HC4GX15 Datasheet, PDF (563/668 Pages) Altera Corporation – HardCopy IV Device Handbook

Chapter 2: HardCopy IV GX Dynamic Reconfiguration
Description of Transceiver Channel Reconfiguration Modes
2–105
CMU PLL Reconfiguration mode is also useful when used in combination with the
dynamic reconfiguration mode: Channel Reconfiguration with CMU PLL select.
Consider that you have one transceiver channel listening to one CMU PLL of the
transceiver block. You want to reconfigure the transceiver channel to a different data
rate.
■ You can first use CMU PLL Reconfiguration mode (set
reconfig_mode_sel[2:0] to 3’b100) and reconfigure the second unused CMU
PLL of the transceiver block to the desired data rate. For more information, refer to
“CMU PLL Reconfiguration Operation” on page 2–108.
■ You can then use Channel Reconfiguration with CMU PLL select mode (set
reconfig_mode_sel[2:0] to 3’b110) and reconfigure the transceiver channel
to listen to the second reconfigured CMU PLL. For more information, refer to
“Channel Reconfiguration with TX PLL Select: Operation” on page 2–106.
1 The main PLL corresponds to the CMU PLL configuration set in the General screen of
the ALTGX MegaWizard Plug-In Manager. The alternate PLL corresponds to the
CMU PLL configuration set in the Reconfig Alt PLL screen.
ALTGX_RECONFIG MegaWizard Plug-In Manager Setup for Channel Reconfiguration with
TX PLL Select Mode
The following sections describe the TX PLL selection operation in the ALTGX
MegaWizard Plug-In Manager.
In addition to the first six settings listed in “ALTGX_RECONFIG MegaWizard Plug-In
Manager Setup for Channel and CMU PLL Reconfiguration Mode” on page 2–101,
you must set up the following input ports that are available for selection in the
Channel and TX PLL Reconfiguration screen:
1. logical_tx_pll_sel and logical_tx_pll_sel_en—For more information
about these two ports, refer to “The logical_tx_pll_sel and logical_tx_pll_sel_en
Ports” on page 2–109.
The following input port is available for selection in the Error checks/Data rate
switch screen:
2. rx_tx_duplex_sel[1:0]—This signal informs the dynamic reconfiguration
controller if the targeted transceiver channel configuration is Receiver only,
Transmitter only, or Receiver and Transmitter. The .mif also contains information
about the transceiver channel configuration. The ALTGX_RECONFIG
MegaWizard Plug-In Manager asserts the error signal if there is a mismatch
between the rx_tx_duplex_sel [1:0] signal and the .mif contents. For more
information, refer to “Dynamic Reconfiguration Controller Port List” on
page 2–11.
© June 2009 Altera Corporation
HardCopy IV Device Handbook, Volume 3