HC4GX15 Datasheet, PDF (599/668 Pages) Altera Corporation – HardCopy IV Device Handbook

Chapter 2: HardCopy IV GX Dynamic Reconfiguration
Combining Transceiver Channels with Dynamic Reconfiguration Enabled
2–141
Requirements
When you enable dynamic reconfiguration, the Quartus II software has certain
requirements for combining multiple transceiver channels in the same physical
transceiver block:
■ All the channels that you want to combine into the same transceiver block must
have the same options enabled in the Reconfig screen of the ALTGX MegaWizard
Plug-In Manager. For example, when you enable the Analog controls (VOD,
Pre-emphasis, and Manual Equalization) option in the Reconfig screen of the
ALTGX MegaWizard Plug-In Manager for a channel, you need to enable the same
option for all the other channels to be combined.
■ All the channels must be controlled by the same ALTGX_RECONFIG (dynamic
reconfiguration controller) instance. The transceiver channels connected to
multiple ALTGX_RECONFIG instances cannot be combined into the same
physical transceiver block, even if they are configured to the same functional
mode and data rate.
1 The preceding two constraints are mandatory to combine transceiver channels into
the same transceiver block.
f
For additional requirements to combine the ALTGX instances within the same
transceiver block or in transceiver blocks on the same side of the device, refer to the
Configuring Multiple Protocols and Data Rates chapter in volume 2 of the Stratix IV
Device Handbook.
Combining a Transmitter Only Instance and Receiver Only Instance
Consider that you want to combine one Receiver only instance and another
Transmitter only instance in the same transceiver block:
■ The Receiver only instance must be controlled by an ALTGX_RECONFIG instance
for offset cancellation control.
■ Because you want to combine the Receiver only instance with another
Transmitter only instance into the same transceiver block, you must control the
Transmitter only instance using the same ALTGX_RECONFIG instance.
■ You must enable the same options in the Reconfig screen of the ALTGX
MegaWizard Plug-In Manager for both the Transmitter only and Receiver only
instances.
1 There are constraints with the independent Transmitter only and independent
Receiver only configurations. Both transmitter and receiver have to go through a reset
sequence, even if the transmitter or receiver is reconfigured.
Merging Transceiver Channels with Channel and CMU PLL Reconfiguration Mode
Enabled into the Same Transceiver Block
The Quartus II software requires the following Assignment Editor setting for all
channels assigned to the same transceiver bank when you enable the Channel and
CMU PLL reconfiguration option.
■ Assignment setting: Assignment Name - GXB TX PLL Reconfiguration group
setting (as shown in Figure 2–59).
© June 2009 Altera Corporation
HardCopy IV Device Handbook, Volume 3