ep2sgx30c Altera Corporation, ep2sgx30c Datasheet - Page 103

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

Figure 2–67. Global Clock Control Blocks
Notes to
(1)
(2)
Figure 2–68. Regional Clock Control Blocks
Notes to
(1)
(2)
Altera Corporation
October 2007
These clock select signals can be dynamically controlled through internal logic when the device is operating in user
mode.
These clock select signals can only be set through a configuration file (SRAM Object File [.sof] or Programmer Object
File [.pof]) and cannot be dynamically controlled during user mode operation.
These clock select signals can only be set through a configuration file (.sof or .pof) and cannot be dynamically
controlled during user mode operation.
Only the CLKn pins on the top and bottom of the device feed to regional clock select.
Figure
Figure
2–67:
2–68:
CLKSELECT[1..0]
(1)
This multiplexer supports
User-Controllable
Dynamic Switching
Figures 2–67
clock, regional clock, and PLL external clock output, respectively.
PLL Counter
PLL Counter
Outputs
Outputs
2
2
through
2
CLKp
CLKp
Pins
Pin
Enable/
Disable
RCLK
2
CLKn
Pin
2–69
Enable/
Disable
GCLK
CLKn
Pin
(2)
Internal
show the clock control block for the global
Logic
Static Clock Select (1)
Internal
Logic
Internal
Logic
Internal
Static Clock Select
Logic
Stratix II GX Device Handbook, Volume 1
(2)
Stratix II GX Architecture
2–95