HC4GX15 Datasheet, PDF (572/668 Pages) Altera Corporation – HardCopy IV Device Handbook

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Chapter 2: HardCopy IV GX Dynamic Reconfiguration
Description of Transceiver Channel Reconfiguration Modes
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 1.
■ You can reuse this .mif created for CMU0 PLL on CMU0 PLL of another
transceiver block if you want to reconfigure the CMU0 PLL of the other
transceiver block to exactly the same data rate information stored in the .mif.
■ If the logical reference index of the other CMU0 PLL is also the same as the
logical tx pll value stored in the .mif, you can write the same .mif without
using the logical_tx_pll_sel (set logical_tx_pll_sel_en to 1'b0).
You must set logical_channel_address to the logical channel address of
the transceiver channel associated to the other CMU0 PLL that you want to
reconfigure.
■ If the logical reference index of the other CMU0 PLL is different from the
logical tx pll value stored in the .mif, you must use the
logical_tx_pll_sel port. You must also set
logical_channel_address to the logical channel address of the transceiver
channel associated to the other CMU0 PLL you want to reconfigure.
■ By doing so, the dynamic reconfiguration controller overwrites the logical tx
pll value stored in the .mif with the logical reference index of the other CMU0
PLL.
■ The CMU0 PLL of the other transceiver block is reconfigured with the new data
rate information stored in the .mif.
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.
■ Assume that the logical reference index you assigned to CMU0 PLL is 0. The
.mif then contains the logical reference index of CMU0 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 CMU0 PLL.
■ If you want to reconfigure another transceiver channel of another transceiver
block to listen to its own CMU0 PLL, you can reuse this .mif.
■ If the logical reference index of the other CMU0 PLL is also the same as the
logical tx pll value stored in the .mif, you can write the same .mif without
using the logical_tx_pll_sel (set logical_tx_pll_sel_en to 1'b0).
You must set logical_channel_address to the logical channel address of
the transceiver channel associated to the other CMU0 PLL that you intend to
reconfigure.
■ If the logical reference index of the other CMU0 PLL is different from the
logical tx pll value stored in the .mif, you must use the
logical_tx_pll_sel port. Set logical_channel_address to the logical
channel address of the transceiver channel associated to the other CMU0 PLL
you intend to reconfigure.
HardCopy IV Device Handbook, Volume 3
© June 2009 Altera Corporation