Altera Stratix GX Transceiver - Manual (Page 105)

Altera Corporation 4–23
January 2005 Stratix GX Transceiver User Guide
SONET Mode
SONET Mode
MegaWizard
Plug-In Manager This section describes the altgxb megafunction options in the
MegaWizard Plug-In Manager for SONET mode. Altera recommends
that the Stratix GX transceiver block be instantiated and parameterized
through the altgxb megafunction in the MegaWizard Plug-In Manager.
The Quartus II MegaWizard Plug-In Manager offers a Graphical User
Interface (GUI) that organizes the altgxb options in easy to use sections.
The MegaWizard Plug-In Manager also sets the proper ports and
parameters automatically based on the selected options and parameters.
Invalid settings are automatically flagged in the MegaWizard Plug-In
Manager to help prevent illegal configurations. The MegaWizard Plug-In
Manager also grays out any options that do not apply to SONET mode.
Although you can instantiate the Stratix GX block directly by calling out
the altgxb megafunction, Altera recommends using the MegaWizard
Plug-In Manager to instantiate the altgxb megafunction to reduce the
chance of invalid settings.
SONET Mode MegaWizard Considerations
Each altgxb megafunction instantiation uses one or more transceiver
blocks based on the number of channels that you select. There are four
channels per transceiver block. If a MegaWizard Plug-In Manager
instantiation uses fewer than four channels, the remaining channels in
that transceiver block are not available for use.
Each MegaWizard Plug-In Manager instantiation must have similar
functionality and data rates. To have transceiver blocks that differ in
functionality and/or data rates, you can create a separate instantiation for
each transceiver block.
As mentioned in the clocking section, the MegaWizard Plug-In Manager
displays the configuration of the altgxb megafunction. This diagram
changes dynamically based on the selected mode, options, and clocking
schemes.
SONET Mode altgxb MegaWizard Options
Figures 4–17 through 4–22 show where you select the options for a
SONET mode configuration in the MegaWizard Plug-In Manager pages.