HC4GX15 Datasheet, PDF (561/668 Pages) Altera Corporation – HardCopy IV Device Handbook

Chapter 2: HardCopy IV GX Dynamic Reconfiguration
Description of Transceiver Channel Reconfiguration Modes
2–103
Blocks Reconfigured in the Channel Reconfiguration with TX PLL Select Mode
The block that gets reconfigured in this mode is the multiplexer, which selects the
output of one of the CMU PLLs and forwards it to the transceiver channel.
Figure 2–48 shows the multiplexer that you can dynamically reconfigure using the
Channel Reconfiguration with TX PLL select feature.
Figure 2–48. Channel Reconfiguration with TX PLL Select in a Transceiver Block
refclk0
refclk1
clock
mux
CMU Channels
CMU0 PLL
clock
mux
CMU1 PLL
full duplex transceiver channel
TX CHANNEL
Logical
TX PLL
select
LOCAL
DIVIDER
digital+analog logic
RX CHANNEL
clock
mux
RX PLL
digital+analog logic
Blocks that can be reconfigured in Channel Reconfiguration with TX PLL Select mode
ALTGX MegaWizard Plug-In Manager Setup for Channel Reconfiguration with TX PLL Select
Mode
To reconfigure the transceiver channel by selecting an alternate transmitter PLL
instead of the existing CMU PLL, you must set up the ALTGX MegaWizard Plug-In
Manager as shown in the following sections. The dynamic reconfiguration controller
reconfigures the multiplexer, selecting between the outputs of the two CMU PLLs
with the new information stored in the .mif.
In addition to the seven settings explained in “ALTGX MegaWizard Plug-In Manager
Setup for Channel and CMU PLL Reconfiguration Mode” on page 2–77, you must
also set up the following design aspect:
Main PLL and Alternate PLL
To reconfigure the CMU PLL during run time, you need the flexibility to select one of
the two CMU PLLs.
© June 2009 Altera Corporation
HardCopy IV Device Handbook, Volume 3