HC4GX15 Datasheet, PDF (533/668 Pages) Altera Corporation – HardCopy IV Device Handbook

Chapter 2: HardCopy IV GX Dynamic Reconfiguration
2–75
Description of Transceiver Channel Reconfiguration Modes
Functional Mode Reconfiguration
You can reconfigure the existing functional mode of the transceiver channel to a
totally different functional mode using this feature. The following are the various
ways you can reconfigure the existing functional mode:
■ You can switch only between one non-Basic (PMA Direct) configuration to another
non-Basic (PMA Direct) configuration
■ You can switch between one protocol configuration (for example, XAUI
configuration) to another protocol configuration (for example, GIGE
configuration)
■ You can switch between one protocol configuration (for example, Serial RapidIO
configuration) to a Basic configuration
■ You can switch between Basic configuration to another Basic functional mode
You cannot dynamically reconfigure the following:
■ You cannot switch from a CEI configuration to any other functional mode
■ You cannot switch between Basic (PMA Direct) ×1 configuration to Basic (PMA
Direct) ×1 configuration
■ You cannot switch between Basic (PMA Direct) ×N configuration to Basic (PMA
Direct) ×N configuration
■ You cannot switch from a bonded mode configuration (for example: PCI Express
[PIPE] ×4 configuration) to any other functional mode
There is no limit to the number of functional modes you can reconfigure the
transceiver channel to, if the various clocks involved support the transition. For more
information about core clocks, refer to “Core Clocking Setup” on page 2–79.
1 In addition to the categories mentioned, you can also choose to reconfigure both the
data rate and functional mode of a transceiver channel.
1 For the following sections, assume that the transceiver channel has the Receiver and
Transmitter configuration in the ALTGX MegaWizard Plug-In Manager, unless
specified as Transmitter only or Receiver only.
Blocks Reconfigured in Channel and CMU PLL Reconfiguration Mode
The blocks that get reconfigured by this dynamic reconfiguration mode are the PCS
and PMA blocks of a transceiver channel, local divider settings of the transmitter and
receiver channel, and the CMU PLL.
© June 2009 Altera Corporation
HardCopy IV Device Handbook, Volume 3