:0]
Input
DOUBLE
LOCK
Auto [00]
Fixed – 27MHz
[01]
27MHz
74.25MHz
148.5MHz
Other
27MHz
74.25MHz
148.5MHz
Other
X
HIGH
0
HIGH
1
HIGH
X
HIGH
X
LOW
X
HIGH
X
LOW
X
LOW
X
LOW
Output
27MHz
74.25MHz
148.5MHz
148.5MHz
Last locked*
27MHz
27MHz
27MHz
27MHz
39145 - 3 November 2007
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