ep2sgx30c Altera Corporation, ep2sgx30c Datasheet - Page 118

• Manufacturer Part Number: ep2sgx30c
• Description: Stratix Ii Gx Device Data Sheet
• Manufacturer: Altera Corporation

I/O Structure
Figure 2–75. Stratix II GX Device Fast PLL
Notes to
(1)
(2)
(3)
(4)
I/O Structure
2–110
Stratix II GX Device Handbook, Volume 1
Clock
Input
The global or regional clock input can be driven by an output from another PLL, a pin-driven dedicated global or
regional clock, or through a clock control block provided the clock control block is fed by an output from another
PLL or a pin-driven dedicated global or regional clock. An internally generated global signal cannot drive the PLL.
In high-speed differential I/O support mode, this high-speed PLL clock feeds the serializer/deserializer (SERDES)
circuitry. Stratix II GX devices only support one rate of data transfer per fast PLL in high-speed differential I/O
support mode.
This signal is a differential I/O SERDES control signal.
Stratix II GX fast PLLs only support manual clock switchover.
Figure
Global or
regional clock (1)
Global or
regional clock (1)
4
2–75:
f
Shaded Portions of the
PLL are Reconfigurable
Circuitry (4)
Switchover
Clock
Refer to the
of the Stratix II GX Device Handbook for more information on enhanced
and fast PLLs. Refer to
on page 2–136
support.
The Stratix II GX IOEs provide many features, including:
■
■
■
■
■
■
■
■
■
■
■
■
Dedicated differential and single-ended I/O buffers
3.3-V, 64-bit, 66-MHz PCI compliance
3.3-V, 64-bit, 133-MHz PCI-X 1.0 compliance
Joint Test Action Group (JTAG) boundary-scan test (BST) support
On-chip driver series termination
On-chip termination for differential standards
Programmable pull-up during configuration
Output drive strength control
Tri-state buffers
Bus-hold circuitry
Programmable pull-up resistors
Programmable input and output delays
÷n
Frequency
Detector
Phase
PFD
PLLs in Stratix II & Stratix II GX Devices
for more information on high-speed differential I/O
Charge
Pump
“High-Speed Differential I/O with DPA Support”
Loop
Filter
÷m
VCO
VCO Phase Selection
Selectable at each PLL
Output Port
÷k
8
chapter in volume 2
Post-Scale
Counters
÷c0
÷c1
÷c2
÷c3
Altera Corporation
October 2007
4
4
8
8
diffioclk0
load_en0
load_en1
diffioclk1
Global clocks
Regional clocks
to DPA block
(2)
(3)
(3)
(2)