HC4GX15 Datasheet, PDF (532/668 Pages) Altera Corporation – HardCopy IV Device Handbook

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Chapter 2: HardCopy IV GX Dynamic Reconfiguration
Description of Transceiver Channel Reconfiguration Modes
Channel and CMU PLL Reconfiguration Mode
You can reconfigure a transceiver channel to a different functional mode and data rate
by using this dynamic reconfiguration mode. To reconfigure a channel successfully,
select the appropriate options in the ALTGX MegaWizard Plug-In Manager (described
in the following sections), and generate a .mif. The ALTGX_RECONFIG instance
reconfigures the transceiver channel by writing the .mif contents into the channel.
1 Channel and CMU PLL Reconfiguration mode only affects the channel involved in
the reconfiguration (the transceiver channel specified by the
logical_channel_address port), without affecting the remaining transceiver
channels controlled by the dynamic reconfiguration controller.
1 Channel and CMU PLL Reconfiguration mode is applicable to the regular transceiver
channels configured in non Basic (PMA Direct) mode only.
1 Channel and CMU PLL Reconfiguration mode is not applicable to the following:
■ Regular transceiver channels configured in Basic (PMA Direct) ×1 and ×N
configurations
■ CMU channels configured in Basic (PMA Direct) ×1 and ×N configurations
■ Regular transceiver channels configured in bonded configurations
■ Regular transceiver channels configured in CEI configuration
Channel and CMU PLL Reconfiguration mode can be classified as follows:
■ Data rate reconfiguration
■ Functional mode reconfiguration
■ Data rate and functional mode reconfiguration
Data Rate Reconfiguration
■ You can reconfigure the data rate of the transceiver channel by reconfiguring the
CMU PLL connected to the transceiver channel.
■ You can reconfigure the data rate of the transceiver channel by selecting another
transmitter PLL to supply clocks to the transceiver channel.
■ Every transmitter channel has one local clock divider. Similarly, every receiver
channel has one local clock divider. You can reconfigure the data rate of a
transceiver channel by reconfiguring these local clock dividers to 1, 2, or 4. When
you reconfigure these local clock dividers, ensure that the functional mode of the
transceiver channel supports the reconfigured data rate.
HardCopy IV Device Handbook, Volume 3
© June 2009 Altera Corporation