GS4915 Data Sheet
Table 1-1: Pin Descriptions (Continued)
Pin
Name
Timing
Type
Description
Number
18
19
DOUBLE
Non
synchronous
Input
CONTROL SIGNAL INPUT
Signal levels are LVCMOS compatible.
Controls the output frequency of the cleaned clock, for HD input clocks.
See Section 3.5 for operation.
SKEW_EN
Non
Input
CONTROL SIGNAL INPUT
synchronous
Signal levels are LVCMOS compatible.
Selects the phase of the output clock with respect to the selected input
clock.
See Section 3.6 for operation.
21
LOCK
Non
Output
STATUS SIGNAL OUTPUT
synchronous
Signal levels are LVCMOS compatible.
This pin will be HIGH when the output clock is locked to the selected input
clock.
It will be LOW otherwise.
23
24
SE_VDD
–
–
Power
Output
Positive power supply connection for the single-ended clock driver.
Determines the output level of CLKOUT_SE. Connect to filtered +1.8V DC
or +3.3V DC.
NOTE: If the single-ended clock output is not used, this pin should be tied
to ground.
CLKOUT_SE
CLOCK SIGNAL OUTPUT
Signal levels are LVCMOS compatible.
Single-ended video clock output signal.
See Section 3.7.2 for operation.
25
27
D_VDD
–
–
–
Power
Power
Output
Positive power supply connection for the single-ended output clock buffer.
Connect to filtered +1.8V DC.
NOTE: If the single-ended clock output is not used, this pin should be tied
to ground.
DIFF_OUT_VDD
Positive power supply connection for the LVDS clock outputs. Connect to
filtered +1.8V DC.
NOTE: If the LVDS clock outputs are not used, this pin should be tied to
ground.
29, 28
CLKOUT,
CLKOUT
CLOCK SIGNAL OUTPUT
Differential video clock output signal.
This is the lowest jitter output of the device.
See Section 3.7.1 for operation.
32
DIV_VDD
–
Power
Input
Positive power supply connection for the divider block. Connect to filtered
+1.8V DC.
33,34
VCO, VCO
Analog
Differential input for the external VCO reference signal. When using the
recommended VCO, leave VCO unconnected.
See Section 3.3.4 for operation.
35
VCO_GND
–
Power
Ground reference for the external voltage controlled oscillator. Connect to
pins 2, 4, 6, and 8 of the GO1555.
39145 - 3 November 2007
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GENNUM [ GENNUM CORPORATION ]
