ep1s25 Altera Corporation, ep1s25 Datasheet - Page 101

• Manufacturer Part Number: ep1s25
• Description: Stratix Device Family Data Sheet
• Manufacturer: Altera Corporation

Figure 2–52. Stratix Enhanced PLL
Notes to
(1)
(2)
(3)
(4)
Altera Corporation
July 2005
INCLK0
INCLK1
External feedback is available in PLLs 5 and 6.
This single-ended external output is available from the g0 counter for PLLs 11 and 12.
These four counters and external outputs are available in PLLs 5 and 6.
This connection is only available on EP1S40 and larger Stratix devices. For example, PLLs 5 and 11 are adjacent and
PLLs 6 and 12 are adjacent. The EP1S40 device in the 780-pin FineLine BGA package does not support PLLs 11
and 12.
Figure
Switch-Over
Circuitry
Clock
2–52:
FBIN
/n
(1)
Δt
Enhanced PLLs
Stratix devices contain up to four enhanced PLLs with advanced clock
management features.
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
Loop
Filter
/m
Figure 2–52
From Adjacent PLL
VCO
8
shows a diagram of the enhanced PLL.
Post-Scale
Counters
/g0
/g1
/g2
/g3
/e0
/e2
/e3
/e1
Stratix Device Handbook, Volume 1
/l0
/l1
Δt
Δt
Δt
Δt
Δt
Δt
Δt
Δt
Δt
Δt
Programmable
Time Delay on
Each PLL Port
4
4
Stratix Architecture
I/O buffers (2)
To I/O buffers or general
routing
Regional
Clocks
Global
Clocks
I/O Buffers (3)
2–87