HC4GX15 Datasheet, PDF (571/668 Pages) Altera Corporation – HardCopy IV Device Handbook

Chapter 2: HardCopy IV GX Dynamic Reconfiguration
Description of Transceiver Channel Reconfiguration Modes
2–113
For Channel and CMU PLL Reconfiguration and CMU PLL Reconfiguration Modes
■ Consider that you create a .mif containing the desired ALTGX settings to
reconfigure the CMU0 PLL. Assume that the logical reference index you
assigned to CMU0 PLL is 0.
■ You can reuse this .mif created for CMU0 PLL on CMU1 PLL of the same
transceiver block if you want to reconfigure CMU1 PLL to the new data rate
information stored in the .mif.
■ You must set logical_tx_pll_sel to 1'b1 and logical_tx_pll_sel_en
to 1'b1 and then write this .mif into the transceiver channel. By doing so, the
dynamic reconfiguration controller overwrites the logical tx pll value stored in
the .mif with the logical reference index of CMU1 PLL.
For Channel Reconfiguration with TX PLL Select Mode
■ Consider that you create a .mif containing the logical reference index of the TX
PLL that the reconfigured transceiver channel needs to listen to.
■ CMU1 PLL is reconfigured with the new data rate information stored in the
.mif.
■ Assume that the logical reference index you assigned to CMU1 PLL is 0. The
.mif then contains the logical reference index of CMU1 PLL as 0 (logic tx pll = 0).
■ When you use Channel Reconfiguration with TX PLL Select mode, and
reconfigure the transceiver channel with this .mif, the transceiver channel is
reconfigured to listen to CMU1 PLL.
■ If you want to reconfigure the transceiver channel to listen to CMU0 PLL
instead, you can reuse this .mif.
■ You must set logical_tx_pll_selto 1'b1 and logical_tx_pll_sel_en
to 1'b1 and then write this .mif into the transceiver channel. By doing so, the
dynamic reconfiguration controller overwrites the logical tx pll value stored in
the .mif with the logical reference index of CMU0 PLL.
■ The transceiver channel is reconfigured to listen to CMU0 PLL.
■ Condition 3: Reuse the .mif created for one CMU PLL on a CMU PLL of another
transceiver block.
The following section describes when to re-use the .mif generated for one CMU
PLL on a CMU PLL of another transceiver block during the various dynamic
reconfiguration modes.
© June 2009 Altera Corporation
HardCopy IV Device Handbook, Volume 3