
Virtex-II Platform FPGAs: DC and Switching Characteristics
R
DS031-3 (v3.5) November 5, 2007
Module 3 of 4
Product Specification
37
Output Clock Jitter
Output Clock Phase Alignment
Table 40: Output Clock Jitter
Description
Symbol
Constraints
Speed Grade
Units
-6
-5
-4
Clock Synthesis Period Jitter
CLK0
CLKOUT_PER_JITT_0
±100
ps
CLK90
CLKOUT_PER_JITT_90
±150
ps
CLK180
CLKOUT_PER_JITT_180
±150
ps
CLK270
CLKOUT_PER_JITT_270
±150
ps
CLK2X, CLK2X180
CLKOUT_PER_JITT_2X
±200
ps
CLKDV (integer division)
CLKOUT_PER_JITT_DV1
±150
ps
CLKDV (non-integer division)
CLKOUT_PER_JITT_DV2
±300
ps
CLKFX, CLKFX180
CLKOUT_PER_JITT_FX
Note 1
ps
Notes:
1.
Table 41: Output Clock Phase Alignment
Description
Symbol
Constraints
Speed Grade
Units
-6
-5
-4
Phase Offset Between CLKIN and CLKFB
CLKIN/CLKFB
CLKIN_CLKFB_PHASE
±50
ps
Phase Offset Between Any DCM Outputs
All CLK outputs
CLKOUT_PHASE
±140
ps
Duty Cycle Precision
DLL outputs(1)
CLKOUT_DUTY_CYCLE_DLL(2)
±150
ps
CLKFX outputs
CLKOUT_DUTY_CYCLE_FX
±100
ps
Notes:
1.
"DLL outputs" is used here to describe the outputs: CLK0, CLK90, CLK180, CLK270, CLK2X, CLK2X180, and CLKDV.
2.
CLKOUT_DUTY_CYCLE_DLL applies to the 1X clock outputs (CLK0, CLK90, CLK180, and CLK270) only if
DUTY_CYCLE_CORRECTION = TRUE.
3.
Specification also applies to PSCLK.