Altera Clock Control Block IP Core - Manual (Page 11)

Chapter 2: Parameter Settings 2–5
Command Line Interface Parameters
February 2014 Altera Corporation Clock Control Block (ALTCLKCTRL) Megafunction
User Guide
Command Line Interface Parameters
Expert users can choose to instantiate and parameterize the megafunction through the
command-line interface using the clear box generator command. This method
requires you to have command-line scripting knowledge.
f
For more information about using the clear box generator, refer to the Introduction to
Megafunctions User Guide .
Table 2–2 lists the parameters for the ALTCLKCTRL megafunction.
Table 2–2. ALTCLKCTRL Megafunction Parameters
Parameter Name Type Required Comments
clock_type String Yes
This parameter specifies the operation mode. The values are:
The clkselect and ena ports are unavailable if the
clock_type
parameter is set to EXTCLK.
ena_register_mode String No
Register mode for the ena port. Values are NONE,
FALLING_EDGE, and DOUBLE_REGISTER. Only available in
Arria II GX, Arria II GZ, Arria V, Arria V GZ, Arria 10, Cyclone V,
Stratix III, Stratix IV, and Stratix V devices.
lpm_hint String No
Allows you to specify Altera-specific parameters in VHDL
Design Files (.vhd). The default value is UNUSED.
lpm_type String No
Identifies the library of parameterized modules (LPM) entity
name in VHDL Design Files (.vhd).
intended_device_family String No
Used for modeling and behavioral simulation purposes. Create
the ALTCLKCTRL megafunction with the MegaWizard Plug-In
Manager to get the value for this parameter.
implement_in_les String No
Specifies if you want the clock control unit to be implemented
using logic elements (LEs). Values are “ON” or “OFF”. The
default setting is “OFF”.
number_of_clocks Integer Yes
Specifies the number of global-type clock inputs. Values are
numeric type (1 to 4). For other clock types, only one clock
input is accepted.
use_glitch_free_switch_over
_implementation
String No
Specifies if you want to implement a glitch-free switchover
when you use multiple clock inputs. Values are “ON” and
“OFF”. If omitted, the default setting is “OFF”.
width_select Integer Yes
Specifies the width of the clock select when you use multiple
clock inputs. The clock select inputs dynamically selects the
clock source that drives the clock network. The values are 1 or
2. If omitted, the default value is 1, which means 1-bit width.
Value Signal Selection
AUTO Auto-selected clock
(default value)
GCLK Global clock
LCLK Regional clock
EXTCLK External clock
SIDE_CLK Dual-regional clock