Altera Phase-Locked Loop Reconfiguration IP Core - Manual (Page 3)

Parameter Settings Page 3
Phase-Locked Loop Reconfiguration (ALTPLL_RECONFIG) Megafunction February 2012 Altera Corporation
Parameter Settings
Altera recommends that you configure the megafunction using the MegaWizard ™
Plug-In Manager. This section describes the parameters in the ALTPLL_RECONFIG
parameter editor.
Expert users may choose to instantiate and configure the megafunction using the clear
box generator.
Table 1 lists the parameter settings for the ALTPLL_RECONFIG megafunction.
Table 1. ALTPLL_RECONFIG Parameter Settings
Page Options Description
Parameter
Settings
Currently Selected
Device Family
Specifies the chosen device family.
Which scan chain
type will you be
using?
Scan chain is serial shift register chain that is used to store settings. It acts like a
cache. When you assert the reconfig signal, the PLL is reconfigured with the values
in the cache. The type of scan chain must follow the type of PLL to be reconfigured.
For Arria GX, Stratix II, Stratix II GX, and HardCopy II devices—Specifies the scan
chain type as either Enhanced or Fast.
For Stratix and Stratix GX devices—Specifies the scan chain type as either Long
chain or Short chain.
For Stratix III, Stratix IV, HardCopy III, and HardCopy IV devices—Specifies the
scan chain type as either Top/Bottom or Left/Right. For Cyclone III, Cyclone IV, and
Arria II GX devices—The scan chain type has a default value of Left/Right.
Do you want to
specify the initial
value of the scan
chain?
Specifies the initial value of the scan chain. Select No, leave it blank to not specify
a file or select Yes, use this file for the content data to browse for a .hex or .mif
file.
For Arria GX, Arria II GX, Stratix, Stratix GX, Stratix II, Stratix II GX,Stratix III,
Stratix IV, HardCopy II, HardCopy III, and HardCopy IV devices—You can also
choose to initialize from ROM by turning on Do not use pre-initialized RAM -
initialize from ROM instead.
For Cyclone III and Cyclone IV devices—The option to initialize from a ROM is not
available. However, you can choose to add ports to write to the scan chain from an
external ROM during runtime by turning on Add ports to write to the scan chain
from external ROM during run time.
Add ports to write
to the scan chain
from external
ROM during run
time
This option is only available for Stratix III, Stratix IV, Cyclone III, Cyclone IV,
HardCopy III, HardCopy IV, and Arria II GX devices. This option takes advantage of
cycling multiple configuration files, which are stored in external ROMs during user
mode. This capability is demonstrated in the functional description section,
“Functional Description—Implementing Multiple Reconfiguration Using an
External ROM” on page 6
.