Altera Stratix GX Transceiver - Manual (Page 185)

Altera Corporation 6–31
January 2005 Stratix GX Transceiver User Guide
GigE Mode
GigE Mode
MegaWizard This section describes the altgxb megafunction options for GigE mode.
Altera
® recommends that the Stratix GX transceiver block be instantiated
and parameterized through the altgxb MegaWizard Plug-In Manager in
the Quartus II software. The Quartus II MegaWizard Plug-In Manager
altgxb
-In offers a graphical user interface (GUI) that organizes the
altgxb options in easy-to-use sections. The MegaWizard Plug-In
Manager also sets the correct ports and parameters automatically, based
on the options and parameters you select. Invalid settings are
automatically flagged in the wizard to avoid illegal configurations. The
MegaWizard Plug-In also disables any options that do not apply to GigE
mode.
Although you can instantiate the Stratix GX block directly by calling out
the altgxb megafunction, Altera recommends that you use the
MegaWizard Plug-In Manager to instantiate your altgxb megafunction
to reduce the chance of invalid settings.
GigE Mode MegaWizard Considerations
Each altgxb MegaWizard instantiation can use one or more transceiver
blocks, based on the number of channels you select. There are four
channels per transceiver block. If a MegaWizard instantiation uses fewer
than four channels, the remaining channels in that transceiver block are
no longer available for use.
Each MegaWizard instantiation must have similar functionality and data
rates. If you wish to have transceiver blocks that differ in functionality or
data rates, you can create a separate MegaWizard instantiation for each
transceiver block.
Also, as mentioned in the clocking section, the MegaWizard displays the
configuration of the altgxb megafunction. This diagram changes
dynamically based on the selected mode, options, and clocking schemes.
GigE Mode altgxb MegaWizard Options
Figures 6–27 through 6–33 show the MegaWizard Plug-In Manager pages
where you select the options for a GigE mode configuration.