ep1sgx25d Altera Corporation, ep1sgx25d Datasheet - Page 148

• Manufacturer Part Number: ep1sgx25d
• Description: Stratix Gx Device Family Data Sheet
• Manufacturer: Altera Corporation

PLLs & Clock Networks
Figure 4–51. Stratix GX Enhanced PLL
Notes to
(1)
(2)
(3)
4–82
Stratix GX Device Handbook, Volume 1
CLK0
CLK1
External feedback is available in PLLs 5 and 6.
This external output is available from the g0 counter for PLLs 11 and 12.
These counters and external outputs are available in PLLs 5 and 6.
Figure
Switch-Over
Circuitry
Clock
4–51:
FBIN
/n
(1)
Δt
Enhanced PLLs
Stratix GX devices contain up to four enhanced PLLs with advanced
clock management features.
enhanced PLL.
Phase Frequency
Detector
PFD
Charge
Pump
VCO Phase Selection
Selectable at Each
PLL Output Port
Lock Detect
& Filter
VCO Phase Selection
Affecting All Outputs
Spectrum
Δt
Spread
Filter
Loop
/m
From Adjacent PLL
VCO
Figure 4–51
8
Post-Scale
Counters
shows a diagram of the
/g0
/g1
/g2
/g3
/e0
/e1
/e2
/e3
/l0
/l1
Δt
Δt
Δt
Δt
Δt
Δt
Δt
Δt
Δt
Δt
Programmable
Time Delay on
Each PLL Port
4
4
Altera Corporation
February 2005
I/O Buffers (2)
to I/O or general
routing
Regional
Clocks
Global
Clocks
I/O Buffers (3)