EP1C20F ALTERA [Altera Corporation], EP1C20F Datasheet - Page 36

• Manufacturer Part Number: EP1C20F
• Description: Cyclone FPGA Family
• Manufacturer: ALTERA [Altera Corporation]

Cyclone Device Handbook, Volume 1
Figure 2–22. Global Clock Generation
Notes to
(1)
(2)
(3)
2–30
Preliminary
CLK1 (3)
DPCLK1
DPCLK0
CLK0
The EP1C3 device in the 100-pin TQFP package has five DPCLK pins (DPCLK2, DPCLK3, DPCLK4, DPCLK6, and
DPCLK7).
EP1C3 devices only contain one PLL (PLL 1).
The EP1C3 device in the 100-pin TQFP package does not have dedicated clock pins CLK1 and CLK3.
Figure
2–22:
Cyclone Device
PLL1
The eight global clock lines in the global clock network drive throughout
the entire device. The global clock network can provide clocks for all
resources within the device—IOEs, LEs, and memory blocks. The global
clock lines can also be used for control signals, such as clock enables and
synchronous or asynchronous clears fed from the external pin, or DQS
signals for DDR SDRAM or FCRAM interfaces. Internal logic can also
drive the global clock network for internally generated global clocks and
asynchronous clears, clock enables, or other control signals with large
fanout.
network.
2
DPCLK2
DPCLK7
Figure 2–22
From logic
array
Note (1)
4
4
shows the various sources that drive the global clock
8
4
From logic
DPCLK6
array
4
DPCLK3
Global Clock
Network
2
PLL2
(2)
Altera Corporation
May 2008
DPCLK4
CLK2
CLK3 (3)
DPCLK5